Network

Parallel Computing

2010-12-27T16:39:00.002+07:00

What is the Parallel Computing?

With the Parallel Computing it is possible to subdivide a program in more processes that work on different processors and that they exchange data in cooperation. In this way the resources of memory and ability to calculation can be taken advantage of parallel more computer, optimizing and diminishing in drastic way the times of execution of the programs.

What is the cluster of computer?

A cluster of computer it is constituted from a group of computer, interconnected with a fast net, whose nodes are characterized by powerful and equipped CPU of much memory RAM. Therefore through an operating system (of Linux type) and with specific software used for the programming parallel they come from each other interconnected in order to form a supercomputer. The main advantages of the cluster of computer regarding the supercomputers trade them are:

o Economization: from 5 to 10 more economic times regarding the workstation and to the supercomputers it trades them.

o Reliability and easy maintenance: a cluster can be always maintained with easy available hardware on the market of the PC, and in the same way can be repaired.

o Platform standard: Several of the software used for the parallel computing and the library used to prepare the cluster is same of commercial workstation. o Open Source software: It has therefore all the advantages deriving from available, and programmable software, that is completely extremely reliable according with the philosophy of open source liberations, continuously supported.

Speed and power for the scientific calculation

Typically the numerical simulations demand remarkable resources of calculation and of memory and often, in spite of the technology it evolves quickly so, a single computer can not be sufficient. Then it has been forced to simplify the model of the simulation in several ways, according to the limitations of the calculation resources that are had on hand. Cluster of computer and the parallel computing comes encounter to these requirements and concurs of make fast those simulations that demand excessive times on a single computer. Moreover they make available a more powerful and flexible architecture, in a position to adapting own calculation abilities and of memory to the requirements of the single application.

The cluster: An issue of costs

The cluster of computer is a relatively recent technology, that it means to apply the typical solutions of the supercomputers using common hardware, pulling down the costs remarkably. The task to carry out on the parallel machine comes left again between the several units of calculation, and the communication between the processors happens through a local net. A cluster a machine is to all the effects parallel and can be programmed with the same techniques of the supercomputers. The advantage that comes offered is the extreme convenience of the members hardware, that they render the cluster able to more obtain great performances to contained costs. To this we can add the remarkable flexibility, that it allows to realize cluster that they go from little computers until to hundred of unit in a position to competing with the supercomputers parallels of you wrap average. To parity of performances with the supercomputers, the cluster they can catch up relationships of price from 5 to 10 inferior times. Parallel computing can be considered an evolution of serial computing that attempts to emulate many complex, interrelated events happening at the same time like:

Tectonic plate drift

Weather and ocean patterns

Industrial assembly line

Daily operations within a business

Planetary and galactic orbits

Parallel Programming

2010-12-27T16:36:00.001+07:00

Cloud computing and multicore chips have a similar problem. There just aren't enough programmers out there who know how to do parallel programming.

Frankly, it's a bit of a chicken-and-egg problem. Why use multicore chips or move to parallel computing when you don't have anyone who can design the applications to take advantage of their strengths? And if the technologies aren't used, why bother learning parallel programming?

That's exactly why it's good news that IBM and Google are teaming up to promote parallel programming at six U.S. universities.

According to a recent InfoWorld article, parallel programming requires you to examine tasks and break them into hundreds to thousands of smaller pieces, which then will run on various servers at the same time. Michael Suess, a researcher associate at the University of Kassel who writes the blog Thinking Parallel, said it best in a recent blog post on the topic:

The very first step in every successful parallelization effort is always the same: you take a look at the problem that needs to be solved and start splitting it into tasks that can be computed in parallel. This sounds easy, but I can see from my students reactions that at least for some of them it is not.

I'll have to take his word on it, and - from what I've read about the shortage of parallel programmers - so will you. Currently, there's not a lot of demand for cloud computing - or multicore chips, for that matter. But there will be, particularly online, where experts say parallel computing could help speed up interactive Web 2.0 applications. It's also expected to be huge in mobile computing. So, you can sort of see why Google and IBM would be interested in promoting parallel programming. And why, according to the BBC report, they've invested more than $30 million in the project, which involves building data centers capable of holding 1,600 computers.

So far, Carnegie Mellon, MIT, Stanford University, the University of California at Berkeley, the University of Maryland and the University of Washington have signed on for the project.

What is PGP Encryption?

2010-12-23T22:14:00.001+07:00

PGP Encryption

Despite its humorous name, Pretty Good Privacy (PGP) encryption is quite a heavyweight in the cryptology industry. And although it stands alongside the heavy encryption used in government communications, PGP encryption is used commercially by most email providers.

Created by Phillip Zimmerman in 1991, it follows the Open PGP standard for the encryption and decryption of data. Using public-key cryptography and a specific system created by Zimmerman for the binding to a username or email address, encrypted data can be sent securely through the Internet and decrypted when it reaches its destination.

Public-key cryptography is perhaps the reason why PGP encryption is such a success. Here is how it works; let's say an email is being delivered through the Internet, when it is sent, the message is encrypted into a random jumble of letters and numbers that won't make sense. It is now a code. And for every code, you'll need a key that can unlock the message and convert it back to its original form. So, even if you somehow intercept the email before it reaches its destination, all you will see are lines of nonsense. However, for the recipient, the password will be able to act as a key and decrypt the code.

A simple analogy is a mailbox in front of your house. Its location isn't exactly a secret. You can only put letters into the slot, but you cannot unlock it without the key. A similar principle applies for public-key cryptography.

As an extra security measure, PGP encryption includes a digital signature support. This allows the authentication of messages and integrity checking. Using RSA or DSA signature algorithms, the sender can electronically 'sign' documents which can then be sent through email. Once it reaches its destination, the signature will be checked by the appropriate software, which compares it to a sample of your own signature. Once it matches, the document is considered legal and can be used in a court of law.

And although public-key cryptography and digital signatures may seem enough for most people, it isn't to Zimmerman. When someone encrypts and sends a message to another public-key (username or email), it is important that the public-key actually exists and belongs to someone. Since most documents that have PGP encryption are mostly confidential, it would be bad if it ends up in the wrong hands. So, to overcome this problem, another feature is added, the 'web of trust', which is exactly what is sounds like.

PGP Encryption

It basically points out an error when you're sending a message to a public-key that doesn't exist. This is achieved by the identity certificate that is made available when you download the public-key. This 'certificate' only allows the sender to send to one specific public-key and prevent any you from typing out the wrong email address.

PGP encryption is the best way to ensure your data's security due to its high quality. In fact, PGP encrypted data is so hard to be decoded that a leading cryptographer, Bruce Schneier once called it the 'closest thing you can get to a military-grade encryption'.

History of Encryption and Ciphers

2010-12-23T22:09:00.002+07:00

History of Encryption and Ciphers

Carrying messages across enemy lines, setting up midnight rendezvous, or secret attacks all have been strengthened by using secret codes. Ciphers and codes have been used since ancient times in many different shapes and forms to protect messages from being intercepted. Ciphers and codes have even crept into many popular mediums from Harry Potter books to the hit movie and book, The Da Vinci Code. (1).

Today, we still see ciphers in the form of encryption. Encryption is the ability to render a message unreadable without special knowledge to decrypt it. It's everywhere, from encrypted government secrets to emails sent around the office; the use of encryption has become a part of everyday life.

Ciphers and Codes

Though ciphers and codes are often thought to be the same they are, in fact, two separate methods for disguising communication data.

Codes provide exchanges for pictures, words, or numbers for words or phrases and will only have a set amount of words or phrases that can be decoded.

Ciphers exchange individual letters for other letters or numbers breaking down messages to a far greater degree (1). a

Ciphers also have the advantage of being able to be shifted very quickly since instead of having a set number of phrases or words in a code it uses an algorithm to define any possible word or phrase.

Through the complex and systematic nature of ciphers, which are used over codes for encryption. By looking at the history of ciphers we can get a better understanding of how and why encryption works in today's world.

Atbash - A Basic Cipher

Early religion provided us with some of the most basic ciphers we know about. Judaism brought forth the Atbash. Atbash is a "substitution cipher", which means that every letter is exchanged for another in the alphabet. In this case, it's the first letter of the alphabet for the last. While this is very basic, most people couldn't read let alone break codes at 600BC.

When in Rome, Keep Secrets: The Caesar Shift

Ancient Rome and famed emperor Julius Caesar carried ciphers to new level. Caesar used a cipher as a means to carry commands to his generals and allies. Using what would be later dubbed "Caesar shift", he made his messages unreadable to those who didn't have the shift sequence.

Another form of substitution cipher the method was to simply shift the letter wanted by three later for example, A > D, B >E and C >F. If a message said "spy" would look like this in the Caesar Shift:

S > V, P >S and Y >B. vsb

The phrase "ad astra," shoot for the stars would translate to "DG DVWUD" in the Caesar Shift

It was quickly adapted to be any variable amount of places in the shift.

History of Encryption and Ciphers

Rot13 - A Cipher Novelty

ROT13 sounds like something Hermione Granger uses on her O.W.L.s.(2) , but is a variation of the Caesar Shift, it uses a 13 letter/character replacement sequence. Rot13 is still used often today, though more as novelty than keeping any secrets.

Message boards that reveal the ending of a book or movie have used the Rot13 method to protect others from accidentally reading spoilers. Harry Potter fans, you may just find out what "he who must not be named" means to do to young Mr. Potter in book seven, the Deathly Hallows.

Modern Encryption

The advent of the computer revolutionized the world of codes. All of the ciphers above could be cracked with computer programs in a matter of seconds with the right software. Both the building and breaking of stronger ciphers have been blazing along as technology provides new tools that have forever changed cryptography. Modern uses of ciphers have led to advanced computer technology that is known as encryption.

One method of encryption is Public Key Encryption (PKE). The PKE cipher is radically stronger than those used in ancient times. Imagine two prime numbers (a number that can only be divided by one and itself) for example 17 and 13. When you multiply these two numbers you come up with 221, and is known as the modulus.

To an outsider, 221 would have no meaning since there are plenty of factors that could be broken down. There also needs to be a random number that has a value somewhere between 1 and the product of the two prime numbers. In a PKE cipher, a formula is made where the a variable will be sought out:

Prime#1 * Prime#2= A

Random# must be between 1 and A

Solution Must be a whole Number

(X * random# )-1 = (Prime#1-1) * (Prime#2-1)

X will be the private key used for the encryption and the two prime numbers will be the public key given out. As you can see, if PKE is Superman, Atbash is an amoeba.

To find each number's code you would take the value of a number (A=1 and... Z=26) and raise it to the power of the random number used earlier. After that each number is figured out using a system called "modular arithmetic" (3) .

If all this sounds confusing don't worry that's the point of cipher! The prime numbers used in software encryptions are hundreds of digits long. Making it dramatically more secure and difficult for someone to try and discover how the code can be broken. It would take the Bat computer, Professor Dumbledore and a legion of Scooby's to break a PKE cipher.

For encrypting computer files, the same process occurs where the file is broken up into sections of bits. The smaller the number of bits per section, the stronger the level of encryption will be. Instead of letters being converted it is 0 and 1 of binary.

Evolution of Encryption: Email Anti-Theft, Locking Down Your Email

Not only has the strength of encryption increased by leaps and bounds with computer speeds, but it has become used in everyday actions. Email Anti-Theft software can allow individuals who know nothing about encryption to apply heavy protection settings to outbound email files with the same ease as an unencrypted email. Email anti-theft technology allows a system where there's no manual key exchange, yet the outbound email files don't lose any encryption strength when sent outside your company.

Importance of Encryption

Computers aren't the expensive and slow behemoths they were in the 1970s, 1980s and 1990s. Today the even the most affordable PC is able to store countless files and run thousands of scenarios a minute. To protect private information the encryptions has to be strong enough to endure computerized attacks.

A weak cipher can have its algorithm discovered and deciphered quickly; where as strong encryption could withstand almost any length of deciphering assaults (4) . While you may not be sending commands to you armies in the east, your email messages, banking documents and other private bits of data still deserve the highest level of security.

Send Encrypted Files to Other PCs

2010-12-23T22:02:00.003+07:00

Send Encrypted Files

Once the file is encrypted, the file has been automatically locked and can not be opened by any user. If by chance you want to send a file that is encrypted, automatically you have to export your personal encryption certificate from the home PC and then import it into another PC.

Here's how to export your certificate:

1. Click [Start]> [Control Panel]> [Network and Internet]> [Internet Options] to open Internet Options.

2. In the Internet Options window, click the [Content].

3. In the Certificates section, click the [Certificates] then select your encryption key and select the [Export ...].

4. In the wizard that appears, click Next, then select [Yes export the private key] and click [Next] again.

5. Give a check mark in all the options available, then click [Next].

6. Enter a password for the certificate and click [Next] again.

7. This time, specify the location and filename of the certificate in the field File name. Surely you must click on [Next] again to continue.

8. Click [Finish] to start the certificate export process.

Send Encrypted Files

After the certificate so, move them to another computer. On another computer, do the following:

9 Repeat steps 1 through 3. Only this time click the Import button. The Certificate Import Wizard will appear. Click [Next] to continue.

10 Indicate the location of the certificate file that you exported earlier and click [Next].

11 Enter the password you specified when you export them and then click [Next].

12 Click [Place All Certificates In The Following Store] then click [Browse] to open a dialog box The Select Certificate Store. Select the [Personal] and click [OK].

13 Click [Next] and then click [Finish].

Encryption Technology

2010-12-21T21:53:00.002+07:00

Encryption Technology

Too many hackers are out there and that's why data over the network is no longer secure but encryption technology makes it secure to safeguard important financial and business information. So, let's understand what it means and how it works as secure channels over which data can travel smoothly even through insecure networks. This way, you will understand how to use encryption technology without spending a fortune.

Encryption Technology - What It Means

Encryption is mainly an effective information scrambling technique to secure data. Be it an email you send or an online chat you engage in, encryption technology breaks up the whole data. The data gets transformed into thousands and thousands of symbols, letters, and numerals.

This way, your personal data gets safely stored in the hard disk, email or other online services. This also safeguards your identity, personal information and even protects your details when you buy something through the Internet.

Types of Data Encryption Technology

Data encryption comprises software which involves mathematical algorithms which break information into scrambled text. This text is called as encrypted text or cipher text. To understand it simply, a numeric string is attached to the information during encryption. This string can be as big as 128 bits.

The resulting encrypted text can be unlocked only by the person who has the corresponding key or the password. When an authorized user unlocks the text, the process is called as deciphering or decryption. Simply put, this means that the person with the right 'software' key would be able to unlock the encrypted information.

Two different types of data encryption are used to secure the network. These are known as private-key and public-key encryption. The private-key encryption is used by individuals for personal use. In this method, a single key is available to both the sender and the receiver.

In the public-key encryption method, a pair of keys are used. One of the keys would be known to many people but the second key would be kept as a secret. A perfect combination of this pair of keys alone would allow a person to have access to the secured data.

Think about your own email ID to understand this better. A host company provides you with the ID, which is the known key. However, it is your password that enables you to gain access to the mail account, which means the password is your secret key.

SSL Encryption for Online Transactions

The SSL or Secure Sockets Layer is an effective encryption technology for online entities that handle transactions which comprises stores, banks, and other Internet based businesses. So, they require a stronger encryption mode.

The SSL encryption safeguards those electronic pipelines which connect your Web browser to the computers that host the e-commerce Web sites. Usually, those sites that use this encryption technology will feature a tiny padlock icon on the address window or be displayed somewhere on the screen. This is to let you know that it is safe to type in details such as your password or credit card number.

Proxy Ports And Protocols

2010-12-21T21:47:00.002+07:00

Whenever a computer receives or transmits information, be it a home computer or a server, it does so through an open port that at some point connects to a router, which will then send the information over the internet. Depending on the type of data being processed, certain specific ports are used.

In proxy servers, there are several ports that are most commonly used. These protocols communicate with external devices, such as routers, by means of a protocol. Protocols are used in order to allow equipment to communicate with each other and establish how information is sent over the internet.

The most common protocol used by proxy ports is TCP - Transmission Control Protocol. TCP is an essential part of any TCP/IP network. While the IP - Internet Protocol - deals with the packets of data that is being transmitted, TCP is in charge of guaranteeing that these packets will be delivered and that they will arrive at their destination in the same order that they were sent through a specific port. Some ports use another type of protocol, which is UDP. Although UDP also establishes communication between ports, is does not guarantee it.

Other commonly used protocols are:

o HTTP - establishes the format in which web browsers and internet sites communicate with each other

o FTP - establishes formats for file transfers

o IMAP - determines communication between e-mail servers and their clients

o SSL Protocol - determines formats used for encrypted communication

The most commonly used proxy ports are:

TCP Port 80

Protocol / Name: WANRemote

Description: Standard web service port. When transferring sensitive data, port 443 is recommended as this is a vulnerable Trojan port. It should be tested to identify vulnerabilities if used, either through spyware removal programs or firewalls.

TCP Port 8000

Protocol / Name: iRDMI

Description: Not a Trojan port.

TCP Port 8080

Protocol / Name: http-alt

Description: An HTTP alternative port. It is a vulnerable Trojan port and should be tested to identify vulnerabilities if used, either through spyware removal programs or firewalls.

TCP Port 8081

Protocol / Name: blackice-logon

Description: Network Admin port for BlackIce's intrusion detection program through its host-based firewall.

TCP Port 443

Protocol / Name: https

Description: A secure port which uses HTTP over SSL. Information sent through this port is encrypted via the SSL protocol.

TCP Port 444

Protocol / Name: snpp

Description: Uses Simple Network Paging Protocol for data transfers.

TCP Port 1080

Protocol / Name: socks

Description: A SOCKS port used for outbound TCP services, such as FTP and HTTP. As with port 80 and 8080, it is vulnerable to attacks. Attackers that connect to this port can bounce off to reach other internal hosts that are otherwise protected from direct attacks. Port scans should be made in order to listen for attempts of connection to this port.

TCP Port 2301

Protocol / Name: Cpq-wbem

Description: Compaq HTTP port.

TCP Port 3128

Protocol / Name: ReverseWWWTunnel

Description: Reverse WWW Tunnel Backdoor port.

TCP Port 3382

Protocol / Name: fujitsu-neat

Description: Fujitsu Net Enhanced Antitheft port.

Encryption

2010-12-21T21:32:00.003+07:00

Encryption

Encryption is a method of compressing data files into a format inaccessible to unauthorized people. Technology used in encryption activities was once used exclusively by top-secret military and government operations. Now, even ordinary people can use encryption software to ward off a different kind of spy--hackers that steal identities and spread viruses.

Company executives are often advised to use encryption when transmitting sensitive data over the Internet. E-mail must be protected from possible corporate saboteurs. Most E-mail service providers provide an additional encryption feature.

Encrypting emails can be as easy as clicking an icon on the menu bar. Even IT hubs like cafés, hotels, and offices have networks that use encryption systems to protect users from hackers in addition to other security tools like virus scanners and firewalls.

WLAN or wireless local area network users or those that access the Internet through wireless connectivity are often advised to use encryption methods to keep their hard drives, folders, and transactions off limits to people with malicious intent. Protection is always key when accessing the Internet.

Encryption has many levels of sophistication and formidability against attacks. The kind of encryption you can use depends on your software and your technological know-how in implementing encryption. Decryption or the process of deciphering encrypted messages or data is also a part of the encryption system. In this world of wireless connectivity, it is hard to tell who is eavesdropping and stealing your most confidential information. Better be armed against them. This is not to say that encrypted messages are always safe from hackers. The best of the lot may be able to get past the password-protected protocol, even with the best encryption software. But at least these tools can slow down hackers, and the inconvenience alone may deter them from their devious pursuits.

Overview of an Intranet Security System

2010-12-18T20:01:00.001+07:00

Any intranet is vulnerable to attack by people intent on destruction or on stealing corporate data. The open nature of the Internet and TCP/IP protocols expose a corporation to attack. Intranets require a variety of security measures, including hardware and software combinations that provide control of traffic; encryption and passwords to validate users; and software tools to prevent and cure viruses, block objectionable sites, and monitor traffic.

The generic term for a line of defense against intruders is a firewall. A firewall is a hardware/software combination that controls the type of services allowed to or from the intranet.

Proxy servers are another common tool used in building a firewall. A proxy server allows system administrators to track all traffic coming in and out of an intranet.

A bastion server firewall is configured to withstand and prevent unauthorized access or services. It is typically segmented from the rest of the intranet in its own subnet or perimeter network. In this way, if the server is broken into, the rest of the intranet won't be compromised.

Server-based virus-checking software can check every file coming into the intranet to make sure that it's virus-free.

Authentication systems are an important part of any intranet security scheme. Authentication systems are used to ensure that anyone trying to log into the intranet or any of its resources is the person they claim to be. Authentication systems typically use user names, passwords, and encryption systems.

Server-based site-blocking software can bar people on an intranet from getting objectionable material. Monitoring software tracks where people have gone and what services they have used, such as HTTP for Web access.

One way of ensuring that the wrong people or erroneous data can't get into the intranet is to use a filtering router. This is a special kind of router that examines the IP address and header information in every packet coming into the network, and allows in only those packets that have addresses or other data, like e-mail, that the system administrator has decided should be allowed into the intranet.

All intranets are vulnerable to attack. Their underlying TCP/IP architecture is identical to that of the Internet. Since the Internet was built for maximum openness and communication, there are countless techniques that can be used to attack intranets. Attacks can involve the theft of vital company information and even cash. Attacks can destroy or deny a company's computing resources and services. Attackers can break in or pose as a company employee to use the company's intranet resources.

Firewalls are hardware and software combinations that block intruders from access to an intranet while still allowing people on the intranet to access the resources of the Internet. Depending on how secure a site needs to be, and on how much time, money, and resources can be spent on a firewall, there are many kinds that can be built. Most of them, though, are built using only a few elements. Servers and routers are the primary components of firewalls.

Most firewalls use some kind of packet filtering. In packet filtering, a screening router or filtering router looks at every packet of data traveling between an intranet and the Internet.

Proxy servers on an intranet are used when someone from the intranet wants to access a server on the Internet. A request from the user's computer is sent to the proxy server instead of directly to the Internet. The proxy server contacts the server on the Internet, receives the information from the Internet, and then sends the information to the requester on the intranet. By acting as a go-between like this, proxy servers can filter traffic and maintain security as well as log all traffic between the Internet and the network.

Bastion hosts are heavily fortified servers that handle all incoming requests from the Internet, such as FTP requests. A single bastion host handling incoming requests makes it easier to maintain security and track attacks. In the event of a break in, only that single host has been compromised, instead of the entire network. In some firewalls, multiple bastion hosts can be used, one for each different kind of intranet service request.

Ethernet

2010-12-18T19:56:00.001+07:00

Ethernet Technology - Understanding Ethernet Technology

The Ethernet technology is the oldest yet mostly used for networking until the present day. Ethernet's existence began when PARC or Palo Alto Research Center Inc. (then known as XEROX PARC) thought about creating a coaxial cable connection system that comprises of various computers and technological devices.

Three years later, a partial draft version was finished and prepared for testing. It was announced successful not only because a connection between two computers were made, but also because data transfer fruitfully took place with the speed of 3 megabytes per second.

The term Ethernet was formed by putting words Ether and Net together. Ether was picked because of the use of Fiber Optics, where light is the medium of data transportation. Net is an abbreviation for network, the community of link computers. With its promising action of making computer connectivities possible, Ethernet later on gave life to what we now know as Local Area Networks (LANs).

Ethernet works by linking computers and other devices through cables. One end of these cables is connected to the computer, and the other is to a connector. These connectors could be Repeaters, Hubs or Switches. Connectors, such as the three, are grouped according to how they do their role in the system. Ethernet applies the cause-and-effect approach.

Firstly, a computer will summon a signal where it embeds a message. With the help of cables, the signal travels from its origin to the connector and then from the connector to the accepting computer. When the assigned computer catches the signal, it will transmit its own back to the sender and react according to the prompted information.

In a standard network, all connected computers have exactly the same boundaries. But in more complex and larger networks, there are usually one or two computers that are in control of the interactions of the entire network.

In the present, the Ethernet technology is available in many versions. The earliest ones are the 10BASE5 (the very first standard), 10BROAD36 (the first standard that allowed long-distance connections), 10BASE2 (also known as the Cheapernet) and 1BASE5 (said to be a failure but started the following developments in Ethernet technology).

The more modernized generation of the technology came with different speed performances. The 10 megabit Ethernet was the first to step out of the previous 1Mbit/second rating. And then the Fast Ethernet, which upholds the rate of 100Mbit per second, dethroned the previous by executing ten times higher.

And then the Gigabit Ethernet was born, priding itself with an even more edgy speed of 1 gigabyte per second data transmission. The Gigabit Ethernet soon opened doors for the 10 Gigabit Ethernet, the variant that surpassed its already-powerful precedent. And today, the public is only waiting for newer versions 40 and 100 Gigabit to be released.

It is hard to imagine where we would be now without the presence of networking technologies such as the Ethernet. Even the simplest of daily actions would be very bothersome when networking automation is erased. And so, we would always have to be thankful that Ethernet was formalized and born into our world.

How the OSI Model Works

2010-12-18T19:54:00.002+07:00

A group called the International Standards Organization (ISO) has put together the Open Systems Interconnect (OSI) Reference Model, which is a model that describes seven layers of protocols for computer communications. These layers don't know or care what is on adjacent layers. Each layer, essentially, only sees the reciprocal layer on the other side. The sending application layer sees and talks to the application layer on the destination side. That conversation takes place irrespective of, for example, what structure exists at the physical layer, such as Ethernet or Token Ring. TCP combines the OSI model's application, presentation, and session layers into one which is also called the application layer.

The application layer refers to application interfaces, not programs like word processing. MHS (Message Handling Service) is such an interface and it operates at this level of the OSI model. Again, this segmentation and interface approach means that a variety of email programs can be used on an intranet so long as they conform to the MHS standard at this application interface level.

The presentation layer typically simply provides a standard interface between the application layer and the network layers. This type of segmentation allows for the great flexibility of the OSI model since applications can vary endlessly, but, as long as the results conform to this standard interface, the applications need not be concerned with any of the other layers.

The session layer allows for the communication between sender and destination. These conversations avoid confusion by speaking in turn. A token is passed to control and to indicate which side is allowed to speak. This layer executes transactions, like saving a file. If something prevents it from completing the save, the session layer, which has a record of the original state, returns to the original state rather than allowing a corrupt or incomplete transaction to occur.

The transport layer segments the data into acceptable packet sizes and is responsible for data integrity of packet segments. There are several levels of service that can be implemented at this layer, including segmenting and reassembly, error recovery, flow control, and others.

The IP wrapper is put around the packet at the network or Internet layer. The header includes the source and destination addresses, the sequence order, and other data necessary for correct routing and rebuilding at the destination.

The data-link layer frames the packets-for example, for use with the PPP (Point to Point). It also includes the logical link portion of the MAC sublayer of the IEEE 802.2, 802.3 and other standards.

Ethernet and Token Ring are the two most common physical layer protocols. They function at the MAC (Media Access Control) level and move the data over the cables based on the physical address on each NIC (Network Interface Card). The physical layer includes the physical components of the IEEE 802.3 and other specifications.

How TCP/IP and IPX Work on Intranets

2010-12-18T19:51:00.001+07:00

What distinguishes an intranet from any other kind of private network is that it is based on TCP/IP-the same protocols that apply to the Internet. TCP/IP refers to two protocols that work together to deliver data: the Transmission Control Protocol (TCP) and the Internet Protocol (IP). When you send information across an intranet, the data is broken into small packets. The packets are sent independently through a series of switches called routers. Once all the packets arrive at their destination, they are recombined into their original form. The Transmission Control Protocol breaks the data into packets and recombines them on the receiving end. The Internet Protocol handles the routing of the data and makes sure it gets sent to the proper destination.

In some companies, there may be a mix of TCP/IP-based intranets and networks based on other networking technology, such as NetWare. In that instance, the TCP/IP technology of an intranet can be used to send data between NetWare or other networks, using a technique called IP tunneling. In this instance, we'll look at data being sent from one NetWare network to another, via an intranet. NetWare networks use the IPX (Internet Packet Exchange) protocol as a way to deliver data-and TCP/IP networks can't recognize that protocol. To get around this, when an IPX packet is to be sent across an intranet, it is first encapsulated inside an IP packet by a NetWare server specifically for and dedicated to providing the IP transport mechanism for IPX packets.

Data sent within an intranet must be broken up into packets of less than 1,500 characters each. TCP breaks the data into packets. As it creates each packet, it calculates and adds a checksum to the packet. The checksum is based on the byte values, that is, the precise amount of data in the packet.

Each packet, along with the checksum, is put into separate IP wrappers or "envelopes." These wrappers contain information that details exactly where on the intranet-or the Internet-the data is to be sent. All of the wrappers for a given piece of data have the same addressing information so that they can all be sent to the same location for reassembly.

The packets travel between networks by intranet routers. Routers examine all IP wrappers and look at their addresses. These routers determine the most efficient path for sending each packet to its final destination. Since the traffic load on an intranet often changes, the packets may be sent along different routes, and the packets may arrive out of order. If the router sees the address is one located inside the intranet, the packet may be sent directly to its destination, or it may instead be sent to another router. If the address is located out on the Internet, it will be sent to another router so it can be sent across the Internet.

As the packets arrive at their destination, TCP calculates a checksum for each packet. It then compares this checksum with the checksum that has been sent in the packet. If the checksums don't match, TCP knows that the data in the packet has been corrupted during transmission. It then discards the packet and asks that the original packet be retransmitted.

TCP includes the ability to check packets and to determine that all the packets have been received. When all the non-corrupt packets are received, TCP assembles them into their original, unified form. The header information of the packets relays the sequence of how to reassemble the packets.

An intranet treats the IP packet as it would any other, and routes the packet to the receiving NetWare network. On the receiving NetWare network, a NetWare TCP/IP server decapsulates the IP packet-it discards the IP packet, and reads the original IPX packet. It can now use the IPX protocol to deliver the data to the proper destination.

Common Gateway Interface (CGI) - Part 2

2010-12-18T19:50:00.002+07:00

Common Gateway Interface

CGI programs provide one way to create dynamic content. The server can recognise when a URL request requires a CGI program to be run in order to generate content for a web page. The program generates the content, and the server passes it back to the client (the web browser).

Whenever a URL request is made that calls the CGI program, a new CGI instance is started. This in fact is one of the main drawbacks with CGI: if too many instances are started, server performance can be impacted.

Languages that can be used for CGI

CGI programs are often written in Perl, but they can be written in C, LISP, Pascal, or many other languages. CGI itself is not a language, but is an interface between a web server and the program being run.

A simple CGI program (written in Perl)

1: #!/usr/bin/perl -w

2: use CGI qw(:standard);

3: use strict;

4: print header;

5: print "Goodbye cruel world";

Line 1 - This defines the location of the Perl interpreter on the web server. It must be the first line in the program. The -w enables warnings to be generated if the program contains any uninitialized variables.

Line 2 - Include the CGI module in the program. qw(:standard) causes the standard set of functions from the CGI module to be imported into the program.

Line 3 - Use strict enforces good coding practices. If 'use strict' wasn't used, certain coding errors would be allowed to slip through when the program was run.

Line 4 - Print header. This imports the header function from the CGI module. It prints a standard header (defining the content type) so that the browser knows what is being sent to it.

Line 5 - Displays a line of text on the screen.

Running the CGI program

To run the program it needs to be copied into the correct directory (typically, cgi-bin) and needs to be made executable (chmod 755). You can then browse to the program to run it.

Common Gateway Interface (CGI) - Part 1

2010-12-18T19:44:00.002+07:00

Common Gateway Interface

Graphical web browsers first appeared around 1993, and for a while people were content to view static pages, which always displayed the same content each time the page was displayed. Gradually though, people began to expect more from their web experience and one of the results of this was the arrival of dynamic pages.

Nowadays there are plenty of technologies and languages that allow the user of a browser to execute a program on the web server, and to thereby receive dynamic, as well as static, content. However, the first to offer this capability was the Common Gateway Interface (CGI) technology.

Browsing Web Pages

The web is basically two systems trying to exchange data with each other: the client (browser) on one side who is normally trying to get data, and the web server on the other side who is normally sending data to the client.

The client makes a request for a page, and then the server tries to fetch that page from a hard disk and send it to the client.

The Uniform Resource Locator (URL)

To request a web page a client uses a Uniform Resource Locator (URL), for example, http://www.alexa.com/index.php.

http is the usual protocol (set of rules) used for transferring web pages. It means Hypertext Transfer Protocol. A couple of other protocols that you will often come across are https, which means secure http, and ftp, which means File Transfer Protocol.

www.alexa.com is the hostname. This is the name of the web server and is sometimes written as an Internet Protocol (IP) address, for example, 123.617.934.321. dixondevelopment.co.uk is also known as the domain name.

index.php is the file (web page) on the server to be retrieved.

If the page exists, it is sent from the server to the client; if it doesn't, a 'missing page' error message is displayed in the web browser.

Dynamic Web Pages

When sending a static web page, the server 'simply' needs to locate the required page and then send it to the browser (of course, in reality, this isn't simple at all!).

Sometimes though, this is not enough, and the web server needs to send dynamically-generated content to the browser. A typical example of this is when data is extracted from a database based on some search criteria entered into the browser. The reason pages like this are known as dynamic pages is because much of the content displayed on the resultant web page will be different each time the page is sent to the browser. In other words, different searches will generate different content for the page.

Intranet

2010-12-18T19:34:00.004+07:00

Introduction to Intranets

What exactly is an intranet? It's one of those terms that's more thrown around than understood, and has become more of a buzzword than a commonly understood idea. Simply put, an intranet is a private network with Internet technology used as the underlying architecture. An intranet is built using the Internet's TCP/IP protocols for communications. TCP/IP protocols can be run on many hardware platforms and cabling schemes. The underlying hardware is not what makes an intranet-it's the software protocols that matter.

Intranets can co-exist with other local area networking technology. In many companies, existing "legacy systems" including mainframes, Novell networks, minicomputers, and various databases, are being integrated into an intranet. A wide variety of tools allow this to happen. Common Gateway Interface (CGI) scripting is often used to access legacy databases from an intranet. The Java programming language can be used to access legacy databases as well.

With the enormous growth of the Internet, an increasing number of people in corporations use the Internet for communicating with the outside world, for gathering information, and for doing business. It didn't take long for people to recognize that the components that worked so well on the Internet could be equally valuable internally and that is why intranets are becoming so popular. Some corporations do not have TCP/IP networks, the protocol required to access the resources of the Internet. Creating an intranet in which all the information and resources can be used seamlessly has many benefits. TCP/IP-based networks make it easy for people to access the network remotely, such as from home or while traveling. Dialing into an intranet in this way is much like connecting to the Internet, except that you're connecting to a private network instead of to a public Internet provider. Interoperability between networks is another substantial bonus.

Security systems separate an intranet from the Internet. A company's intranet is protected by firewalls-hardware and software combinations that allow only certain people to access the intranet for specific purposes.

Intranets can be used for anything that existing networks are used for-and more. The ease of publishing information on the World Wide Web has made them popular places for posting corporate information such as company news or company procedures. Corporate databases with easy-to-build front-ends use the Web and programming languages such as Java.

Intranets allow people to work together more easily and more effectively. Software known as groupware is another important part of intranets. It allows people to collaborate on projects; to share information; to do videoconferencing; and to establish secure procedures for production work. Free server and client software and the multitude of services, like newsgroups, stimulated the Internet's growth. The consequence of that growth stimulated and fueled the growth of intranets. The ease with which information can be shared, and with which people can communicate with one another will continue to drive the building of intranets.

A Global View of an Intranet

An intranet is a private corporate or educational network that uses the Internet's TCP/IP protocols for its underlying transport. The protocols can run on a variety of network hardware, and can also co-exist with other network protocols, such as IPX. People from inside an intranet can get at the larger Internet resources, but those on the Internet cannot get into the intranet, which allows only restricted access from the Internet.

Videoconferencing is an important application that requires sending massive quantities of data. Intranets can be built using components that allow the extremely high bandwidths required for transferring such information.

Often an intranet is composed of a number of different networks inside a corporation that all communicate with one another via TCP/IP. These separate networks are often referred to as subnets.

Software that allows people to communicate with each other via e-mail and public message boards and to collaborate on work using workgroup software is among the most powerful intranet programs. Applications that allow different corporate departments to post information, and for people to fill out corporate forms, such as time sheets, and for tapping into corporate financial information are very popular.

Much of the software used on intranets is standard, off-the-shelf Internet software such as the Netscape Navigator and the Microsoft Explorer Web browsers. And customized programs are often built, using the Java programming language and CGI scripting.

Intranets can also be used to allow companies to do business-to-business transactions, such as ordering parts, sending invoices, and making payments. For extra security, these intranet-to-intranet transactions need never go out over the public Internet, but can travel over private leased lines instead.

Intranets are a powerful system for allowing a company to do business online, for example, to allow anyone on the Internet to order products. When someone orders a product on the Internet, information is sent in a secure manner from the public Internet to the company's intranet, where the order is processed and completed.

In order to protect sensitive corporate information, and to ensure that hackers don't damage computer systems and data, security barriers called firewalls protect an intranet from the Internet. Firewall technology uses a combination of routers, servers and other hardware and software to allow people on an intranet to use Internet resources, but blocks outsiders from getting into the intranet.

Many intranets have to connect to "legacy systems"-hardware and databases that were built before an intranet was constructed. Legacy systems often use older technology not based on the intranet's TPC/IP protocols. There are a variety of ways in which intranets can tie to legacy systems. A common way is to use CGI scripts to access the database information and pour that data into HTML formatted text, making it available to a Web browser.

Information sent across an intranet is sent to the proper destination by routers, which examine each TCP/IP packet for the IP address and determine the packet's destination. It then sends the packet to the next router closest to the destination. If the packet is to be delivered to an address on the same subnetwork of the intranet it was sent from, the packet may be able to be delivered directly without having to go through any other routers. If it is to be sent to another subnetwork on the intranet, it will be sent to another internal router address. If the packet is to be sent to a destination outside the intranet-in other words, to an Internet destination-the packet is sent to a router that connects to the Internet.

IP Address Classes, and Address Masks

2010-12-18T19:30:00.003+07:00

IP Address

An IP address is a unique logical identifier for a node or host connection on an IP network. IP address is a 32 bit binary number, and represented by 4 decimal values of 8 bits each. The decimal values range from 0 to 255. This is known as "dotted decimal" notation.

Example: 192.189.210.078

It is sometimes useful to view the values in their binary form.

Dotted decimal representation: 192 .189 .210 .078

Binary representation: 11000000.10111101.11010010.1001110

Every IP address consists of network identifier and node identifier. The IP network is divided based on Class of network. The class of network is determined by the leading bits of the IP address as shown below.

Address Classes

There are 5 different address classes. You can determine which class any IP

address is in by examining the first 4 bits of the IP address.

Class A addresses begin with 0xxx, or 1 to 126 decimal.

Class B addresses begin with 10xx, or 128 to 191 decimal.

Class C addresses begin with 110x, or 192 to 223 decimal.

Class D addresses begin with 1110, or 224 to 239 decimal.

Class E addresses begin with 1111, or 240 to 254 decimal.

Addresses beginning with 01111111, or 127 decimal, are reserved for loopback and for internal testing on a local machine. Class D addresses are reserved for multicasting. Class E addresses are reserved for future use. They should not be used for host addresses.

Now we can see how the Class determines, by default, which part of the IP address belongs to the network (N) and which part belongs to the Host/node (H).

Class A: NNNNNNNN.HHHHHHHH.HHHHHHHH.HHHHHHHH

Class B: NNNNNNNN.NNNNNNNN.HHHHHHHH.HHHHHHHH

Class C: NNNNNNNN.NNNNNNNN.NNNNNNNN.HHHHHHHH

In the example, 192.189.210.078 is a Class C address so by default the Network part of the address (also known as the Network Address) is defined by the first three octets (192.189.210.XXX) and the node part is defined by the last one octets (XXX.XXX.XXX.078).

In order to specify the network address for a given IP address, the node section is set to all "0"s. In our example, 192.189.210.0 specifies the network address for 192.189.210.078. When the node section is set to all "1"s, it specifies a broadcast that is sent to all hosts on the network. 192.189.210.255 specifies the broadcast address.

Private Subnets

There are three IP network addresses reserved for private networks. The addresses are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. They can be used by anyone setting up internal IP networks, such as an intranet. Internet routers never forward the private addresses over the public Internet.

Affiliate Programs

2010-12-17T20:21:00.002+07:00

Affiliate Programs

So, you have decided to take the plunge and create a website that earns money through affiliate programs. Congratulations! While you are planning to start earning money online with affiliate programs, you probably do not know the types of affiliate programs that are available.

What's the next step?

The next step is to locate reputable, reliable, and high commission programs that match your website's subject matter. Your first stop might be an Affiliate Directory. Choosing the right affiliate program is very important to your beginning success as an affiliate marketer.

What is an Affiliate Directory?

An affiliate website directory is a website created by an expert affiliate marketer (sometimes) who generally has signed up with all kinds of affiliate programs and lists them on a website by category and type. Here you can find some basic information that will set you off on the right foot to start an affiliate program. The directory can help you find all kinds of affiliate programs to earn money from your website.

A quick note no single directory has a listing of ALL the affiliate programs. So make a point to visit several and subscribe to your favorites. Unlike many directories, http://www.bestofaffiliates.com is geared towards finding and locating only the best payouts, from reliable affiliate programs to help you focus on the best programs for your topic.

What is an Affiliate Program Review?

An affiliate program review is usually conducted by someone who has deep experience in the affiliate field and can provide objective, honest reviews about the quality of the program. A review will typically include average amount of payout reported by the program owner, commission structure, and an analysis of the tools provided by the program to help you track your sales.

For you to achieve any success with affiliate programs, you will need to choose an affiliate program that has an exceptional product or service, a generous commission, and necessary support and a website that will make it easy for you to make sales.

http://www.bestofaffiliates.com Is both a directory and an affiliate review program. They conduct reviews and give you honest, unbiased feedback about the quality, reliability, and reputation of the program. This provides you with research and analysis that a novice affiliate marketer might not have the expertise to identify. This place does that hard work for you.

What is the Difference?

A directory is really a collection of different types affiliate programs. They provide you with basic information, a link to sign up for the program, and a basic understanding of commission structures.

An affiliate program review website that also provides directory services handles a great deal of the leg work for you. Best of Affiliates can help you find a whole list of affiliate programs to choose from, because the affiliate programs are all listed on one site.

A review site digs deeper into affiliate programs than a directory tends to do. An affiliate review website will review all programs, but make recommendations on programs that pass their stringent guidelines. Although many review sites will still provide affiliate links to other programs, they do caution you if the product is less than idea for a beginner or for someone who needs in-depth reporting tools

A directory has literally thousands of programs and this easily becomes overwhelming for a beginning affiliate marketer. Which program should you choose? Where do you begin? How do you really know which program is premium, which is really going to cost you time and effort?

Only a few affiliate program directories list programs with the best and most-rewarding commission structure. Affiliate program reviews make this easier for you by highlighting the tough spots, and heavily promoting the top notch programs. Some review sites, like Best of Affiliates will only list top rated affiliate programs, and alert you immediately via their newsletters, or discussion groups about rising program stars, or others that may be scams in disguise.

Some affiliate program directories offers free resources, tools, tutorials, e-zine and courses. Keep an eye on some of these "free" resources, as they could be varnishing the truth, especially if the "free" resource ends up asking for money later on to download the "complete" article or e-book.

If you are striving to become successful with affiliate programs, you should be well educated about how to succeed as an affiliate, and you need access to various marketing tools that can help you make sales. Best of Affiliates provides useful information and resources for its readers which you will help you earn high affiliate commissions.

Affiliates fail and give up for one main reason: they haven't learned how to make money with their chosen programs. Best of Affiliates has created a list service that you can join and learn from other successful affiliates, and get any help or support you need from other affiliates.

Architect Programs

2010-12-16T11:43:00.002+07:00

Architect Programs

The National Architectural Accrediting Board (NAAB) is the sole agency authorized to accredit US professional degree programs in architecture. Since most state registration boards in the United States require any applicant for licensure to have graduated from a NAAB-accredited program, obtaining such a degree is an essential aspect of preparing for the professional practice of architecture.

There are currently 154 NAAB accredited professional programs in architecture housed in 123 institutions offering the Doctor of Architecture (1), Master of Architecture (95) or Bachelor of Architecture degree (58). In addition, six (6) institutions, are in the midst of establishing a professional degree program in architecture; these seven have been granted candidacy status.

Virus Protection Programs

2010-12-16T11:42:00.001+07:00

Virus Protection Programs

Are you looking for the best virus protection programs for your PC? If you have tried researching on the internet, you would definitely have come across a wide variety of software, and it can get quite confusing to choose the right one for you. This article has listed some of the most important features that a virus protection program should have.

1. Regular Update Of Virus Database

The best and most reputable anti-virus programs will always update their programs regularly by sending out update patches whenever the user is online. These companies recognize the fact that new viruses and spyware are created daily, and it is necessary for them to update their program file definitions frequently.

2. Offers Real Time Protection

The software program that I use will scan my network traffic whenever I am on the internet and also when I am opening files online. This form of real time protections prevents new spyware or viruses from entering my PC while you surf the internet. Alerts are shown when a potentially dangerous file is about to be opened or when I am about to enter an infected website.

3. Will Not Affect Your System's Performance Negatively

There are some antivirus and antispyware programs that will slow down your computer when you install and run them. You will definitely not want a program like that, but you cannot know which software are like this unless you read consumer reviews.

A good company should allow you to download a trial copy of their software on their website. I have personally used a great antivirus software to deal with all the viruses on my PC before in just 5 minutes. You can find out more about it at the website link below.

Photography Programs

2010-12-11T19:41:00.003+07:00

Photography Programs

A brilliant pianist has no need to look at the ivory, his hands know the way. This is also true with a great photographer, and the best photography programs instill this in their students. While allowing their talent to shine through students with excellent photography skills are able to function with their cameras instinctively. They are so familiar with their equipment and the training is so etched in their mind they are able to simply work, allowing their talent to show itself while the training keeps them on the path of correct procedure.

The following is a short list of schools with excellent photography programs: Brooks Institute of Photography in Santa Barbara Ca., Brown College Mendota Heights, MN. Harrington College of Design, Ohio Institute of Photography and Technology, and Briarcliffe College. These are all notable schools that give fine photography training. These schools stay abreast of the latest technology in the business. Students are given the necessary training to keep them competitive in a highly competitive market. The best photography programs prepare a student to walk into any photography situation and go to work.

The best photography programs teach a student to be creative without losing control of the elements needed to make a shoot successful. In the best photography programs students are encouraged to find their comfort zone and expand on it while learning the discipline required for success. The Photography business is extremely competitive and a good photography program does not allow its students to go out without having the skills necessary to compete. Many things are taught in the best photography programs: Video Photography, Film Photography, Visual Journalism, Still Life Photography, Advertising, Portrait, and Commercial Photography.

A student learns and becomes proficient with their technical ability they are able to completely concentrate on there talent while taking care of the other aspects of the photography business. The camera is machinery a photography student must become familiar with; in a sense the camera is his lifeline. In the best photography programs the use of the camera becomes second nature the student has been trained so well.

The camera and the hand of the artist has been the recorder of history for generations. The development of these skills has only come to fruition through training. People become so developed with this skill they almost function without thought of the technical, completely concentrating on the art, the way only an artist can do. The best photography programs have a hand on learning situation, allowing the student to make mistakes with the benefit of professional correction. We get unforgettable movie images and pictures of events that stay with us; this is partly due to reflective genius, and training given by the best photography programs. Photographic excellence is everywhere we look, and many places we don't.

Computer Drawing Programs

2010-12-06T20:48:00.001+07:00

Computer Drawing Programs

A drawing program is computer software which people can use to create different kinds of accurate images on a computer screen.

It is also known as vector graphics editor. This tool is usually compared with bitmap editors. The main function of both programs is to balance each other. This program is very useful for page layer, to design graphics, logos and typography. The recent version of this type of drawing program consists of tools that once bitmap editors had.

The main feature of drawing the program is that they mostly support animation. There are many drawing programs produced specially to create animation graphics. Generally, desktop provides drawing software like Adobe Photoshop which is used to design digital paintings.

Nowadays, the advance features are available in these types of programs, which can allow people to design exclusive documents of multiple pages.

For computer assisted drawing, there are many programs available in the market. Maya and Blender are the latest 3D drawing programs which are extensions of the normal 2D programs. They both have some similar tools and concepts.

With the help of simulating light transport, the rendering tools of a drawing program can convert a rough drawing into the actual image easily. The image which appears after the process will be photo realistic image.

An image rendered by such programs will transform light from one place to another and the light will interact with different surfaces.

Images are stored with this program that will be in form of grid or pixels. The color and brightness of an image are recorded by the pixels. Image editors enlarge the image. For editing vector images, the vector graphics software is generally used. Vector images are saved as details of lines, Bezier spleens and text.

These images are really very easy to modify and this feature makes this program very popular among the people.

Learn from today's expert how to paint and draw step by step with the help of pictures on your core subject whether it is oil, watercolor, acrylic, fabric painting, pencil, cartoon drawing, or digital art.

Study Abroad Programs

2010-12-04T21:27:00.000+07:00

Summer study abroad programs can range from learning about physiological ecology in the Galapagos Islands to learning Spanish in Peru. With all the programs available it can be hard choosing just one, but some things will almost always remain the same no matter which summer study abroad program you choose.

Choosing a Summer Study Abroad Program to Apply for

While most scholastic institutes offer a variety of summer study abroad programs, bear in mind that you can usually apply for a program outside of the school you might currently be attending and still have the option of financial aide covering you. Even if you are not attending any schools, a summer study abroad program is within your reach. Local colleges and universities usually have listings of any study abroad programs they have available and if the requirements for signing up for that program are not listed then you could always check with one of the attending counselors for further information.

Passports, Visas, and Medical Releases - Oh My! Passport rules have changed recently, at least for American citizens. As of January 23, 2007 the long expected new passport rules take effect today. US citizens traveling to Mexico, Canada and the Caribbean will need to show valid passports in order to re-enter the country. So when you are busy planning a summer study abroad program, remember to secure one more thing: Your Passport! These new passport rules are required to secure the borders of the United States against terrorist acts. Recent statistics show that just about one quarter of Americans hold valid passports. This is because until now most US citizens could travel to Mexico, Canada and the Caribbean without passports. Showing just a driver's license or a birth certificate was sufficient. But with these new passport regulations all that changes, effective January 23, 2007.

So if you are planning to spend a summer studying in any one of those countries, take steps to get your passport now. While a passport isn't usually too hard to get, it can still take a fair amount of time so you should be applying for that before or around the same time as you're applying for the summer study abroad program of your choice. A travel visa should usually be applied for around the same time as you are applying for the study abroad program for the simple fact that they can take quite some time to be processed properly and returned to you in good standing.

Before you head off on your trip you should also be sure to check if you need any medical release forms stating a clean bill of health and/or up to date vaccinations. For instance, if traveling to tropical South America you might be required to get a Yellow Fever vaccination before being allowed to travel. But don't let the paperwork scare you away from a summer study abroad program. The opportunities available during such a program are virtually limitless and can provide a wealth of wonderful memories.

Accommodations

A majority of summer study abroad programs will have accommodations already planned out for you, but it's usually wise to make sure beforehand so you know where you'll be staying during the course of your program. If lodging is not provided and you will need to make your own arrangements for a place to stay, the internet can be a great help in locating an affordable hotel room or short term apartment. Language barriers can make for a slightly sticky situation when trying to set up lodging arrangements from a distance, but it's not usually too difficult to get around them long enough to have a place available for when you get there so that you can make some more stable plans.

A lesser known choice in summer study abroad programs includes the option to learn while on an ocean voyage that stops at various countries. Such a program can be available to anyone, student or not, and help make clear your own culture by showing you the varying cultures of other locations. So no matter what your taste is, specific language to general world interdependence awareness, or your age, there's bound to be a summer study abroad program for you.

Remote Desktop Programs

2010-12-04T20:32:00.002+07:00

Remote Desktop Programs

If you have multiple computers in different locations, such as a home computer, an office computer and a laptop that you keep with you, remote desktop can be a valuable asset to keep in your software toolbox. The purpose of this software program is to allow you to access other computers from afar, which means that you can gain access to your home computer from your office, your office computer from your home and both computers from your laptop computer. If you have different files on each of these computers, then being able to access them at will is a very important consideration.

Remote desktop programs give you the freedom to work remotely using any remote personal computer. With most of these software solutions, you simply have to connect to the other computer and you will see its desktop screen on a real-time basis just like you were sitting in front of that actual computer. Any mouse movements, button clicks and key presses are transmitted to that remote computer allowing you to manage it exactly how you would if you were actually sitting in front of it. If you need access to your other computers, this is an excellent way to get it done.

There is no reason why you cannot perform any and all computer tasks remotely, including your administration tasks, support tasks, configuration tasks, troubleshooting tasks and anything else that you do on a daily basis. Another outstanding benefit of the remote desktop software is that technical support individuals can use remote connecting in order to gain control over your computer during the diagnostic and repair process if you cannot bring your computer to them. If you work closely with a technical support specialist and trust them to remote into your computer, you can greatly simplify the repair process when things go wrong.

With some remote desktop software programs you can also share access to the remote computers with other people. Most windows remote connection tools only allow for a single active session per personal computer, which means if the logged on user is using the computer, then you cannot connect to it. Some software programs like this, however, allow you to connect even if someone is already logged on. They will see what you are doing on the computer and you will see what they are doing at the same time as long as the connection is being shared.

Programming Courses

2010-11-27T21:30:00.002+07:00

Programming Courses

There are countless Neuro Linguistic Programming courses available. You could easily spend thousands of dollars on individual courses. It's important to find one that meets your needs.

Mastering Neuro Linguistic Programming (NLP) gives you the ability to change the way you perceive events and experiences that you store in your subconscious mind. Once you change these thoughts and beliefs you can then control your responses and how you handle situations and people.

NLP can be used to improve your life in endless ways from improving your self confidence, to increasing motivation, to improving relationships, to creating undeniable success by recreating excellence. Your behavior is influenced by your perceptions and when you re-program those perceptions within your subconscious mind you are able to take control of you life in a profound way.

Learning NLP gives you the ability to make amazing changes in your life. Sorting through the many Neuro Linguistic Programming courses can be a daunting task. You don't need to spend thousands of dollars to make major changes in your life. There are exceptional home study programs available for under $200. In fact there are some that are incredibly extensive and combine NLP and hypnosis into a powerful and life altering course.

When you master NLP and hypnosis you become an unbelievable force. They are both very significant tools that create immeasurable change on their own, but when you combine these two fields you become unstoppable.

Imagine having the ability to achieve your desired goals and put your life on a better path. With the knowledge you will gain from a home study program you can do just that.

The mind is an incredibly powerful operating machine that when programmed with positive perceptions allows you to strive and reach your aspirations. Modern Psychology claims that "NLP may be the most powerful vehicle for change in existence." You can master that vehicle and begin making those changes today.

If you stay on the path you are currently on and continue to do what you are doing, how will you life look in 1 year, 5 years, or even 10 years? Will you have attained your dreams? By mastering NLP and hypnosis you can change that scenario. In order for change to occur you must take action and put the ball in motion. Take control of your life today and change the direction you are headed. Master these phenomenal fields and reach your desired goals for you and your loved ones. There is one home study course that I feel stands heads and tails above the rest and you can learn more about it at my site on NLP and hypnosis (Hypnosis and the Mind.)

Program Design

2010-11-26T19:52:00.000+07:00

It is common knowledge that exercising with proper technique is very important, but even if you have great form, it doesn't necessarily mean you have a good workout routine. Technique is certainly an important element, but the design of your exercise program is equally important. Program design includes things like how much weight you use, the number of reps, how long you rest between sets, etc. There are many important elements in program design, but the one I will focus on today is choosing the actual exercises you perform.

Selecting the right exercises is critical if you want to design a training program for a specific purpose, such as improving performance in a sport. For example, soccer players should focus on exercises to improve their leg, core, and neck muscles and not design a training program made up of only arm exercises. This example is common sense, but many people end up performing workouts or designing training programs without really thinking about why they are including each exercise in their program.