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WAN Protocols

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Introduction

What are WAN Protocols? WAN Protocols are the standardised method of sending data between computers. The protocol will determine how the data is compressed, the error checking to be used, how the sending device will indicate that all data is sent, how the receiving device will declare it's received everything. The WAN protocols are found in The Internet Protocol Suite. They are shown below in the diagram showing where they lie in the 4 layer TCP/IP Model. Sometimes, the TCP/IP protocol will be extended to include the physical layer also, but this is fairly uncommon and all protocols will work over all medias. Just like the OSI model, each protocol must pass the data down the layers to send out information and then send up the layer to receive information. So for example, the File Transfer Protocol will pass its data down to TCP which will pass it down to IT, which will pass it down to Ethernet which will place it on a physical media such as coaxial cable. To receive the data back, it must travel back through the stacks back to FTP. Each of the protocols on each stack will have its own set of tasks that it must carry out before sending the data on. Using this set group of protocols ensures that computers are capable of communicating between each other and therefore allows compatibility across devices. ...read more.

Middle

For example, a HTML page must be displayed in HTML. A page linking to a zip file will require an unzip based program to handle it. FTP is an unsecured method of transferring files across the network. It is not considered a good method for secure documents to be sent as any security that has been added can very easily be decrypted and the contents can easily be viewed. All information sent along with the file, for example: passwords or destination are not encrypted and are sent in standard text. This means that anybody with access to the network could pull the file down and check its contents. It sends the file without checking with the other computer if the entire file has been received. Some clients will add an extra level on top of the FTP file that can calculate and check for file completion but this has to be enforced by both clients and is infrequently used. FTP is not really suitable for regular business situations. FTP replaces Simple File Transfer Protocol. Telnet is a method of connecting two computers together via a remote connection. Usually, the connection is aimed at a headless server. Once the connection is established using Telnet software, the user has access as though they are in front of that computer. SSH has vastly replaced Telnet because of its security problems across networks that are untrusted. ...read more.

Conclusion

The last update was in 2006 and this further improved the protocol and ensures that it stays the standard method of accessing newsgroups. This protocol is popular with the types of businesses that require access the news posting sites - these are particularly popular with computing based businesses. The IMAP protocol is capable only reading and so is not a viable alternative. X.25 is a packet switching protocol that predates IP. It is still found in situations where an extremely reliable system is required such as EPOS systems that allow businesses to take debit and credit cards. It is also popular in the developing world where it the cheapest and most reliable method of connecting to the internet. It is much slower than IP as it requires all of its packets to be received before moving the packets again. IP is the current industry standard packet switching method and was designed in 1981. It is a network level protocol that splits data into packets, addresses them and sends them forward. IP works closely with TCP to ensure that the data packets are received correctly as it sends the packets without ensuring they are received. All other protocols will work through IP as it converts upper layer data into packets. IPv4 is the current version in use, but users are being encouraged to move towards IPv6 as it allows more addresses to be used. ?? ?? ?? ?? 1 WAN Protocols Information Sheet ...read more.

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