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By Lieger R., Vahan H., Rumatowski G.

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TCP/IP operates on four levels: network access (to facilitate transmission and routing of packets); network 26 U N D E R S TA N D I N G T H E I N T E R N E T protocols (governing the delivery service); transfer protocols (ensuring the machines are capable of receiving and sending packets); and application protocols (either applications themselves, or providing service to applications running across the Internet). TCP/IP is the most important set of protocols and will be dealt with in more detail below, but other, more specialised protocols include: Hypertext Transfer Protocol (HTTP), used to enable web servers and clients to share data regardless of where they are held, HTTP addresses being indicated by a Uniform Resource Locator (URL, signified as http://); FTP, developed before HTTP to enable users to access files held on remote servers; Internet Relay Chat (IRC), one of the forms of real-time communication enabling users to chat to each other; and Telnet, which allows users to log into a remote computer and send commands controlling the operating system, so that the local client operates rather like the terminals that were used for older mainframes.

As John Naughton (1999) observes, this incident was really an example of online chat rather than email per se: Kleinrock’s exchange with another conference delegate took place in ‘real time’, or was synchronous; email, on the other hand, is asynchronous, that is, sender and receiver do not need to be connected at the same time. As Naughton further comments, the emergence of email was something of a surprise to ARPA, particularly when a survey in 1973 revealed that threequarters of online traffic consisted of email – a considerable amount of it having nothing to do with computers.

Some of the protocols governing TCP/IP are error-checking protocols: if the message is incomplete, the destination computer requests the packet to be sent again. Further reading There are a number of books outlining the history of the Internet in some detail, of which Naughton (1999) is probably the best, along with Abbate (1999). Hafner and Lyon (1996) approach the same subject with considerable enthusiasm, although some of their material is beginning to date now. Berners-Lee (1999) concentrates (unsurprisingly) on the events that led to the development of the Web, but, as a contributor to the open standards movement that has provided much that is best on the Internet, his opinions are worth reading.

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