December
1998 QUESTION 5 Total Marks: 20 Marks |
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| (a) | TCP is a protocol used at the transport layer.
What functions are provided by the transport layer?
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[5] |
| (b) | The TCP/IP protocol suite is based
around a four-layer model, in contrast to the seven-layer OSI model. Name each layer in
the TCP/IP suite, and for each layer, provide a suitable example of a protocol or network
used in that layer.
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| (c) | The internet protocol suite includes a file
transfer protocol. As well as file transfer there are other functions that can be
performed with this protocol. Describe four such functions.
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[4] |
| (d) | In considering electronic mail, it
is often useful to distinguish between the mail transport agent (which handles the
transfer of mail messages from one host to another), and the mail user agent (which is
concerned with the presentation of messages to the users, and accepting new messages when
users type them). The simple mail transfer protocol (SMTP) covers one of these tasks. Which is it? Describe the features of SMTP.
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[5] |