April
1999 QUESTION 5 Total Marks: 20 Marks |
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| (a) | What is the purpose of routing? Of which layer
is it a part?
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[2] |
| (b) | Routing algorithms use a number of link
attributes in computing path costs, to determine the minimum cost path. List three such
attributes.
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[3] |
| (c) | Explain the concept of hierarchical routing,
and how it applies in the Internet.
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[7] |
| (d) | Asynchronous Transfer Mode (ATM) has some
similarities with IP, and many differences. Explain the key features of ATM, being sure to
mention its cell format, and approach to routing.
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[5] |
| (e) | Suppose you could run the transport layer TCP directly on top of ATM. Would this be better than using TCP over IP, for an interactive telnet session? Explain your answer. | [3] |