Consider the simple network in Figure 3.54, in which A and B exchange distance-vector routing information. All
Question:
Consider the simple network in Figure 3.54, in which A and B exchange distance-vector routing information. All links have cost 1.
Suppose the A–E link fails.
(a) Give a sequence of routing table updates that leads to a routing loop between A and B.
(b) Estimate the probability of the scenario in (a), assuming A and B send out routing updates at random times, each at the same average rate.
(c) Estimate the probability of a loop forming if A broadcasts an updated report within 1 second of discovering the A–E failure, and B broadcasts every 60 seconds uniformly
Figure 3.54)
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Lets first address part a of your question In distancevector routing each router maintains a routing table that indicates the best known distance to each destination and the first link on the best pat...View the full answer
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Related Book For 
Computer Networks A Systems Approach
ISBN: 9780128182000
6th Edition
Authors: Larry L. Peterson, Bruce S. Davie
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