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Unformatted text preview: CSCE 464 Wireless and Mobile Systems Fall 2011 Homework 7 (55 points) Problem 1 (5 points) Consider an ad hoc network using DSR (Dynamic Source Rout- ing). Since DSR uses route caching, a source node S may be aware of multiple routes to a destination D. Suppose that the source S randomly selects one of the known routes to D, with least number of hops, for each packet sent to D (thus different routes may be used for different packets). Describe a potential advantage of this approach, and a potential disadvantage of this approach. Assume that the trac sent by S may contain UDP and TCP packets. Problem 2 (10 points) Consider Figure 6.6 from Lecture Notes (page 124). Re-draw the routing tables shown in Figure 6.6 (a)-(d) (i.e., routing tables at A and D), when all initial link costs are twice those shown in Figure 6.6a. Problem 3 (5 points) Consider a pair of nodes A and B close to each other such that a single hop route exists between these nodes. Suppose that a TCP connection exists betweensingle hop route exists between these nodes....
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- Spring '11