Question: 59. Consider the network in Figure 3.56, using link-state routing. Suppose the B-F link fails, and the following then occur in sequence: (a) Node H

59. Consider the network in Figure 3.56, using link-state routing. Suppose the B-F link fails, and the following then occur in sequence: (a) Node H is added to the right side with a connection to G. (b) Node D is added to the left side with a connection to C. (c) A new link D-A is added. The failed B-F link is now restored. Describe what link-state packets will flood back and forth. Assume that the initial sequence number at all nodes is 1, that no packets time out, and that both ends of a link use the same sequence number in their LSP for that link, greater than any sequence number either used before. 8 FIGURE 3.56 Network for Exercise 59

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