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By Larry L. Peterson, Bruce S. Davie

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If B uses self-ARP on startup, it will receive a reply indicating that its IP address is already in use, which is a clear indication that B should not continue on the network until the issue is resolved. 14. (a) If multiple packets after the first arrive at the IP layer for outbound delivery, but before the first ARP response comes back, then we send out multiple unnecessary ARP packets. Not only do these consume bandwidth, but, because they are broadcast, they interrupt every host and propagate across bridges.

MPLS is relatively more efficient when the payload size is smaller. 68. Source routing cannot specify a long path because of the option size limit. Second, IP option processing is considerably more complex than normal IP forwarding, and can cause significant performance penalties. Finally, source routing cannot readily aggregate the traffic with the same route into one class; by contrast, MPLS can aggregate such traffic as one FEC, represented by a single label at each hop, thus improving scalability.

This route is via A. A sends (E, inf) to C. B sends (E, 6) to A. The oscillation goes on and on like this. (b) Without poison reverse, A and B would send each other updates that simply didn’t mention X; presumably (this does depend somewhat on implementation) this would mean that the false routes to X would sit there until they eventually aged out. With poison reverse, such a loop would go away on the first table update exchange. (c) 1. B and A each send out announcements of their route to X via C to each other.

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Computer Networks: A Systems Approach Fourth Edition Solutions Manual by Larry L. Peterson, Bruce S. Davie


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