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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Chapter 5

A1: RIP uses UDP port 520.
A2: RIP uses a hop count metric. An unreachable network is indicated by setting the hop count to 16, which RIP interprets as an infinite distance.
A3: RIP sends periodic updates every 30 seconds minus a small random variable to prevent the updates of neighboring routers from becoming synchronized.
A4: A route entry is marked as unreachable if six updates are missed.
A5: The garbage collection timer, or flush timer, is set when a route is declared unreachable. When the timer expires, the route is flushed from the route table. This process allows an unreachable route to remain in the routing table long enough for neighbors to be notified of its status.
A6: The random timer, whose range is 1 to 5 seconds, prevents ...

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