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

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Chapter 6

A1: IGRP does not use a UDP port. It is accessed directly from the network layer, as protocol number 9.
A2: The maximum IGRP network diameter is 255 hops.
A3: The default IGRP update period is 90 seconds.
A4: IGRP specifies an autonomous system number so that multiple IGRP processes can be enabled within the same routing domain and even on the same router.
A5: McCloy will advertise 192.168.1.0 to Acheson as a system route because the address is being advertised into another major network. Acheson will advertise 172.16.0.0 as a system route to McCloy, and as an interior route to Kennan.
A6: The default IGRP holddown time is 280 seconds.
A7: IGRP can use bandwidth, delay, load, and reliability to calculate its metric. By default, it uses only ...

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