Chapter 6

1:
A:	IGRP does not use a UDP port. It is accessed directly from the network layer, as protocol number 9.
2:
A:	The maximum IGRP network diameter is 255 hops.
3:
A:	The default IGRP update period is 90 seconds.
4:
A:	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.
5:
A:	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.
6:
A:	The default IGRP holddown time is 280 seconds.
7:
A:	IGRP can use bandwidth, delay, load, and reliability to calculate its metric. By default, it uses only bandwidth and delay.
8:
A:	An IGRP update packet can carry up to 104 route entries.