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Answers to the Chapter 6 Q&A Section 749
If RIP still were configured, IGRP's routes would be chosen over RIP. The IOS
considers IGRP to be a better source of routing information by default, as defined in
the administrative distance setting (default 120 for RIP, 100 for IGRP).
4
How does the IOS designate a subnet in the routing table as a directly connected network?
What about a route learned with IGRP and a route learned with RIP?
The show ip route command lists routes with a designator in the left side of the command
output. C represents connected routes, I is used for IGRP, and R represents RIP-derived
routes.
5
Create a configuration for IGRP on a router with these interfaces and addresses: e0 using
10.1.1.1, e1 using 224.1.2.3, s0 using 10.1.2.1, and s1 using 199.1.1.1. Use process ID 5.
router igrp 5
network 10.0.0.0
network 199.1.1.0
If you noticed that 224.1.2.3 is not a valid Class A, B, or C address, you get full credit.
A new address will be needed for Ethernet 1, with a matching network command.
6
Create a configuration for IGRP on a router with these interfaces and addresses: to0
using 200.1.1.1, e0 using 128.1.3.2, s0 using 192.0.1.1, and s1 using 223.254.254.1.
router igrp 1
network 200.1.1.0
network 128.1.0.0
network 192.0.1.0
network 223.254.254.0
Because four different networks are used, four network commands are required. If you
noticed that the question did not specify the process ID (1, in this sample) but configured
one, you get full credit. A few of these network numbers are used in examples; memorize
the range of valid A, B, and C network numbers.
7
From a router's user mode, without using debugs or privileged mode, how can you
determine what routers are sending you routing updates?
The show ip protocol command output lists the routing sources, the IP addresses of
routers sending updates to this router. Knowing how to determine a fact without looking
at the configuration will better prepare you for the exam. Also, the show ip route
command lists next-hop router IP addresses. The next-hop routers listed identify the
routers that are sending routing updates.
8
How often does IPX RIP send routing updates, by default?
Every 60 seconds.
apA.fm Page 749 Monday, March 20, 2000 5:24 PM