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Chapter 5
IP Routing
Answers to Review Questions
1.
C. Enhanced Interior Gateway Routing Protocol (EIGRP) uses the
properties of both distance-vector and link-state.
2.
C. The
config-router
passive-interface
command stops updates
from being sent out an interface.
3.
A, C. Distance-vector routing loops are solved by using split horizon
and route holddown timers.
4.
A. The
show
protocols command provides routed protocols infor-
mation. The show ip protocols command provides routing protocol
information.
5.
C. Holddowns prevent regular update messages from reinstating a
route that has just come up.
6.
A. A split horizon will not advertise a route back to the same router
it learned the route from.
7.
D. A poison reverse is used to communicate to a router that the link
is down and that the hop count to that network is set to infinity or
unreachable.
8.
B. Interior Gateway Routing Protocol (IGRP)'s default administra-
tive distance is 100; Routing Information Protocol (RIP)'s default
administrative distance is 120.
9.
B. An IP route with a wildcard of all zeros for the destination net-
work and subnet mask is used to create a default route.
10.
C. OSPF (Open Shortest Path First) is a true link-state IP routing pro-
tocol. It uses only bandwidth as a way to determine the best path to a
remote network.
11.
A, D. To turn on Routing Information Protocol (RIP) routing, use
the router rip command followed by the network command using a
classful network address.
12.
B. After you type in router rip, you must type in the network you
want to advertise. Also, it must be the classful address, which is why
the first option is wrong.
13.
C. The
show
ip route command shows the Internet Protocol (IP)
routing table, the metric used, and the interface used to find a remote
network.
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