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Chapter 5
Interconnecting OSPF Areas
Answers to Review Questions
1.
A, B, and D. As the size of a single area OSPF network grows, so
does the size of the routing table and OSPF database that has to be
maintained. Also, if there is a change in network topology, the OSPF
algorithm has to be rerun for the entire network.
2.
B. An autonomous system boundary router (ASBR) is any OSPF
router that is connected to an external routing process.
3.
D. A not-so-stubby area (NSSA) imports external routes (Type 7
LSAs) via route redistribution and then translates these Type 7 LSAs into
Type 5 LSAs.
4.
C. The command
area area-id range network-address
network-mask
is used on an ABR to summarize routes before they are
injected into an area.
5.
D. The IOS command show ip ospf database shows details about
a router's OSPF database. Some of these details include router link
states and network link states.
6.
A. An area border router (ABR) is any OSPF router that is connected
to more than one OSPF area.
7.
B. Routers in a stub area do not receive Type 5 LSAs (referred to as
AS External Link Advertisements). Instead, they use a default route to
reach external networks.
8.
A. The router configuration command area area-id nssa is used
to designate an area as a not-so-stubby area (NSSA).
9.
A. An autonomous system boundary router (ASBR) is any OSPF
router that is connected to an external routing process.
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