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Answers to Assessment Test

D. In the IOS command area area-id virtual-link router-id,
the router-id is the highest loopback IP number configured on a
router. If a loopback interface has not been configured on the router,
then the router-id is the highest IP address configured on the router.
For more information, see Chapter 5.

B, D. VLSM is compatible only with classless routing protocols.
Classless routing protocols have the ability to carry subnet informa-
tion in their route advertisements. RIPv1 and IGRP are classful,
whereas RIPv2 and EIGRP are classless. For more information, see
Chapter 3.

B. The

default-metric

command ensures proper metric conversion

when redistributing routes from different protocols. See Chapter 6 for
more information.

D, E. Even though routers do break up collision domains, only
bridges and switches are used specifically to break up collision
domains. See Chapter 1 for more information on segmentation of a
network.

D. The MTU size metric component is the Maximum Transmission
Unit (in bytes) over a specified interface. For example, the default
MTU size for an Ethernet interface is 1,500 bytes. For more informa-
tion, see Chapter 10.

C. RIPv2 is still distance-vector and acts accordingly. However, it
sends prefix routing information in the route updates so it can support
VLSM. See Chapter 2 for more information on RIPv2.

A. When designing OSPF networks, each area within an OSPF rout-
ing process should have a link to the backbone area (Area 0). How-
ever, when an area is not physically adjacent to Area 0, a virtual link
can be used to connect across the transit area, which separates the area
from Area 0. For more information, see Chapter 5.

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