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658 Appendix A: Answers to Review Questions
5
List four types of interior gateway protocols.
RIP, OSPF, IGRP, EIGRP.
6
What is administrative distance?
Administrative distance can be defined as a rating of the trustworthiness of a routing
information source. Numerically, an administrative distance is an integer between 0 and
255. The higher the value, the lower the trust rating.
7
What protocol works primarily in the Internet?
BGP.
8
List three types of routing metrics.
Hop count, delay, bandwidth.
9
What is a classless protocol?
Classless protocols support VLSMs and include network masks in their routing updates.
Classless protocols are not restricted by class boundaries.
10
List one disadvantage of classful routing protocols.
The whole network must use the same network class mask.
11
List three types of switching methods used by Cisco routers.
Process switching, fast switching, autonomous switching.
12
What is the routing metric for OSPF?
Cost.
13
List three requirements of route summarization.
Multiple IP addresses must share the same high-order bits.
Routing protcols must carry the prefix length or subnet mask in a separate field along with
the 32-bit IP address.
Routing tables and protocols must base their routing decisions on a 32-bit IP address with
a prefix length that can be up to the entire 32-bit length of the field.
14
True or false: Secondary addressing is a recommended and preferred method of
connecting discontiguous subnets.
False. Secondary addressing consumes resources. Use secondary addressing as a last
resort and as a temporary resort.
15
_________ is the exchange of routing information between two different routing
processes.
Route redistribution.
87200333.book Page 658 Wednesday, August 22, 2001 1:41 PM