Answers to the Chapter 6 Q&A Section 753
30
What tunneling transport protocol is used by the IOS?
To answer this question, you must know what the term transport protocol refers to.
Transport protocol refers to the protocol that both encapsulates the data and transports the
data to the other side of the tunnel. This is a trick question--there is only one transport
protocol in the IOS: IP.
31
Define the tunneling terms transport protocol, encapsulation protocol, and passenger
protocol.
The term transport protocol refers to the protocol that both encapsulates the data and
transports the data to the other side of the tunnel. The encapsulation protocol follows the
transport protocol; its main purpose is to have a type field to identify the type of packet
that is encapsulated. This encapsulated protocol is called the passenger protocol because
it is being carried to the other end of the tunnel.
32
List the Interior IP routing protocols that have auto summarization enabled by default.
Which of these protocols allows auto summary to be disabled using a configuration
command?
RIP-1, IGRP, EIGRP, and RIP-2 all have auto summarization enabled by default. EIGRP
and RIP-2 can disable this feature.
33
List the interior IP routing protocols that support route aggregation.
EIGRP and OSPF support route aggregation.
34
Identify the command that would list all IP routes learned via RIP.
The show ip route rip command would list only RIP-learned routes.
35
Identify the command(s) that would list all IP routes in network 172.16.0.0.
show ip route 172.16.0.0 lists all the routes in 172.16.0.0. Also, the show ip route
list 1 command would list routes in network 172.16.0.0, assuming that the following
configuration command also existed: access-list 1 permit 172.16.0.0 0.0.255.255.
36
Assume that several subnets of network 172.16.0.0 exist in a router's routing table. What
must be true about those routes so that the output of the show ip route command lists mask
information only on the line that lists network 172.16.0.0, but not show mask information
on each route for each subnet?
If all the subnets of 172.16.0.0 use the same mask, the output of the show ip route
command lists only the mask in the heading line for the network. If VLSM were in use,
then each route for each subnet would reflect the mask used in that case.
37
True or false: Distance vector routing protocols learn routes by transmitting routing
updates.
False. Routes are learned by receiving routing updates from neighboring routers.
apA.fm Page 753 Monday, March 20, 2000 5:24 PM