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Answers to Review Questions
317
14.
C. The administrative distance is used in routing to decide the trust-
worthiness of a route. 0 is the highest rating.
15.
C. To start Routing Information Protocol (RIP) version 1 on a
router, type the global configuration mode command router rip.
16.
B. Debug ip rip is used to show the Internet Protocol (IP) Routing
Information Protocol (RIP) updates being sent and received on the router.
17.
C. You configure Interior Gateway Routing Protocol (IGRP) with an
autonomous system number and then use the network command to
tell the routing protocol which networks you want to advertise. The
entry must be a classful entry, which is why the first and last answers
are wrong.
18.
B, C. Routing protocols are used to update routing tables on routers,
and routed protocols send user data through the internetwork. IP is an
example of a routed protocol.
19.
B, D. Interior Gateway Routing Protocol (IGRP) uses bandwidth
and delay of the line, by default, to determine the best path to a remote
network.
20.
E. IGRP update timers are set by default at 90 seconds. After a route
has been determined to be invalid, the routing table flushes the entry
after seven update periods, or 630 seconds.
21.
C. You cannot have 16 hops on a RIP network by default. If
you receive a route advertised with a metric of 16, this means it
is inaccessible.
22.
C, E. IGRP uses bandwidth and delay of the line, by default, to deter-
mine the best path to a remote network. Delay of the line can some-
times be called the cumulative interface delay.
23.
C. An
I
in a routing table means it is an IGRP-found route. An S means
it is a static entry to a remote network, and R means it is a RIP route.
24.
C. Static routes have an administrative distance of zero (0) by default.
Unless you change this, a static route will always be used over any
other found route. IGRP has an administrative distance of 100, and
RIP has an administrative distance of 120, by default.
25.
C. The Branch router will only accept routes from other routers with
the same autonomous system (AS) configured. The Corporate router
has an AS of 10 and the Branch router was configured with an AS of 11,
so Branch will never accept any routes from Corporate.
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