Discussion
A network administrator views the output from the show ip route command. A network that is advertised by both RIP and IGRP appears in the routing table flagged as an IGRP route. Why is the RIP route to this network not used in the routing table?
Answer: B
Correct answer: IGRP has a lower administrative distance.
When two protocols offer a route to the same network, the router compares administrative distance first and never reaches the metrics - which are not comparable between protocols in any case, hop count meaning nothing beside a composite of bandwidth and delay. IGRP’s distance is 100 against RIP’s 120, so the IGRP route is installed and the RIP one is held in reserve.
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