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Question 16: Which dynamic routing protocol uses only the hop count to determine the best path to a
destination?
A. EIGRP
B. OSPF
C. IGRP
D. RIP
Correct Answer: D
Explanation:
Determining the best path involves the evaluation of multiple paths to the same destination network
and selecting the optimum or shortest path to reach that network. Whenever multiple paths to the
same network exist, each path uses a different exit interface on the router to reach that network.
The best path is selected by a routing protocol based on the value or metric it uses to determine the
distance to reach a network. A metric is the quantitative value used to measure the distance to a
given network. The best path to a network is the path with the lowest metric.
Dynamic routing protocols typically use their own rules and metrics to build and update routing
tables. The routing algorithm generates a value, or a metric, for each path through the network.
Metrics can be based on either a single characteristic or several characteristics of a path. Some
routing protocols can base route selection on multiple metrics, combining them into a single metric.
The following lists some dynamic protocols and the metrics they use:
Routing Information Protocol (RIP): Hop count
Open Shortest Path First (OSPF): Cisco routers use a cost based on cumulative bandwidth from source
to destination Enhanced Interior Gateway Routing Protocol (EIGRP): Bandwidth, delay, load,
reliability