Cisco CCNA mock exam questions sample test – Question 115

.Consider the following diagram:
Which of the following routing protocols could NOT be used with this design?

A. RIPv1
B. RIPv2
C. EIGRP
D. OSPF


Correct Answer: A

Explanation:
The network design displayed has subnets of a major classful network located in opposite directions from the perspective of some of the individual routers. This configuration can be
accommodated by any routing protocol that supports Variable Length Subnet masks (VLSM) or the transfer of subnet mask information in routing advertisements.
RIPv1 supports neither of these. RIPv1 will automatically summarize routing advertisements to their classful network (in this case 192.168.1.0/24). This action will cause some of the
routers to have routes to the same network with different next hop addresses, which will NOT work.
EIGRP, RIPv2 and OSPF all support VLSM and can be used in the design shown in the scenario.
Objective:
Routing Fundamentals
Sub-Objective:
Compare and contrast distance vector and link-state routing protocols
References:
Cisco > Home > Support > Technology Support > IP > IP Routed Protocols > Design > Design TechNotes > Why Don’t IGRP and RIP v1 support VLSM?