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Question 28 - 312-38 discussion

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Which of the following are the distance-vector routing protocols? Each correct answer represents a complete solution. Choose all that apply.

A.
IS-IS
Answers
A.
IS-IS
B.
OSPF
Answers
B.
OSPF
C.
IGRP
Answers
C.
IGRP
D.
RIP
Answers
D.
RIP
Suggested answer: C, D

Explanation:

Following are the two distance-vector routing protocols:

RIP: RIP is a dynamic routing protocol used in local and wide area networks. As such, it is classified as an interior gateway protocol (IGP). It uses the distancevector routing algorithm. It employs the hop count as a routing metric. RIP prevents routing loops by implementing a limit on the number of hops allowed in a path from the source to a destination. It implements the split horizon, route poisoning, and hold-down mechanisms to prevent incorrect routing information from being propagated.

IGRP: Interior Gateway Routing Protocol (IGRP) is a Cisco proprietary distance vector Interior Gateway Protocol (IGP). It is used by Cisco routers to exchange routing data within an autonomous system (AS). This is a classful routing protocol and does not support variable length subnet masks (VLSM). IGRP supports multiple metrics for each route, including bandwidth, delay, load, MTU, and reliability. Answer options B and A are incorrect. OSPF and IS-IS are link state routing protocols.

asked 18/09/2024
GIORGOS KELAIDIS
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