Refer to the exhibit. If the router R1 returns the given output and has not had its router ID set manually, what address will EIGRP use as its router ID?

The correct answer is D. 1.1.1.1. EIGRP selects its router ID using the following priority order: (1) a manually configured router ID, (2) the highest IP address among all loopback interfaces, and (3) the highest IP address among all active physical interfaces. Since no manual router ID is set, EIGRP checks loopb

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Question

Refer to the exhibit. If the router R1 returns the given output and has not had its router ID set manually, what address will EIGRP use as its router ID?

Options

A192.168.1.2
B172.16.4.1
C192.168.10.2
D1.1.1.1

How the community answered

(28 responses)

A
4% (1)
B
4% (1)
C
7% (2)
D
86% (24)

Explanation

EIGRP selects its router ID using the following priority order: (1) a manually configured router ID, (2) the highest IP address among all loopback interfaces, and (3) the highest IP address among all active physical interfaces. Since no manual router ID is set, EIGRP checks loopback interfaces first. Loopback interfaces are preferred because they never go down. The address 1.1.1.1 is a loopback interface address and, being a loopback, takes priority over any physical interface addresses like 172.16.4.1 or 192.168.10.2.

Topics

#EIGRP Router ID#loopback interface#highest IP address#router ID selection

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