What command essentially turns on auto summarization for EIGRP?

The correct answer is B. router eigrp 1. In Cisco IOS 12.x, EIGRP auto-summarization was enabled by default. This means that simply entering 'router eigrp 1' and configuring EIGRP automatically activates auto-summary - classful summarization occurs at major network boundaries without any additional configuration. This…

Advanced Addressing and Routing Solutions

Question

Options

Aarea 0 range 10.0.0.0 255.0.0.0.0
Brouter eigrp 1
Cip summary-address eigrp 1 10.0.0.0 255.0.0.0
Dip summary-address 10.0.0.0 255.0.0.0
Eeigrp stub

How the community answered

(21 responses)

A
5% (1)
B
90% (19)
C
5% (1)

Explanation

In Cisco IOS 12.x, EIGRP auto-summarization was enabled by default. This means that simply entering 'router eigrp 1' and configuring EIGRP automatically activates auto-summary - classful summarization occurs at major network boundaries without any additional configuration. This behavior caused issues in discontiguous networks, which is why Cisco changed the default in IOS 15.x to have auto-summary disabled by default. On older IOS versions covered by this exam, 'router eigrp 1' essentially turns on auto summarization implicitly. The 'ip summary-address eigrp' command (C) is for manual summary configuration, not auto-summary.

Topics

#EIGRP#auto summarization#routing protocol#summarization command

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