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352-001 · Question #93
352-001 Question #93: Real Exam Question with Answer & Explanation
The correct answer is B: By default, EIGRP automatically summarizes internal routes, but only each time a major network. EIGRP auto-summarization works at classful network boundaries, summary routes prevent loops via Null0 with a low AD, and the summary metric inherits the best component route metric.
Question
Which three statements about EIGRP route summarization are correct? (Choose three.)
Options
- ABy default, all EIGRP routes are automatically summarized; all routes will be summarized unless
- BBy default, EIGRP automatically summarizes internal routes, but only each time a major network
- CEIGRP route summarization can reduce the query diameter to help prevent SIA problems.
- DSummary routes are inserted in the routing table with a next hop of null 0 and a high administrative
- EThe metric for each summarized route is inherited from the lowest metric of the component routes.
Explanation
EIGRP auto-summarization works at classful network boundaries, summary routes prevent loops via Null0 with a low AD, and the summary metric inherits the best component route metric.
Common mistakes.
- A. EIGRP auto-summary does not summarize all routes unconditionally - it only triggers at classful network boundaries, so subnets within the same major network are not summarized.
- D. EIGRP summary routes are installed with Null0 as the next hop to prevent routing loops, but they are assigned a very low administrative distance (AD 5), not a high one.
Concept tested. EIGRP route summarization behavior and SIA prevention
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