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352-001 · Question #93

Which three statements about EIGRP route summarization are correct? (Choose three.)

The correct answer is B. By default, EIGRP automatically summarizes internal routes, but only each time a major network C. EIGRP route summarization can reduce the query diameter to help prevent SIA problems. E. The metric for each summarized route is inherited from the lowest metric of the component routes. 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.

Layer 3 Control Plane

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.

How the community answered

(39 responses)
  • A
    5% (2)
  • B
    85% (33)
  • D
    10% (4)

Why each option

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.

ABy default, all EIGRP routes are automatically summarized; all routes will be summarized unless

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.

BBy default, EIGRP automatically summarizes internal routes, but only each time a major networkCorrect

EIGRP auto-summary is enabled by default and summarizes internal routes only when the routing process advertises a subnet across a classful major network boundary into a different classful network, collapsing it to the classful prefix.

CEIGRP route summarization can reduce the query diameter to help prevent SIA problems.Correct

Summarization limits the scope of EIGRP feasibility condition queries because routers only query for more specific prefixes within a summarized boundary, reducing the query diameter and preventing Stuck-in-Active (SIA) conditions.

DSummary routes are inserted in the routing table with a next hop of null 0 and a high administrative

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.

EThe metric for each summarized route is inherited from the lowest metric of the component routes.Correct

When EIGRP builds a summary route, it selects the composite metric of the component route with the lowest (best) metric value and assigns that metric to the summary entry in the routing table.

Concept tested: EIGRP route summarization behavior and SIA prevention

Source: https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13511-23.html

Topics

#EIGRP#route summarization#SIA prevention#null 0 route

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