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300-410 Practice Question: Runs the following command on Router R1: R1# show…

A network engineer runs the following command on Router R1:

R1# show bgp ipv4 unicast 10.2.2.0/24

BGP routing table entry for 10.2.2.0/24, version 5 Paths: (1 available, best #1, table default) Not advertised to any peer Refresh Epoch 1 65002

10.1.12.2 from 10.1.12.2 (10.2.2.2)

Origin IGP, metric 0, localpref 100, valid, external, best rx pathid: 0, tx pathid: 0x0

Based on this output, what is a potential issue with this route?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The route is not being advertised to any BGP peer, possibly due to outbound filtering.

The route is valid and best, but it is 'Not advertised to any peer'. This could be due to outbound filtering, such as a route-map, prefix-list, or the neighbor not being configured to receive the route. The route is learned from an eBGP peer but not being propagated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    The route has a low local preference of 100.

    Why it's wrong here

    Local preference 100 is default and not an issue.

  • ✓

    The route is not being advertised to any BGP peer, possibly due to outbound filtering.

    Why this is correct

    The output explicitly states 'Not advertised to any peer', indicating a filtering or configuration issue preventing advertisement.

  • ✗

    The next hop 10.1.12.2 is unreachable.

    Why it's wrong here

    If the next hop were unreachable, the route would not be valid or best.

  • ✗

    The route is not installed in the routing table.

    Why it's wrong here

    The output does not show routing table status, but the route is best in BGP, so it should be installed unless there is a higher administrative distance route.

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Same concept, more angles

1 more way this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A network engineer runs the following command on Router R1: R1# show bgp ipv4 unicast 10.4.4.0/24 BGP routing table entry for 10.4.4.0/24, version 8 Paths: (1 available, best #1, table default) Not advertised to any peer Refresh Epoch 1 65006 10.1.16.6 from 10.1.16.6 (10.6.6.6) Origin IGP, metric 0, localpref 100, valid, external, best rx pathid: 0, tx pathid: 0x0 Based on this output, what is the most likely reason the route is not advertised to any peer?

hard
  • A.The route has a local preference of 100, which is too low.
  • ✓ B.There is an outbound route-map or prefix-list filtering the route.
  • C.The BGP session to the neighbor is down.
  • D.The route is not in the routing table.

Why B: The route is valid and best, but not advertised. This could be due to outbound filtering (route-map, prefix-list) applied to the BGP neighbor, or the neighbor might not be configured to receive this prefix. Another possibility is that the route is suppressed by a policy.

JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.