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300-410 Practice Question: Runs the following command to troubleshoot a…

A network engineer runs the following command to troubleshoot a Control Plane Policing (CoPP) issue:

R1# show bgp neighbors 10.1.1.2 received-routes

BGP table version is 10, local router ID is 10.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path *> 10.3.3.0/24 10.1.1.2 0 100 0 i

Total number of prefixes 1

What does this output indicate?

⚠ Common exam trap

Cisco often tests the distinction between CoPP dropping packets before they reach the BGP process (which would show no received routes) versus BGP receiving routes but not installing them due to other reasons like RIB-failure or policy, leading candidates to incorrectly assume CoPP affects route installation.

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

BGP is receiving routes correctly, and CoPP is not interfering with inbound updates.

The output shows a single BGP prefix (10.3.3.0/24) received from neighbor 10.1.1.2, with the route marked as valid (*) and best (>). This confirms that BGP is successfully receiving and processing the update, and the route is eligible for installation in the routing table. Since the route appears in the received-routes output, CoPP is not dropping the inbound BGP update packets, as CoPP would prevent the packets from reaching the BGP process entirely.

Answer analysis

Option-by-option breakdown

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

  • BGP is not receiving any routes due to CoPP dropping updates.

    Why it's wrong here

    One route is received, so updates are being processed.

  • BGP is receiving routes correctly, and CoPP is not interfering with inbound updates.

    Why this is correct

    The route is received from neighbor 10.1.1.2 with valid attributes.

  • BGP is receiving routes but not installing them in the routing table due to CoPP.

    Why it's wrong here

    The output shows received routes, not installation status.

  • BGP session is flapping due to CoPP.

    Why it's wrong here

    No session flap is indicated; the output is stable.

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Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

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