- A
BGP is not advertising routes due to CoPP dropping update packets.
Why wrong: One route is being advertised, so updates are being sent.
- B
BGP is advertising routes correctly, and CoPP is not affecting outbound updates.
The route is advertised with weight 32768, indicating local origin, and no errors are shown.
- C
BGP is receiving routes but not advertising them due to CoPP.
Why wrong: The output shows advertised routes, not received.
- D
BGP session is down due to CoPP.
Why wrong: The output is valid, indicating the session is up.
Question 1,674 of 2,152
300-410 Control Plane Policing (CoPP) Practice Question
This 300-410 practice question tests your understanding of control plane policing (copp). The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command to troubleshoot a Control Plane Policing (CoPP) issue:
R1# show bgp neighbors 10.1.1.2 advertised-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 *> 10.2.2.0/24 0.0.0.0 0 32768 i
Total number of prefixes 1
What does this output indicate?
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 advertising routes correctly, and CoPP is not affecting outbound updates.
The output shows that BGP has one prefix (10.2.2.0/24) in the advertised-routes table for neighbor 10.1.1.2, with the next hop set to 0.0.0.0 (indicating a locally originated route). This confirms that BGP is successfully advertising routes outbound, and there is no evidence of CoPP dropping update packets. CoPP would only affect control plane traffic destined to the router itself, not outbound BGP updates, which are forwarded in the data plane.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 advertising routes due to CoPP dropping update packets.
Why it's wrong here
One route is being advertised, so updates are being sent.
- ✓
BGP is advertising routes correctly, and CoPP is not affecting outbound updates.
Why this is correct
The route is advertised with weight 32768, indicating local origin, and no errors are shown.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
BGP is receiving routes but not advertising them due to CoPP.
Why it's wrong here
The output shows advertised routes, not received.
- ✗
BGP session is down due to CoPP.
Why it's wrong here
The output is valid, indicating the session is up.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume CoPP can affect outbound BGP updates, but CoPP only polices inbound control plane traffic, so a successful advertised-routes output proves CoPP is not the cause of any advertisement failure.
Trap categories for this question
Command / output trap
The output shows advertised routes, not received.
Detailed technical explanation
How to think about this question
CoPP uses a class map and policy map to rate-limit or drop control plane packets (e.g., BGP TCP port 179) before they reach the route processor. However, outbound BGP updates are generated by the router and sent via the forwarding plane, so they bypass CoPP entirely. A common real-world scenario is misdiagnosing a missing route advertisement as a CoPP issue when it is actually a BGP next-hop reachability or prefix-list problem.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Control Plane Policing (CoPP) — This question tests Control Plane Policing (CoPP) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: BGP is advertising routes correctly, and CoPP is not affecting outbound updates. — The output shows that BGP has one prefix (10.2.2.0/24) in the advertised-routes table for neighbor 10.1.1.2, with the next hop set to 0.0.0.0 (indicating a locally originated route). This confirms that BGP is successfully advertising routes outbound, and there is no evidence of CoPP dropping update packets. CoPP would only affect control plane traffic destined to the router itself, not outbound BGP updates, which are forwarded in the data plane.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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