- A
BGP is not receiving updates due to CoPP dropping packets.
Why wrong: The route is present and valid, so updates are being received.
- B
BGP is functioning correctly, and CoPP is not interfering with BGP sessions.
The route is learned from 10.1.1.2 and is best, indicating BGP is working.
- C
BGP is stuck in idle state due to CoPP.
Why wrong: The route is valid and external, so the session is established.
- D
BGP is only advertising routes locally.
Why wrong: The path is from 10.1.1.2, which is an external neighbor.
Question 671 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 ipv4 unicast 10.1.1.0/24
BGP routing table entry for 10.1.1.0/24, version 10 Paths: (1 available, best #1, table default) Advertised to update-groups: 1 Refresh Epoch 1 Local
10.1.1.2 from 10.1.1.2 (10.1.1.2)
Origin IGP, metric 0, localpref 100, valid, external, best Last update: Mon Mar 1 00:05:23 2024
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 functioning correctly, and CoPP is not interfering with BGP sessions.
The output shows a valid BGP route for 10.1.1.0/24 with the path marked as 'valid, external, best' and a recent last update time. This indicates that the BGP session is established, updates are being received, and the route is being installed in the routing table. Since CoPP drops packets only when control plane traffic exceeds configured rate limits, the presence of a healthy BGP route with current timestamps confirms that CoPP is not interfering with BGP sessions.
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 receiving updates due to CoPP dropping packets.
Why it's wrong here
The route is present and valid, so updates are being received.
- ✓
BGP is functioning correctly, and CoPP is not interfering with BGP sessions.
Why this is correct
The route is learned from 10.1.1.2 and is best, indicating BGP is working.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
BGP is stuck in idle state due to CoPP.
Why it's wrong here
The route is valid and external, so the session is established.
- ✗
BGP is only advertising routes locally.
Why it's wrong here
The path is from 10.1.1.2, which is an external neighbor.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that any CoPP configuration automatically disrupts BGP, but the trap here is that a healthy BGP table entry with current timestamps proves CoPP is not dropping BGP packets, even if CoPP is configured.
Detailed technical explanation
How to think about this question
CoPP uses MQC (Modular QoS CLI) to classify and rate-limit control plane traffic, such as BGP packets destined to the router's CPU. When CoPP drops BGP packets, the BGP session may flap or fail to establish, leading to missing routes or stale timestamps. In this output, the 'Last update' timestamp is current, confirming that BGP keepalives and updates are passing through CoPP without being policed, which is critical for maintaining BGP convergence in production networks.
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 practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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Control Plane Policing (CoPP) — study guide chapter
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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 functioning correctly, and CoPP is not interfering with BGP sessions. — The output shows a valid BGP route for 10.1.1.0/24 with the path marked as 'valid, external, best' and a recent last update time. This indicates that the BGP session is established, updates are being received, and the route is being installed in the routing table. Since CoPP drops packets only when control plane traffic exceeds configured rate limits, the presence of a healthy BGP route with current timestamps confirms that CoPP is not interfering with BGP sessions.
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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