- A
All BGP packets are being transmitted without any drops.
Why wrong: The output shows exceeded and violated packets being dropped.
- B
BGP traffic is being rate-limited and some packets are being dropped.
The police counters show packets are being dropped due to exceeding the CIR.
- C
The police rate is set to 16000 bps.
Why wrong: The CIR is 8000 bps.
- D
The class-default is matching BGP traffic.
Why wrong: BGP traffic is matched by the CoPP-BGP class.
Question 182 of 2,152
300-410 Control Plane Policing (CoPP) Practice Question
This 300-410 practice question tests your understanding of control plane policing (copp). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on Router R1:
R1# show policy-map control-plane
Control Plane
Service-policy input: CoPP-IN
Class-map: CoPP-BGP (match-all) 500 packets, 30000 bytes 5 minute offered rate 1000 bps, drop rate 500 bps Match: access-group 120 police: cir 8000 bps, bc 1500 bytes, be 1500 bytes conformed 300 packets, 18000 bytes; actions: transmit exceeded 100 packets, 6000 bytes; actions: drop violated 100 packets, 6000 bytes; actions: drop
Based on this output, which statement is correct?
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 traffic is being rate-limited and some packets are being dropped.
The output shows that under the CoPP-BGP class, the police command has a committed information rate (CIR) of 8000 bps. The counters indicate 100 packets exceeded and 100 packets violated, both with a drop action, while only 300 packets conformed and were transmitted. This confirms that BGP traffic is being rate-limited and some packets are being dropped, making option B correct.
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.
- ✗
All BGP packets are being transmitted without any drops.
Why it's wrong here
The output shows exceeded and violated packets being dropped.
- ✓
BGP traffic is being rate-limited and some packets are being dropped.
Why this is correct
The police counters show packets are being dropped due to exceeding the CIR.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The police rate is set to 16000 bps.
Why it's wrong here
The CIR is 8000 bps.
- ✗
The class-default is matching BGP traffic.
Why it's wrong here
BGP traffic is matched by the CoPP-BGP class.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the interpretation of police counters (conformed, exceeded, violated) and the specific CIR value, leading candidates to mistakenly think that all packets are transmitted (option A) or that the police rate is double the CIR (option C) due to confusion with dual-rate policing.
Trap categories for this question
Command / output trap
The output shows exceeded and violated packets being dropped.
Detailed technical explanation
How to think about this question
Control Plane Policing (CoPP) uses a hierarchical policy-map applied to the control plane, where the police action implements a token bucket algorithm with conform, exceed, and violate actions. In this output, the exceed and violate counters both show drops, indicating that the single-rate three-color marker (srTCM) is configured with a CIR of 8000 bps and burst sizes (bc and be) of 1500 bytes; packets exceeding the CIR are dropped, which can impact BGP session stability if keepalives or updates are dropped. In real-world scenarios, CoPP must be carefully tuned to avoid dropping critical routing protocol packets, as even a few dropped BGP keepalives can cause neighbor flapping.
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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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 traffic is being rate-limited and some packets are being dropped. — The output shows that under the CoPP-BGP class, the police command has a committed information rate (CIR) of 8000 bps. The counters indicate 100 packets exceeded and 100 packets violated, both with a drop action, while only 300 packets conformed and were transmitted. This confirms that BGP traffic is being rate-limited and some packets are being dropped, making option B correct.
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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