Question 1,409 of 2,152

Control Plane Policing (CoPP) →mediumMultiple ChoiceObjective-mapped

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-ICMP (match-all) 100 packets, 6000 bytes 5 minute offered rate 500 bps, drop rate 500 bps Match: access-group 100 police: cir 8000 bps, bc 1500 bytes, be 1500 bytes conformed 50 packets, 3000 bytes; actions: transmit exceeded 25 packets, 1500 bytes; actions: drop violated 25 packets, 1500 bytes; actions: drop

Based on this output, what is the most likely impact on the router?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
All ICMP packets are being transmitted without drops.
Why wrong: The drop rate is 500 bps, indicating packet loss.
B
ICMP traffic is being rate-limited, causing some ping requests to fail.
Dropped ICMP packets can result in ping loss.
C
The police rate is set to 16000 bps.
Why wrong: The CIR is 8000 bps.
D
The class-default is matching ICMP traffic.
Why wrong: ICMP traffic is matched by the CoPP-ICMP class.

Full breakdown with real-world context →

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

✓

ICMP traffic is being rate-limited, causing some ping requests to fail.

The output shows that ICMP traffic matching access-group 100 is being policed with a CIR of 8000 bps. Out of 100 packets, 50 were conformed (transmitted), 25 exceeded (dropped), and 25 violated (dropped). This results in a 50% packet loss, causing some ping requests to fail. The drop rate equals the offered rate (500 bps) because the policer is dropping half the traffic. Therefore, option B is 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 ICMP packets are being transmitted without drops.
Why it's wrong here
The drop rate is 500 bps, indicating packet loss.
✓
ICMP traffic is being rate-limited, causing some ping requests to fail.
Why this is correct
Dropped ICMP packets can result in ping loss.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 ICMP traffic.
Why it's wrong here
ICMP traffic is matched by the CoPP-ICMP class.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Candidates may misinterpret the 'conformed' counter as meaning all traffic is transmitted, but the exceeded and violated counters indicate actual drops. In this case, 50 packets were transmitted and 50 dropped, so the ICMP traffic is rate-limited, not completely blocked.

Detailed technical explanation

How to think about this question

The police command uses a single-rate two-color marker (CIR 8000 bps, Bc 1500 bytes, Be 1500 bytes) with violate-action drop. The exceeded and violated counters show packets that exceeded the token bucket are dropped. In CoPP, this protects the control plane from ICMP floods, but legitimate ping traffic may be impacted if the policer is too restrictive.

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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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: ICMP traffic is being rate-limited, causing some ping requests to fail. — The output shows that ICMP traffic matching access-group 100 is being policed with a CIR of 8000 bps. Out of 100 packets, 50 were conformed (transmitted), 25 exceeded (dropped), and 25 violated (dropped). This results in a 50% packet loss, causing some ping requests to fail. The drop rate equals the offered rate (500 bps) because the policer is dropping half the traffic. Therefore, option B is 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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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