Question 1,199 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-DEFAULT (match-any) 5000 packets, 300000 bytes 5 minute offered rate 4000 bps, drop rate 2000 bps Match: any police: cir 32000 bps, bc 6000 bytes, be 6000 bytes conformed 3000 packets, 180000 bytes; actions: transmit exceeded 1000 packets, 60000 bytes; actions: drop violated 1000 packets, 60000 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 control plane traffic is being transmitted without issues.
Why wrong: The drop rate is 2000 bps, indicating packet loss.
B
Some control plane traffic is being dropped, which could cause routing protocol instability.
Dropped packets in the class-default can affect critical control plane traffic.
C
The police rate is set to 64000 bps.
Why wrong: The CIR is 32000 bps.
D
Only ICMP traffic is being dropped.
Why wrong: The class-default matches any traffic, not just ICMP.

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

✓

Some control plane traffic is being dropped, which could cause routing protocol instability.

The output shows that the CoPP policy is policing control plane traffic with a CIR of 32000 bps. The 'exceeded' and 'violated' counters indicate that 2000 packets (120000 bytes) have been dropped, with a drop rate of 2000 bps. This means some control plane traffic is being dropped, which can cause routing protocol instability (e.g., BGP, OSPF keepalives being dropped).

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 control plane traffic is being transmitted without issues.
Why it's wrong here
The drop rate is 2000 bps, indicating packet loss.
✓
Some control plane traffic is being dropped, which could cause routing protocol instability.
Why this is correct
Dropped packets in the class-default can affect critical control plane traffic.
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 64000 bps.
Why it's wrong here
The CIR is 32000 bps.
✗
Only ICMP traffic is being dropped.
Why it's wrong here
The class-default matches any traffic, not just ICMP.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the misinterpretation of the 'police' counters: candidates may see 'conformed' packets and assume no drops, missing the 'exceeded' and 'violated' counters that clearly indicate dropped traffic.

Detailed technical explanation

How to think about this question

CoPP uses a class-map to match control plane traffic and applies a policer with conform, exceed, and violate actions. The 'bc' and 'be' values (6000 bytes each) define the token bucket sizes; traffic exceeding the CIR is dropped, which can silently disrupt routing protocol adjacencies if keepalives or hellos are dropped. In real-world scenarios, this often manifests as intermittent BGP flaps or OSPF neighbor resets.

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.

Visual reference

Quick reference

Routing Protocol Comparison

Protocol	Metric	Max Hops	Algorithm	Type
RIP v2	Hop count	15	Bellman-Ford	Distance vector
OSPF	Cost (bandwidth)	Unlimited	Dijkstra (SPF)	Link state
EIGRP	Composite metric	Unlimited	DUAL	Hybrid
IS-IS	Cost	Unlimited	Dijkstra	Link state
BGP	Policy / attributes	Unlimited	Path vector	Path vector

RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.

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: Some control plane traffic is being dropped, which could cause routing protocol instability. — The output shows that the CoPP policy is policing control plane traffic with a CIR of 32000 bps. The 'exceeded' and 'violated' counters indicate that 2000 packets (120000 bytes) have been dropped, with a drop rate of 2000 bps. This means some control plane traffic is being dropped, which can cause routing protocol instability (e.g., BGP, OSPF keepalives being dropped).

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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