Question 2,100 of 2,152

Control Plane Policing (CoPP) →easyMultiple ChoiceObjective-mapped

Invalid Match Criterion for Control Plane Policing Class-Map

This 300-410 practice question tests your understanding of control plane policing (copp). Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.

Which of the following is NOT a valid match criterion for a class-map used in Control Plane Policing?

Clue words in this question

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

Clue: "NOT"
Why it matters: Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.

A
match access-group
Why wrong: Incorrect. This is a valid match criterion.
B
match ip dscp
Why wrong: Incorrect. This is a valid match criterion.
C
match protocol
Correct. match protocol is not supported in CoPP; only ACLs, DSCP, or IP precedence are allowed.
D
match ip precedence
Why wrong: Incorrect. This is a valid match criterion.

Full breakdown with real-world context →

Quick Answer

The answer is match protocol, as it is not a valid match criterion for a class-map used in Control Plane Policing. CoPP class-maps are designed to filter traffic based on Layer 3 and Layer 4 parameters that can be evaluated in hardware or software on the router’s control plane, specifically supporting match access-group (referencing an ACL), match ip dscp, and match ip precedence. The match protocol command, which relies on Network-Based Application Recognition (NBAR) for deep packet inspection, is not supported because CoPP operates at a higher performance level and does not perform application-layer classification. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding of CoPP’s limitations and the distinction between control plane filtering and data plane QoS policies. A common trap is confusing CoPP class-maps with MQC class-maps used for QoS, where match protocol is valid. For a quick memory tip: remember that CoPP matches on the “three A’s” — Access-group, DSCP, and Precedence — but never on the protocol itself.

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

✓

match protocol

In Control Plane Policing (CoPP), class-maps are used to classify traffic destined to the control plane. The valid match criteria include match access-group, match ip dscp, and match ip precedence. However, match protocol is not a valid match criterion for a class-map under CoPP; it is used in other contexts like QoS policy-maps for application-level classification, but not for CoPP class-maps.

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.

✗
match access-group
Why it's wrong here
Incorrect. This is a valid match criterion.
✗
match ip dscp
Why it's wrong here
Incorrect. This is a valid match criterion.
✓
match protocol
Why this is correct
Correct. match protocol is not supported in CoPP; only ACLs, DSCP, or IP precedence are allowed.
Clue confirmation
The clue word "NOT" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
match ip precedence
Why it's wrong here
Incorrect. This is a valid match criterion.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between match criteria available in CoPP class-maps versus those in general QoS class-maps, and the trap here is that candidates assume match protocol is universally valid across all class-map types, when it is specifically excluded from CoPP.

Detailed technical explanation

How to think about this question

CoPP uses class-maps to define traffic classes that are then applied to the control plane via a policy-map. The match criteria are limited to Layer 3 and Layer 4 fields (e.g., ACLs, DSCP, IP precedence) because the control plane processes packets at the routing level. The match protocol command is used in MQC (Modular QoS CLI) for application-level classification (e.g., HTTP, FTP) but is not available for CoPP, which focuses on header-based filtering to protect the router's CPU.

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: match protocol — In Control Plane Policing (CoPP), class-maps are used to classify traffic destined to the control plane. The valid match criteria include match access-group, match ip dscp, and match ip precedence. However, match protocol is not a valid match criterion for a class-map under CoPP; it is used in other contexts like QoS policy-maps for application-level classification, but not for CoPP class-maps.

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: "NOT". Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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