- A
CoPP uses Modular QoS CLI (MQC) to define traffic classes and policies.
Correct because CoPP is configured using MQC with class maps, policy maps, and the 'service-policy' command applied to the control plane.
- B
CoPP is used to police traffic in the data plane to protect against DoS attacks.
Why wrong: Incorrect because CoPP protects the control plane, not the data plane. Data plane policing is done by other features like ACLs or QoS on interfaces.
- C
CoPP can rate-limit or drop certain types of control plane traffic to prevent CPU overload.
Correct because CoPP can apply policing actions (e.g., drop, transmit, or set a rate limit) to control plane traffic to mitigate attacks.
- D
CoPP classifies traffic into categories such as critical, normal, and management.
Correct because CoPP typically defines classes for different types of control plane traffic (e.g., routing protocols, SSH, ICMP) with appropriate policies.
- E
CoPP is applied directly to physical interfaces using the 'service-policy' command.
Why wrong: Incorrect because CoPP is applied to the control plane using 'service-policy input' under 'control-plane' configuration, not directly to interfaces.
Quick Answer
The correct answer includes that CoPP classifies traffic into categories such as critical, normal, and management. This is true because Control Plane Policing uses the Modular QoS CLI (MQC) to define class maps and policy maps that categorize control plane traffic, allowing the router to rate-limit or drop packets destined for the route processor to prevent CPU overload. On the ENCOR 350-401 exam, this concept tests your understanding of how CoPP protects the control plane by applying QoS policies, not the data plane—a common trap is confusing CoPP with interface-level policing, which is handled by other mechanisms. Remember that CoPP uses MQC classification to separate traffic into three default categories: critical, normal, and management. A useful memory tip is to think of CoPP as a "bouncer for the CPU" that sorts traffic into VIP (critical), general (normal), and staff (management) lanes.
CCNP Infrastructure Security Practice Question
This 350-401 practice question tests your understanding of infrastructure security. 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 three statements about Control Plane Policing (CoPP) are true? (Choose three.)
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
CoPP uses Modular QoS CLI (MQC) to define traffic classes and policies.
CoPP protects the control plane by applying QoS policies to traffic destined to the route processor. Option A is correct because CoPP uses MQC (Modular QoS CLI) to define class maps and policy maps. Option C is correct because CoPP can rate-limit or drop traffic to prevent CPU overload. Option D is correct because CoPP classifies traffic into categories such as critical, normal, and management. Option B is incorrect because CoPP does not apply to the data plane; it applies to the control plane. Option E is incorrect because CoPP is applied to the control plane, not to interfaces directly; interface-level policing is done by other mechanisms.
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.
- ✓
CoPP uses Modular QoS CLI (MQC) to define traffic classes and policies.
Why this is correct
Correct because CoPP is configured using MQC with class maps, policy maps, and the 'service-policy' command applied to the control plane.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
CoPP is used to police traffic in the data plane to protect against DoS attacks.
Why it's wrong here
Incorrect because CoPP protects the control plane, not the data plane. Data plane policing is done by other features like ACLs or QoS on interfaces.
- ✓
CoPP can rate-limit or drop certain types of control plane traffic to prevent CPU overload.
Why this is correct
Correct because CoPP can apply policing actions (e.g., drop, transmit, or set a rate limit) to control plane traffic to mitigate attacks.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
CoPP classifies traffic into categories such as critical, normal, and management.
- ✗
CoPP is applied directly to physical interfaces using the 'service-policy' command.
Why it's wrong here
Incorrect because CoPP is applied to the control plane using 'service-policy input' under 'control-plane' configuration, not directly to interfaces.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 350-401 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 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
Infrastructure Security — study guide chapter
Learn the concepts, then practise the questions
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Infrastructure Security practice questions
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FAQ
Questions learners often ask
What does this 350-401 question test?
Infrastructure Security — This question tests Infrastructure Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: CoPP uses Modular QoS CLI (MQC) to define traffic classes and policies. — CoPP protects the control plane by applying QoS policies to traffic destined to the route processor. Option A is correct because CoPP uses MQC (Modular QoS CLI) to define class maps and policy maps. Option C is correct because CoPP can rate-limit or drop traffic to prevent CPU overload. Option D is correct because CoPP classifies traffic into categories such as critical, normal, and management. Option B is incorrect because CoPP does not apply to the data plane; it applies to the control plane. Option E is incorrect because CoPP is applied to the control plane, not to interfaces directly; interface-level policing is done by other mechanisms.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 18, 2026
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.
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