- A
CoPP applies QoS policy-map logic to traffic that is destined to the control plane of the router.
Correct because CoPP uses MQC (Modular QoS CLI) to classify and police control-plane-bound traffic.
- B
CoPP is configured under the 'control-plane' global configuration mode.
Correct because the 'control-plane' command enters the control-plane configuration mode where the service-policy is applied.
- C
CoPP can be applied to both IPv4 and IPv6 traffic in a single policy-map.
Why wrong: Incorrect because CoPP policy-maps are protocol-specific; separate policies are needed for IPv4 and IPv6.
- D
CoPP is applied to traffic transiting the router, not to traffic originated by the router.
Why wrong: Incorrect because CoPP polices traffic destined to the control plane, not transit traffic; transit traffic is handled by data-plane ACLs.
- E
The default action for CoPP is to permit all control-plane traffic.
Why wrong: Incorrect because CoPP does not have a default permit; if no policy is applied, all control-plane traffic is implicitly permitted, but once a policy is applied, the default action is deny unless an explicit permit class is configured.
CCNP ACLs and CoPP Practice Question
This 350-401 practice question tests your understanding of acls and copp. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 two statements about Control Plane Policing (CoPP) are true? (Choose two.)
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 applies QoS policy-map logic to traffic that is destined to the control plane of the router.
CoPP protects the control plane by policing traffic destined to it. The correct answers describe its location and default behavior. The incorrect options confuse CoPP with data-plane ACLs or misstate the default action.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 applies QoS policy-map logic to traffic that is destined to the control plane of the router.
Why this is correct
Correct because CoPP uses MQC (Modular QoS CLI) to classify and police control-plane-bound traffic.
Related concept
Authentication checks who the user is.
- ✓
CoPP is configured under the 'control-plane' global configuration mode.
Why this is correct
Correct because the 'control-plane' command enters the control-plane configuration mode where the service-policy is applied.
Related concept
Authentication checks who the user is.
- ✗
CoPP can be applied to both IPv4 and IPv6 traffic in a single policy-map.
Why it's wrong here
Incorrect because CoPP policy-maps are protocol-specific; separate policies are needed for IPv4 and IPv6.
- ✗
CoPP is applied to traffic transiting the router, not to traffic originated by the router.
Why it's wrong here
Incorrect because CoPP polices traffic destined to the control plane, not transit traffic; transit traffic is handled by data-plane ACLs.
- ✗
The default action for CoPP is to permit all control-plane traffic.
Why it's wrong here
Incorrect because CoPP does not have a default permit; if no policy is applied, all control-plane traffic is implicitly permitted, but once a policy is applied, the default action is deny unless an explicit permit class is configured.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 350-401 questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this 350-401 question test?
ACLs and CoPP — This question tests ACLs and CoPP — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: CoPP applies QoS policy-map logic to traffic that is destined to the control plane of the router. — CoPP protects the control plane by policing traffic destined to it. The correct answers describe its location and default behavior. The incorrect options confuse CoPP with data-plane ACLs or misstate the default action.
What should I do if I get this 350-401 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 350-401 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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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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