- A
CoPP uses ACLs to match traffic destined for the control plane.
Correct because CoPP relies on ACLs to classify traffic that is sent to the control plane.
- B
CoPP is applied as a service policy on the control plane interface.
Correct because the policy map is applied to the control plane using the 'service-policy' command under 'control-plane' configuration.
- C
CoPP can only be used to rate-limit traffic, not to drop it.
Why wrong: Incorrect because CoPP can both rate-limit and drop traffic using police actions such as 'drop' or 'transmit'.
- D
CoPP is applied to all physical interfaces to protect the data plane.
Why wrong: Incorrect because CoPP is applied to the control plane, not to physical interfaces; data plane protection is handled by other mechanisms like ACLs on interfaces.
- E
CoPP can only filter IPv4 traffic.
Why wrong: Incorrect because CoPP can filter both IPv4 and IPv6 traffic using appropriate ACLs.
Quick Answer
The correct answer is that CoPP is applied as a service policy on the control plane interface. This is because Control Plane Policing (CoPP) uses ACLs to classify traffic destined for the router’s control plane, then applies a policy map to rate-limit or drop that traffic, protecting the CPU from excessive or malicious packets. On the ENCOR 350-401 exam, this concept tests your understanding of where CoPP operates—it is applied directly to the control plane, not to physical interfaces, and it only filters traffic that is punted to the control plane, not the data plane forwarding path. A common trap is confusing CoPP with interface-level QoS or assuming it protects data plane traffic. Remember the key distinction: CoPP is a control plane service policy, not an interface policy. A useful memory tip is “CoPP cops the CPU traffic”—it only polices what reaches the control plane, not what is switched in hardware.
CCNP ACLs and CoPP Practice Question
This 350-401 practice question tests your understanding of acls and 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 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 uses ACLs to match traffic destined for the control plane.
CoPP uses ACLs to classify traffic destined for the control plane and applies a policy map to rate-limit or drop that traffic. It protects the control plane from excessive or malicious traffic. The service policy is applied to the control plane, not to interfaces. CoPP does not protect the data plane forwarding path; it only filters traffic that is punted to the control plane. CoPP can be applied to both IPv4 and IPv6 traffic.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 ACLs to match traffic destined for the control plane.
Why this is correct
Correct because CoPP relies on ACLs to classify traffic that is sent to the control plane.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
CoPP is applied as a service policy on the control plane interface.
Why this is correct
Correct because the policy map is applied to the control plane using the 'service-policy' command under 'control-plane' configuration.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
CoPP can only be used to rate-limit traffic, not to drop it.
Why it's wrong here
Incorrect because CoPP can both rate-limit and drop traffic using police actions such as 'drop' or 'transmit'.
- ✗
CoPP is applied to all physical interfaces to protect the data plane.
Why it's wrong here
Incorrect because CoPP is applied to the control plane, not to physical interfaces; data plane protection is handled by other mechanisms like ACLs on interfaces.
- ✗
CoPP can only filter IPv4 traffic.
Why it's wrong here
Incorrect because CoPP can filter both IPv4 and IPv6 traffic using appropriate ACLs.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
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ACLs and CoPP — study guide chapter
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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 — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: CoPP uses ACLs to match traffic destined for the control plane. — CoPP uses ACLs to classify traffic destined for the control plane and applies a policy map to rate-limit or drop that traffic. It protects the control plane from excessive or malicious traffic. The service policy is applied to the control plane, not to interfaces. CoPP does not protect the data plane forwarding path; it only filters traffic that is punted to the control plane. CoPP can be applied to both IPv4 and IPv6 traffic.
What should I do if I get this 350-401 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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 →
Same concept, more angles
1 more ways this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which two statements about Control Plane Policing (CoPP) are true? (Choose two.)
medium- ✓ A.CoPP applies QoS policy-map logic to traffic that is destined to the control plane of the router.
- ✓ B.CoPP is configured under the 'control-plane' global configuration mode.
- C.CoPP can be applied to both IPv4 and IPv6 traffic in a single policy-map.
- D.CoPP is applied to traffic transiting the router, not to traffic originated by the router.
- E.The default action for CoPP is to permit all control-plane traffic.
Why A: 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.
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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