- A
CoPP does not support IPv6 traffic
Why wrong: CoPP fully supports IPv6 control plane traffic.
- B
IPv6 traffic is automatically classified as critical
Why wrong: Classification depends on the ACL or class-map configuration, not on the IP version.
- C
CoPP can police IPv6 traffic using the same policy-map as IPv4
CoPP uses a single policy-map that can match both IPv4 and IPv6 traffic via ACLs or class-maps.
- D
IPv6 control plane traffic is not subject to CoPP
Why wrong: IPv6 traffic is subject to CoPP just like IPv4 traffic.
Question 194 of 2,152
Control Plane Policing for IPv6 Traffic
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 statement about CoPP and IPv6 control plane traffic is correct?
Quick Answer
The answer is that CoPP can police IPv6 traffic using the same policy-map as IPv4. This is correct because Control Plane Policing operates at the control plane level, applying a single policy-map to classify and rate-limit traffic before it reaches the CPU, regardless of the IP version. While the policy-map framework is shared, the key technical nuance is that IPv6-specific protocols such as OSPFv3 or RIPng require their own ACLs or class-maps within that policy to be properly matched, as they use different protocol numbers and headers than their IPv4 counterparts. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding that CoPP is protocol-agnostic at the policy level but protocol-specific at the classification level—a common trap is assuming you need a separate policy-map for IPv6. A solid memory tip: “Same policy, different match”—the policy-map is unified, but the match statements must be tailored to the IPv6 protocol.
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 can police IPv6 traffic using the same policy-map as IPv4
C is correct because Control Plane Policing (CoPP) uses MQC (Modular QoS CLI) policy-maps that can match both IPv4 and IPv6 traffic via class-maps referencing ACLs or protocol headers. The same policy-map can contain separate class entries for IPv4 and IPv6 traffic, allowing unified policing of control plane packets regardless of IP version. This is explicitly supported in Cisco IOS/IOS-XE, and CoPP is not limited to IPv4.
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 does not support IPv6 traffic
Why it's wrong here
CoPP fully supports IPv6 control plane traffic.
- ✗
IPv6 traffic is automatically classified as critical
Why it's wrong here
Classification depends on the ACL or class-map configuration, not on the IP version.
- ✓
CoPP can police IPv6 traffic using the same policy-map as IPv4
Why this is correct
CoPP uses a single policy-map that can match both IPv4 and IPv6 traffic via ACLs or class-maps.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
IPv6 control plane traffic is not subject to CoPP
Why it's wrong here
IPv6 traffic is subject to CoPP just like IPv4 traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that CoPP is IPv4-only, but the trap here is that CoPP is protocol-agnostic and can police IPv6 traffic using the same MQC framework, including within a single policy-map.
Detailed technical explanation
How to think about this question
Under the hood, CoPP leverages the control plane's aggregate and per-interface queues, applying a policy-map to the control-plane service policy. When matching IPv6 traffic, you can use an IPv6 ACL (e.g., permit icmp any any nd-na) or match protocol keywords like 'ipv6' in the class-map. A real-world scenario is protecting against IPv6 Neighbor Discovery (ND) floods; CoPP can rate-limit ND packets without affecting legitimate IPv4 traffic, using the same policy-map with separate class entries for each protocol.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
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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: CoPP can police IPv6 traffic using the same policy-map as IPv4 — C is correct because Control Plane Policing (CoPP) uses MQC (Modular QoS CLI) policy-maps that can match both IPv4 and IPv6 traffic via class-maps referencing ACLs or protocol headers. The same policy-map can contain separate class entries for IPv4 and IPv6 traffic, allowing unified policing of control plane packets regardless of IP version. This is explicitly supported in Cisco IOS/IOS-XE, and CoPP is not limited to IPv4.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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