350-401 Practice Question: Which two statements about the interaction…

Which two statements about the interaction between ACLs and 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

✓

ACLs are used in CoPP class-maps to match specific control-plane traffic types.

ACLs are used within CoPP to classify control-plane traffic. CoPP can protect against DoS attacks, and ACLs provide the classification. The incorrect options misstate the order of processing or the scope of CoPP.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
ACLs are used in CoPP class-maps to match specific control-plane traffic types.
Why this is correct
Correct because CoPP uses class-maps that reference ACLs to identify traffic such as SSH, SNMP, or routing protocol packets.
✓
CoPP can rate-limit ICMP packets destined to the router by using an ACL to match ICMP in the class-map.
Why this is correct
Correct because an ACL can match ICMP traffic, and CoPP can apply a police action to limit its rate to the control plane.
✗
ACLs applied to interfaces take precedence over CoPP policies for control-plane traffic.
Why it's wrong here
Incorrect because CoPP is applied to the control plane itself; interface ACLs affect traffic before it reaches the control plane, but CoPP is the final arbiter for control-plane-bound packets.
✗
CoPP can only use extended ACLs, not standard ACLs, for classification.
Why it's wrong here
Incorrect because CoPP can use both standard and extended ACLs, though extended ACLs are more common for granularity.
✗
CoPP policies are applied globally and affect all traffic entering the router, including transit traffic.
Why it's wrong here
Incorrect because CoPP only affects traffic destined to the control plane, not transit traffic.

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Last reviewed: Jun 18, 2026

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