- A
Modify the CoPP ACL to include a permit statement for UDP port 161 from host 192.168.1.50 before the deny statement.
Correct because this allows SNMP traffic from the NMS to be classified and permitted by the CoPP policy.
- B
Increase the police rate for the CoPP class that matches SNMP traffic.
Why wrong: Incorrect because the issue is not rate limiting; the traffic is being dropped by an ACL deny.
- C
Remove the CoPP policy from the control plane and rely on interface ACLs.
Why wrong: Incorrect because removing CoPP leaves the control plane vulnerable.
- D
Change the SNMP port on the router to a non-standard port to avoid the CoPP policy.
Why wrong: Incorrect because this would require changes on the NMS and may not resolve the issue if the CoPP policy is not updated.
CCNP ACLs and CoPP Practice Question
This 350-401 practice question tests your understanding of acls and copp. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A network engineer is troubleshooting an issue where a Cisco router is not responding to SNMP polls from a network management station (NMS) at 192.168.1.50. The router has a CoPP policy that includes a class-map matching SNMP traffic (UDP port 161). The engineer checks the CoPP statistics and sees that SNMP packets from the NMS are being dropped. The engineer wants to allow SNMP from the NMS while still protecting the control plane. Which configuration change should the engineer make?
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
Modify the CoPP ACL to include a permit statement for UDP port 161 from host 192.168.1.50 before the deny statement.
The correct answer is to modify the CoPP ACL to permit SNMP from the NMS before the deny statement, ensuring that the traffic is matched and permitted. Option B is incorrect because increasing the police rate might not help if the traffic is being denied by an ACL. Option C is incorrect because removing the CoPP policy removes all protection. Option D is incorrect because changing the SNMP port would require reconfiguring the NMS.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Modify the CoPP ACL to include a permit statement for UDP port 161 from host 192.168.1.50 before the deny statement.
Why this is correct
Correct because this allows SNMP traffic from the NMS to be classified and permitted by the CoPP policy.
Related concept
Standard ACLs match source addresses.
- ✗
Increase the police rate for the CoPP class that matches SNMP traffic.
Why it's wrong here
Incorrect because the issue is not rate limiting; the traffic is being dropped by an ACL deny.
- ✗
Remove the CoPP policy from the control plane and rely on interface ACLs.
Why it's wrong here
Incorrect because removing CoPP leaves the control plane vulnerable.
- ✗
Change the SNMP port on the router to a non-standard port to avoid the CoPP policy.
Why it's wrong here
Incorrect because this would require changes on the NMS and may not resolve the issue if the CoPP policy is not updated.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.
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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 — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Modify the CoPP ACL to include a permit statement for UDP port 161 from host 192.168.1.50 before the deny statement. — The correct answer is to modify the CoPP ACL to permit SNMP from the NMS before the deny statement, ensuring that the traffic is matched and permitted. Option B is incorrect because increasing the police rate might not help if the traffic is being denied by an ACL. Option C is incorrect because removing the CoPP policy removes all protection. Option D is incorrect because changing the SNMP port would require reconfiguring the NMS.
What should I do if I get this 350-401 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 18, 2026
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