The answer is that the CoPP policy is rate-limiting traffic to 8000 bps, but no traffic has matched the class yet. This is correct because the `show policy-map control-plane input class vrf` command isolates CoPP statistics for a specific VRF in a VRF-Lite deployment, and all counters—packets, bytes, offered rate, and drop rate—are zero, indicating the class-map CoPP-ACL has not been hit. On the Cisco CCNP ENARSI 300-410 exam, this tests your ability to interpret VRF-Lite CoPP show command output and distinguish between a policy that is actively dropping traffic and one that simply has no matching traffic; a common trap is assuming zero counters mean the policy is broken, when it actually means the ACL or VRF traffic hasn’t triggered the class. Remember the memory tip: “Zero counters, zero hits—check your ACL bits.”
300-410 VRF-Lite Practice Question
This 300-410 practice question tests your understanding of vrf-lite. 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 runs the following command to troubleshoot a VRF-Lite CoPP issue:
R1# show policy-map control-plane input class CoPP-ACL vrf CUSTOMER_I
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The CoPP policy is rate-limiting traffic to 8000 bps, but no traffic has matched the class yet.
The 'show policy-map control-plane input class vrf' command displays CoPP policy statistics for a specific VRF. The output shows class CoPP-ACL matching access-group 100, with a police rate of 8000 bps. All counters are zero, indicating no traffic has matched this class. This could mean the ACL is not matching any packets, or no traffic is being sent to the control plane for this VRF.
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.
✗
The CoPP policy is dropping all packets that match access-group 100.
Why it's wrong here
Incorrect. The conformed action is 'transmit', and no packets have exceeded or violated.
✓
The CoPP policy is rate-limiting traffic to 8000 bps, but no traffic has matched the class yet.
Why this is correct
Correct. The police rate is 8000 bps, but all counters are zero, so no matching traffic has been seen.
Related concept
Standard ACLs match source addresses.
✗
The CoPP policy has matched many packets and is dropping them due to exceeding the rate.
Why it's wrong here
Incorrect. All counters are zero, so no packets have matched.
✗
The CoPP policy is not applied to the control plane for this VRF.
Why it's wrong here
Incorrect. The output shows the policy-map is applied to the control-plane input.
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.
Trap categories for this question
Command / output trap
Incorrect. The output shows the policy-map is applied to the control-plane input.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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 300-410 ACL questions on filtering logic and placement.
VRF-Lite — This question tests VRF-Lite — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The CoPP policy is rate-limiting traffic to 8000 bps, but no traffic has matched the class yet. — The 'show policy-map control-plane input class vrf' command displays CoPP policy statistics for a specific VRF. The output shows class CoPP-ACL matching access-group 100, with a police rate of 8000 bps. All counters are zero, indicating no traffic has matched this class. This could mean the ACL is not matching any packets, or no traffic is being sent to the control plane for this VRF.
What should I do if I get this 300-410 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 300-410 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 300-410 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 300-410 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.