hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show policy-map control-plane
Control Plane
Service-policy input: CoPP-IN
Class-map: CoPP-SNMP (match-all) 0 packets, 0 bytes 5 minute offered rate 0000 bps, drop rate 0000 bps Match: access-group 130 police: cir 32000 bps, bc 6000 bytes, be 6000 bytes conformed 0 packets, 0 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
R1# show access-lists 130
Extended IP access list 130
10 permit udp any any eq snmp
20 permit udp any any eq snmptrapBased on this output, what is the most likely reason that no packets are matching the CoPP-SNMP class?
⚠ Common exam trap
Cisco often tests the distinction between traffic *destined* to the router (subject to input CoPP) and traffic *originated* by the router (subject to output CoPP or no CoPP), leading candidates to overlook the fact that self-generated packets do not match input policies.
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
✓
The SNMP traffic is being sent from the router itself, which is not processed through the input control plane policy.
The CoPP-SNMP class matches traffic via access-list 130, which permits SNMP and SNMP trap packets. However, the show policy-map control-plane output shows zero matched packets because the input control plane policy only processes traffic destined to the router (i.e., packets received on an interface and punted to the control plane). SNMP traffic generated by the router itself (e.g., traps or responses) is locally sourced and does not traverse the input control plane path; it is handled by the output control plane or bypasses CoPP entirely. Thus, the policy never sees these self-generated packets.
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 access-list does not include the correct SNMP port numbers.
Why it's wrong here
Ports 161 and 162 are correct for SNMP.
- ✓
The SNMP traffic is being sent from the router itself, which is not processed through the input control plane policy.
Why this is correct
Traffic originated by the router (e.g., SNMP traps) is not subject to input CoPP.
- ✗
The police rate is too low and is dropping all packets before counting.
Why it's wrong here
The counters show 0 packets, so no packets have been classified.
- ✗
The class-map is using 'match-all' instead of 'match-any'.
Why it's wrong here
With a single match criterion, both are equivalent.
Visual reference
Go deeper
Related to this question
About these practice questions
One of 1,966 original 300-410 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.