Question 1,625 of 2,152

Control Plane Policing (CoPP) →hardMultiple ChoiceObjective-mapped

300-410 Control Plane Policing (CoPP) Practice Question

This 300-410 practice question tests your understanding of control plane policing (copp). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 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 snmptrap

Based on this output, what is the most likely reason that no packets are matching the CoPP-SNMP class?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The access-list does not include the correct SNMP port numbers.
Why wrong: Ports 161 and 162 are correct for SNMP.
B
The SNMP traffic is being sent from the router itself, which is not processed through the input control plane policy.
Traffic originated by the router (e.g., SNMP traps) is not subject to input CoPP.
C
The police rate is too low and is dropping all packets before counting.
Why wrong: The counters show 0 packets, so no packets have been classified.
D
The class-map is using 'match-all' instead of 'match-any'.
Why wrong: With a single match criterion, both are equivalent.

Full breakdown with real-world context →

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.

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.

✗
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.

Common exam traps

Common exam trap: answer the scenario, not the keyword

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.

Trap categories for this question

Command / output trap
The counters show 0 packets, so no packets have been classified.

Detailed technical explanation

How to think about this question

Control Plane Policing (CoPP) applies to packets that are punted from the data plane to the control plane, such as routing protocol updates, management traffic (SSH, SNMP), or packets with IP options. Locally generated traffic (e.g., SNMP traps, syslog messages, routing updates originated by the router) is injected directly into the control plane's output process and is not subject to input CoPP policies. To police such traffic, an output control plane policy (service-policy output) must be applied, or the traffic must be classified at the interface level before it reaches the control plane.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Related 300-410 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Layer 3 Technologies practice questions

Practise 300-410 questions linked to Layer 3 Technologies.

EIGRP Troubleshooting practice questions

Practise 300-410 questions linked to EIGRP Troubleshooting.

OSPF Troubleshooting (v2/v3) practice questions

Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).

BGP Troubleshooting practice questions

Practise 300-410 questions linked to BGP Troubleshooting.

Route Redistribution practice questions

Practise 300-410 questions linked to Route Redistribution.

Policy-Based Routing (PBR) practice questions

Practise 300-410 questions linked to Policy-Based Routing (PBR).

VRF-Lite practice questions

Practise 300-410 questions linked to VRF-Lite.

Route Maps and Route Filtering practice questions

Practise 300-410 questions linked to Route Maps and Route Filtering.

Administrative Distance practice questions

Practise 300-410 questions linked to Administrative Distance.

Route Summarization practice questions

Practise 300-410 questions linked to Route Summarization.

Bidirectional Forwarding Detection (BFD) practice questions

Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).

VPN Technologies practice questions

Practise 300-410 questions linked to VPN Technologies.

Practice this exam

Start a free 300-410 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

300-410 practice-test guide →Study guide →Browse all practice tests

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: 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.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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 →

How Courseiva writes practice questions · Editorial policy

Keep practising

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.

Loading comments…

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.