Question 468 of 2,152

Control Plane Policing (CoPP) →mediumMultiple 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-ICMP (match-all) 0 packets, 0 bytes 5 minute offered rate 0000 bps, drop rate 0000 bps Match: access-group 100 police: cir 8000 bps, bc 1500 bytes, be 1500 bytes conformed 0 packets, 0 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop

Class-map: CoPP-SSH (match-all) 0 packets, 0 bytes 5 minute offered rate 0000 bps, drop rate 0000 bps Match: access-group 110 police: cir 16000 bps, bc 3000 bytes, be 3000 bytes conformed 0 packets, 0 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop

Class-map: class-default (match-any) 1250 packets, 75000 bytes 5 minute offered rate 1000 bps, drop rate 0000 bps Match: any

Based on this output, which statement is correct?

Question 1mediummultiple choice

Study the full ACL explanation →

A
The CoPP policy is dropping all ICMP packets to the control plane.
Why wrong: The CoPP-ICMP class shows 0 packets, so no ICMP traffic has been classified or dropped.
B
The CoPP policy is not matching any packets for the CoPP-ICMP and CoPP-SSH classes.
The packet counters for both classes are zero, indicating no traffic matched these classes.
C
The CoPP policy is rate-limiting SSH traffic to 16000 bps.
Why wrong: The CoPP-SSH class shows 0 packets, so no SSH traffic has been processed.
D
The CoPP policy is applied to the output direction.
Why wrong: The output shows 'Service-policy input: CoPP-IN', indicating it is applied to the input direction.

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 CoPP policy is not matching any packets for the CoPP-ICMP and CoPP-SSH classes.

The output shows the CoPP policy applied to the control plane. The class-default has traffic, but the specific classes (ICMP and SSH) show zero packets, indicating the access-lists may not be matching traffic or the class-maps are not correctly configured. The correct answer is that the CoPP policy is not matching any packets for the defined classes.

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 ICMP packets to the control plane.
Why it's wrong here
The CoPP-ICMP class shows 0 packets, so no ICMP traffic has been classified or dropped.
✓
The CoPP policy is not matching any packets for the CoPP-ICMP and CoPP-SSH classes.
Why this is correct
The packet counters for both classes are zero, indicating no traffic matched these classes.
Related concept
Standard ACLs match source addresses.
✗
The CoPP policy is rate-limiting SSH traffic to 16000 bps.
Why it's wrong here
The CoPP-SSH class shows 0 packets, so no SSH traffic has been processed.
✗
The CoPP policy is applied to the output direction.
Why it's wrong here
The output shows 'Service-policy input: CoPP-IN', indicating it is applied to the input direction.

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
The CoPP-ICMP class shows 0 packets, so no ICMP traffic has been classified or dropped.

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 300-410 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this 300-410 question test?

Control Plane Policing (CoPP) — This question tests Control Plane Policing (CoPP) — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The CoPP policy is not matching any packets for the CoPP-ICMP and CoPP-SSH classes. — The output shows the CoPP policy applied to the control plane. The class-default has traffic, but the specific classes (ICMP and SSH) show zero packets, indicating the access-lists may not be matching traffic or the class-maps are not correctly configured. The correct answer is that the CoPP policy is not matching any packets for the defined classes.

What should I do if I get this 300-410 question wrong?

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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