Question 418 of 2,015

ACLs and CoPP →hardMultiple ChoiceObjective-mapped

350-401 ACLs and CoPP Practice Question

This 350-401 practice question tests your understanding of acls and 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-POLICY

Class-map: MGMT-CLASS (match-all) 100 packets, 5000 bytes 5 minute offered rate 1000 bps Match: access-group name MGMT-ACL police: cir 32000 bps, bc 4000 bytes, be 4000 bytes conformed 80 packets, 4000 bytes; actions: transmit exceeded 15 packets, 750 bytes; actions: drop violated 5 packets, 250 bytes; actions: drop

Class-map: class-default (match-any) 200 packets, 10000 bytes 5 minute offered rate 2000 bps Match: any police: cir 64000 bps, bc 8000 bytes, be 8000 bytes conformed 200 packets, 10000 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop

Based on this output, what can be concluded?

Question 1hardmultiple choice

Study the full ACL explanation →

A
Management traffic to the control plane is being policed, and some packets are being dropped because they exceed the configured rate.
The policer shows 80 conformed and 20 exceeded/violated packets, meaning 20 packets were dropped due to exceeding the CIR.
B
All management traffic is being transmitted without drops.
Why wrong: 20 packets were dropped, so not all are transmitted.
C
The policer is configured in the output direction.
Why wrong: The service-policy is input, so it is inbound.
D
The class-default is dropping packets.
Why wrong: The class-default shows all 200 packets conformed, so no drops.

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

✓

Management traffic to the control plane is being policed, and some packets are being dropped because they exceed the configured rate.

The MGMT class has a CIR of 32 kbps. Out of 100 packets, 80 conformed and were transmitted, while 20 exceeded or violated and were dropped. This indicates that the traffic rate exceeded the policer's CIR, causing drops. The correct answer is that management traffic to the control plane is being policed, and some packets are being dropped because they exceed the configured rate.

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.

✓
Management traffic to the control plane is being policed, and some packets are being dropped because they exceed the configured rate.
Why this is correct
The policer shows 80 conformed and 20 exceeded/violated packets, meaning 20 packets were dropped due to exceeding the CIR.
Related concept
Standard ACLs match source addresses.
✗
All management traffic is being transmitted without drops.
Why it's wrong here
20 packets were dropped, so not all are transmitted.
✗
The policer is configured in the output direction.
Why it's wrong here
The service-policy is input, so it is inbound.
✗
The class-default is dropping packets.
Why it's wrong here
The class-default shows all 200 packets conformed, so no drops.

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 class-default shows all 200 packets conformed, so no drops.

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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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: Management traffic to the control plane is being policed, and some packets are being dropped because they exceed the configured rate. — The MGMT class has a CIR of 32 kbps. Out of 100 packets, 80 conformed and were transmitted, while 20 exceeded or violated and were dropped. This indicates that the traffic rate exceeded the policer's CIR, causing drops. The correct answer is that management traffic to the control plane is being policed, and some packets are being dropped because they exceed the configured rate.

What should I do if I get this 350-401 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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