Question 343 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: ICMP-CLASS (match-all) 10 packets, 1000 bytes 5 minute offered rate 0 bps Match: access-group name ICMP-ACL police: cir 8000 bps, bc 1500 bytes, be 1500 bytes conformed 10 packets, 1000 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop

Class-map: SSH-CLASS (match-all) 5 packets, 500 bytes 5 minute offered rate 0 bps Match: access-group name SSH-ACL police: cir 16000 bps, bc 3000 bytes, be 3000 bytes conformed 5 packets, 500 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop

Class-map: class-default (match-any) 20 packets, 2000 bytes 5 minute offered rate 0 bps Match: any police: cir 64000 bps, bc 8000 bytes, be 8000 bytes conformed 20 packets, 2000 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
ICMP traffic to the control plane is rate-limited to 8 kbps, and all packets so far have been within the conform rate.
The police command shows a CIR of 8000 bps for ICMP, and the conformed count equals the total packets, meaning no packets exceeded the rate.
B
SSH traffic to the control plane is being dropped because it exceeds the CIR.
Why wrong: The SSH class shows 5 conformed packets and 0 exceeded/dropped, so no drops.
C
The control-plane policy is applied in the output direction.
Why wrong: The output shows 'input' in the service-policy line, so it is applied inbound.
D
All traffic to the control plane is rate-limited to 64 kbps.
Why wrong: The class-default has a CIR of 64 kbps, but specific classes like ICMP and SSH have their own lower limits.

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

✓

ICMP traffic to the control plane is rate-limited to 8 kbps, and all packets so far have been within the conform rate.

The output shows a CoPP policy applied to the control plane. The ICMP class has a CIR of 8 kbps, and all 10 ICMP packets conformed. The SSH class has a higher CIR of 16 kbps. The class-default has a CIR of 64 kbps. The correct answer is that ICMP traffic to the control plane is rate-limited to 8 kbps, and all packets so far have been within the conform 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.

✓
ICMP traffic to the control plane is rate-limited to 8 kbps, and all packets so far have been within the conform rate.
Why this is correct
The police command shows a CIR of 8000 bps for ICMP, and the conformed count equals the total packets, meaning no packets exceeded the rate.
Related concept
Standard ACLs match source addresses.
✗
SSH traffic to the control plane is being dropped because it exceeds the CIR.
Why it's wrong here
The SSH class shows 5 conformed packets and 0 exceeded/dropped, so no drops.
✗
The control-plane policy is applied in the output direction.
Why it's wrong here
The output shows 'input' in the service-policy line, so it is applied inbound.
✗
All traffic to the control plane is rate-limited to 64 kbps.
Why it's wrong here
The class-default has a CIR of 64 kbps, but specific classes like ICMP and SSH have their own lower limits.

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 SSH class shows 5 conformed packets and 0 exceeded/dropped, 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.

Related 350-401 practice-question pages

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

Architecture practice questions

Practise 350-401 questions linked to Architecture.

Enterprise Network Design practice questions

Practise 350-401 questions linked to Enterprise Network Design.

SD-Access Architecture practice questions

Practise 350-401 questions linked to SD-Access Architecture.

SD-WAN Architecture practice questions

Practise 350-401 questions linked to SD-WAN Architecture.

QoS Architecture practice questions

Practise 350-401 questions linked to QoS Architecture.

Virtualization practice questions

Practise 350-401 questions linked to Virtualization.

Network Function Virtualization practice questions

Practise 350-401 questions linked to Network Function Virtualization.

Virtual Machines and Hypervisors practice questions

Practise 350-401 questions linked to Virtual Machines and Hypervisors.

VRF and Path Isolation practice questions

Practise 350-401 questions linked to VRF and Path Isolation.

Infrastructure practice questions

Practise 350-401 questions linked to Infrastructure.

OSPF practice questions

Practise 350-401 questions linked to OSPF.

BGP practice questions

Practise 350-401 questions linked to BGP.

Practice this exam

Start a free 350-401 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

350-401 practice-test guide →Study guide →Browse all practice tests

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: ICMP traffic to the control plane is rate-limited to 8 kbps, and all packets so far have been within the conform rate. — The output shows a CoPP policy applied to the control plane. The ICMP class has a CIR of 8 kbps, and all 10 ICMP packets conformed. The SSH class has a higher CIR of 16 kbps. The class-default has a CIR of 64 kbps. The correct answer is that ICMP traffic to the control plane is rate-limited to 8 kbps, and all packets so far have been within the conform 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.

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 350-401 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 350-401 exam.