- A
ACLs are used in CoPP class-maps to match specific control-plane traffic types.
Correct because CoPP uses class-maps that reference ACLs to identify traffic such as SSH, SNMP, or routing protocol packets.
- B
CoPP can rate-limit ICMP packets destined to the router by using an ACL to match ICMP in the class-map.
Correct because an ACL can match ICMP traffic, and CoPP can apply a police action to limit its rate to the control plane.
- C
ACLs applied to interfaces take precedence over CoPP policies for control-plane traffic.
Why wrong: Incorrect because CoPP is applied to the control plane itself; interface ACLs affect traffic before it reaches the control plane, but CoPP is the final arbiter for control-plane-bound packets.
- D
CoPP can only use extended ACLs, not standard ACLs, for classification.
Why wrong: Incorrect because CoPP can use both standard and extended ACLs, though extended ACLs are more common for granularity.
- E
CoPP policies are applied globally and affect all traffic entering the router, including transit traffic.
Why wrong: Incorrect because CoPP only affects traffic destined to the control plane, not transit traffic.
Quick Answer
The answer is that CoPP can rate-limit ICMP packets destined to the router by using an ACL to match ICMP in the class-map. This is correct because ACLs serve as the classification mechanism within a CoPP policy, identifying specific control-plane traffic—such as ICMP, SSH, or BGP—by matching packet headers before the router applies a policing action. On the ENCOR 350-401 exam, this concept tests your understanding that CoPP uses ACLs to filter traffic destined for the control plane, not transit traffic, and that the class-map defines the match criteria while the policy-map enforces the rate-limit. A common trap is confusing the order of processing: ACLs are applied inside the class-map, not before CoPP, and CoPP does not inspect data-plane forwarding. Remember the mnemonic "ACL in Class, Police in Policy" to keep the hierarchy straight.
CCNP ACLs and CoPP Practice Question
This 350-401 practice question tests your understanding of acls and copp. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which two statements about the interaction between ACLs and CoPP are true? (Choose two.)
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
ACLs are used in CoPP class-maps to match specific control-plane traffic types.
ACLs are used within CoPP to classify control-plane traffic. CoPP can protect against DoS attacks, and ACLs provide the classification. The incorrect options misstate the order of processing or the scope of CoPP.
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.
- ✓
ACLs are used in CoPP class-maps to match specific control-plane traffic types.
- ✓
CoPP can rate-limit ICMP packets destined to the router by using an ACL to match ICMP in the class-map.
- ✗
ACLs applied to interfaces take precedence over CoPP policies for control-plane traffic.
Why it's wrong here
Incorrect because CoPP is applied to the control plane itself; interface ACLs affect traffic before it reaches the control plane, but CoPP is the final arbiter for control-plane-bound packets.
- ✗
CoPP can only use extended ACLs, not standard ACLs, for classification.
Why it's wrong here
Incorrect because CoPP can use both standard and extended ACLs, though extended ACLs are more common for granularity.
- ✗
CoPP policies are applied globally and affect all traffic entering the router, including transit traffic.
Why it's wrong here
Incorrect because CoPP only affects traffic destined to the control plane, not transit traffic.
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.
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.
- →
ACLs and CoPP — study guide chapter
Learn the concepts, then practise the questions
- →
ACLs and CoPP practice questions
Targeted practice on this topic area only
- →
All 350-401 questions
2,015 questions across all exam domains
- →
ENCOR 350-401 study guide
Full concept coverage aligned to exam objectives
- →
350-401 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
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.
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: ACLs are used in CoPP class-maps to match specific control-plane traffic types. — ACLs are used within CoPP to classify control-plane traffic. CoPP can protect against DoS attacks, and ACLs provide the classification. The incorrect options misstate the order of processing or the scope of CoPP.
What should I do if I get this 350-401 question wrong?
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.
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 →
Last reviewed: Jun 18, 2026
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.
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.
Sign in to join the discussion.