Question 1mediumdrag order
Study the full ACL explanation →Question 137 of 2,015
Quick Answer
The correct order for configuring Control Plane Policing (CoPP) on a Cisco IOS router is: define an access-list, create a class-map, create a policy-map, apply the policy-map to the control plane inbound, and then verify with show policy-map control-plane. This sequence is necessary because CoPP protects the control plane by filtering traffic before it reaches the CPU; you must first identify the traffic of interest with an access-list, then group that traffic into a class-map, assign a policing action (rate-limit) in a policy-map, and finally attach that policy to the control plane interface. On the ENCOR 350-401 exam, this drag-and-drop task tests your understanding of the modular QoS CLI (MQC) workflow applied specifically to the control plane, and a common trap is applying the policy-map to an interface instead of the control plane itself. A reliable memory tip is to think of the acronym "ACPV" — Access-list, Class-map, Policy-map, Verify — which mirrors the logical build-up from matching traffic to enforcing and checking the policy.
350-401 Infrastructure Security Practice Question
This 350-401 practice question tests your understanding of infrastructure security. 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.
Drag and drop the steps of configuring Control Plane Policing (CoPP) on a Cisco IOS router into the correct order, from first to last.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Create access-list to match control plane traffic
CoPP protects the control plane by filtering traffic. First, define an access-list to match the traffic of interest (e.g., SSH, BGP). Second, create a class-map to reference the access-list. Third, create a policy-map that assigns a police action (rate-limit) to the class. Fourth, apply the policy-map to the control plane in the inbound direction. Finally, verify the policy with show commands to ensure correct operation.
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.
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.
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FAQ
Questions learners often ask
What does this 350-401 question test?
Infrastructure Security — This question tests Infrastructure Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create access-list to match control plane traffic — CoPP protects the control plane by filtering traffic. First, define an access-list to match the traffic of interest (e.g., SSH, BGP). Second, create a class-map to reference the access-list. Third, create a policy-map that assigns a police action (rate-limit) to the class. Fourth, apply the policy-map to the control plane in the inbound direction. Finally, verify the policy with show commands to ensure correct operation.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Same concept, more angles
2 more ways this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the steps of Control Plane Policing (CoPP) rate-limit evaluation into the correct order, from first to last.
medium- ✓ A.Define access list to match control plane traffic
- ✓ B.Create class map referencing the access list
- ✓ C.Configure policy map with police rate and action
- ✓ D.Apply policy map to control plane service policy
- ✓ E.Hardware forwards or drops based on rate limit
Why A: CoPP first classifies traffic using an access list, then matches it to a class map, then applies a policy map with a police action (rate-limit), activates the policy on the control plane, and finally the hardware performs policing.
Variation 2. Drag and drop the steps of Control Plane Policing (CoPP) rate-limit evaluation into the correct order, from first to last.
medium- ✓ A.Configure class-map to match control plane traffic
- ✓ B.Define policy-map with class-map and rate-limit action
- ✓ C.Apply policy-map to control-plane service policy
- ✓ D.Router evaluates packet against class-map criteria
- ✓ E.Rate-limit action drops or polices exceeding traffic
Why A: CoPP evaluates packets by first classifying them into a class-map, then applying the policy-map to the control plane, which specifies the rate-limit action. The order ensures that classification happens before rate-limiting, and the final step is the action taken when the rate is exceeded.
Keep practising
More 350-401 practice questions
- Drag and drop the steps to configure an extended access control list (ACL) on a Cisco router in the correct order.
- Drag and drop the steps to configure a site-to-site IPsec VPN on a Cisco router in the correct order.
- Drag and drop the steps to configure VLAN Trunking Protocol (VTP) on a Cisco switch in the correct order.
- Drag and drop the steps to configure a static route on a Cisco IOS router into the correct order.
- Drag and drop the steps to configure port security on a Cisco switch in the correct order.
- Drag and drop the steps for the Spanning Tree Protocol (STP) convergence process in the correct order.
Last reviewed: Jun 18, 2026
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