The answer is that traffic matching the ACL is rate-limited to 1 Mbps, with any excess traffic being dropped. This is correct because the CoPP configuration effect applies a policy-map to the control plane interface, using a class-map that references the ACL to identify specific traffic. The police command sets a committed information rate of 1,000,000 bits per second (1 Mbps) with a normal burst size of 200,000 bytes; conforming packets are transmitted, while packets exceeding this rate are discarded. On the ENCOR 350-401 exam, this tests your understanding of how Control Plane Policing protects the router’s CPU from overwhelming traffic, often appearing in scenario-based questions where you must identify the resulting bandwidth limit or the fate of excess packets. A common trap is misreading the police rate as bytes instead of bits, or forgetting that the exceed-action drop is the default for policing. Memory tip: think of CoPP as a “bouncer at 1 Mbps”—if the ACL traffic crowds past that line, it gets kicked out.
CCNP Infrastructure Security Practice Question
This 350-401 practice question tests your understanding of infrastructure security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Examine the following CoPP configuration on a Cisco IOS-XE router:
```
class-map match-all CONTROL-PLANE
match access-group name COPP-ACL
!
policy-map COPP-POLICY
class CONTROL-PLANE
police 1000000 200000 conform-action transmit exceed-action drop
!
control-plane
service-policy input COPP-POLICY
```
What is the effect of this configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Traffic matching the ACL is rate-limited to 1 Mbps; traffic exceeding the rate is dropped.
This applies a policy-map to the control plane that polices traffic matching the class-map. The police command limits traffic to 1 Mbps (1000000 bps) with a normal burst of 200000 bytes; conforming traffic is transmitted, exceeding traffic is dropped.
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.
✓
Traffic matching the ACL is rate-limited to 1 Mbps; traffic exceeding the rate is dropped.
Why this is correct
Correct. The police command enforces a 1 Mbps rate with drop for excess.
Related concept
Standard ACLs match source addresses.
✗
All control plane traffic is rate-limited to 1 Mbps.
Why it's wrong here
Incorrect. Only traffic matching the class-map (via ACL) is affected.
✗
Traffic exceeding 1 Mbps is marked down but still transmitted.
Why it's wrong here
Incorrect. The action is 'drop', not mark.
✗
The policy-map is applied to the data plane, not the control plane.
Why it's wrong here
Incorrect. The 'control-plane' section applies it to the control plane.
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.
Infrastructure Security — This question tests Infrastructure Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Traffic matching the ACL is rate-limited to 1 Mbps; traffic exceeding the rate is dropped. — This applies a policy-map to the control plane that polices traffic matching the class-map. The police command limits traffic to 1 Mbps (1000000 bps) with a normal burst of 200000 bytes; conforming traffic is transmitted, exceeding traffic is dropped.
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.
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