Question 1,358 of 2,152

Control Plane Policing (CoPP) →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that traffic matching class COPP-CLASS is limited to 10000 bps with a burst of 1500 bytes, and any excess traffic is dropped. This is correct because the police command in a CoPP policy-map specifies a conform rate of 10000 bits per second, a normal burst of 1500 bytes, and an excess burst of 1500 bytes; when traffic exceeds the burst threshold, the exceed-action drop and violate-action drop parameters ensure all non-conforming packets are discarded. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of how Control Plane Policing (CoPP) uses burst values to protect the router’s control plane from DoS attacks while allowing legitimate traffic like SSH, Telnet, and ICMP echo. A common trap is confusing the normal burst with the excess burst—here they are equal, meaning no second token bucket is used, so any traffic beyond the initial 1500-byte burst is immediately dropped. Remember the mnemonic “C-E-V” for conform, exceed, violate—if both exceed and violate actions are set to drop, the burst is a hard limit.

300-410 Control Plane Policing (CoPP) Practice Question

This 300-410 practice question tests your understanding of control plane policing (copp). 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 this CoPP configuration:

ip access-list extended COPP-ACL
 permit tcp any any eq 22
 permit tcp any any eq

permit icmp any any echo

! class-map match-all COPP-CLASS match access-group name COPP-ACL ! policy-map COPP-POLICY

class COPP-CLASS

police 10000 1500 1500 conform-action transmit exceed-action drop violate-action drop

class class-default

police 64000 conform-action transmit exceed-action drop ! control-plane service-policy input COPP-POLICY

What is the effect of the police command in class COPP-CLASS?

Question 1mediummultiple choice

Study the full ACL explanation →

A
Traffic is limited to 10000 bps with a burst of 1500 bytes; excess traffic is dropped.
Correct. The police command specifies conform rate 10000 bps, normal burst 1500, excess burst 1500. Exceed and violate actions are both drop.
B
Traffic is limited to 10000 bps with a burst of 3000 bytes; excess traffic is dropped.
Why wrong: Incorrect. The excess burst is 1500 bytes, not 3000. The normal burst and excess burst are separate parameters.
C
The police command is invalid because it uses three parameters after the rate.
Why wrong: Incorrect. The police command can include conform rate, normal burst, and excess burst. The syntax is valid.
D
Traffic is limited to 10000 bps, but the burst values are ignored because they are not configured in bytes.
Why wrong: Incorrect. The burst values are in bytes and are used by the token bucket algorithm.

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

✓

Traffic is limited to 10000 bps with a burst of 1500 bytes; excess traffic is dropped.

The police command uses a conform rate of 10000 bps, a normal burst of 1500 bytes, and an excess burst of 1500 bytes. Traffic exceeding the burst is dropped (exceed-action drop and violate-action drop).

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 is limited to 10000 bps with a burst of 1500 bytes; excess traffic is dropped.
Why this is correct
Correct. The police command specifies conform rate 10000 bps, normal burst 1500, excess burst 1500. Exceed and violate actions are both drop.
Related concept
Standard ACLs match source addresses.
✗
Traffic is limited to 10000 bps with a burst of 3000 bytes; excess traffic is dropped.
Why it's wrong here
Incorrect. The excess burst is 1500 bytes, not 3000. The normal burst and excess burst are separate parameters.
✗
The police command is invalid because it uses three parameters after the rate.
Why it's wrong here
Incorrect. The police command can include conform rate, normal burst, and excess burst. The syntax is valid.
✗
Traffic is limited to 10000 bps, but the burst values are ignored because they are not configured in bytes.
Why it's wrong here
Incorrect. The burst values are in bytes and are used by the token bucket algorithm.

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
Incorrect. The police command can include conform rate, normal burst, and excess burst. The syntax is valid.

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 300-410 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this 300-410 question test?

Control Plane Policing (CoPP) — This question tests Control Plane Policing (CoPP) — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Traffic is limited to 10000 bps with a burst of 1500 bytes; excess traffic is dropped. — The police command uses a conform rate of 10000 bps, a normal burst of 1500 bytes, and an excess burst of 1500 bytes. Traffic exceeding the burst is dropped (exceed-action drop and violate-action drop).

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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