mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Examine this CoPP configuration: ip access-list…
Examine this CoPP configuration:
ip access-list extended COPP-ACL permit tcp any any eq 22 permit tcp any any eq
23
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?
⚠ Common exam trap
Cisco often tests the distinction between the normal burst (Bc) and excess burst (Be) parameters, where candidates mistakenly sum them or assume the second parameter is a time interval, leading to incorrect burst size calculations.
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 in class COPP-CLASS uses a committed information rate (CIR) of 10000 bps, a normal burst (Bc) of 1500 bytes, and an excess burst (Be) of 1500 bytes. The conform-action transmit, exceed-action drop, and violate-action drop ensure that any traffic exceeding the rate and burst limits is dropped, effectively limiting the matched traffic (SSH, Telnet, ICMP echo) to 10000 bps with a burst of 1500 bytes.
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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