mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Examine the following CoPP configuration on a…
Examine the following CoPP configuration on a Cisco IOS-XE router:
!--- ACL to match traffic
access-list 100 permit tcp any any eq 22 access-list 100 permit tcp any any eq 23 access-list 100 permit icmp any any echo
! !--- Class-map class-map match-all COPP-MGMT match access-group 100 ! !--- Policy-map policy-map COPP-POLICY
class COPP-MGMT
police 8000 conform-action transmit exceed-action drop
class class-default
police 64000 conform-action transmit exceed-action drop ! !--- Apply to control-plane control-plane service-policy input COPP-POLICY
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the misconception that ICMP echo is not matched by ACL 100 because it uses the 'echo' keyword rather than a port number, but 'echo' is a valid ICMP type that matches ping requests, so candidates may incorrectly assume only TCP traffic is affected.
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
✓
SSH, Telnet, and ICMP echo packets are rate-limited to 8000 bps; all other control-plane traffic is rate-limited to 64000 bps.
The CoPP configuration matches SSH (TCP/22), Telnet (TCP/23), and ICMP echo (ping) traffic via ACL 100 and class-map COPP-MGMT, then applies a police rate of 8000 bps to that class. All other control-plane traffic falls into class-default and is policed at 64000 bps. The 'conform-action transmit exceed-action drop' statements enforce rate-limiting, not blocking, so the correct effect is that SSH, Telnet, and ICMP echo are rate-limited to 8000 bps, while all other control-plane traffic is rate-limited to 64000 bps.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
SSH, Telnet, and ICMP echo packets are rate-limited to 8000 bps; all other control-plane traffic is rate-limited to 64000 bps.
Why this is correct
Correct. The class COPP-MGMT matches the ACL traffic and applies a 8000 bps policer. The class-default applies a 64000 bps policer to all other traffic.
- ✗
Only SSH and Telnet are rate-limited to 8000 bps; ICMP echo is not affected because it is matched by a different class.
Why it's wrong here
Incorrect. The ACL includes ICMP echo, so it is also matched by class COPP-MGMT.
- ✗
All control-plane traffic is rate-limited to 64000 bps, because the class-default overrides the COPP-MGMT class.
Why it's wrong here
Incorrect. The COPP-MGMT class is matched first and applies its own policer. Class-default only applies to traffic not matching any explicit class.
- ✗
The configuration is invalid because the class-map must be named 'COPP-CLASS' to be used in the policy-map.
Why it's wrong here
Incorrect. The class-map name 'COPP-MGMT' is valid and properly referenced in the policy-map.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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