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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
The class-map matches SSH, Telnet, and ICMP echo, and its police action caps that traffic at 8000 bps, dropping excess. The class-default police statement rate-limits all remaining control-plane traffic to 64000 bps, so management protocols are throttled more tightly than other control-plane packets.
- ✗
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
The class-map uses match-all with a single access-group, so SSH, Telnet and ICMP echo all map to COPP-MGMT and share the 8000 bps policer. ICMP echo is not excluded; it is matched by access-list 100 and therefore rate-limited alongside the management protocols.
- ✗
All control-plane traffic is rate-limited to 64000 bps, because the class-default overrides the COPP-MGMT class.
Why it's wrong here
Class-default polices only traffic not matched by earlier classes; SSH, Telnet and ICMP echo match COPP-MGMT and receive the 8000 bps limit instead. It is tempting because class-default appears last and carries the higher rate, but policy-map classes are evaluated independently, not overridden by later entries.
- ✗
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
Class-map names are locally significant; any name matching the policy-map reference works, so COPP-MGMT is valid and the configuration applies. It is tempting because reserved or predefined names exist elsewhere in IOS, but CoPP imposes no naming convention, making this a fabricated restriction rather than a real syntax rule.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.