- A
SSH, Telnet, and ICMP echo packets are rate-limited to 8000 bps; all other control-plane traffic is rate-limited to 64000 bps.
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.
- B
Only SSH and Telnet are rate-limited to 8000 bps; ICMP echo is not affected because it is matched by a different class.
Why wrong: Incorrect. The ACL includes ICMP echo, so it is also matched by class COPP-MGMT.
- C
All control-plane traffic is rate-limited to 64000 bps, because the class-default overrides the COPP-MGMT class.
Why wrong: Incorrect. The COPP-MGMT class is matched first and applies its own policer. Class-default only applies to traffic not matching any explicit class.
- D
The configuration is invalid because the class-map must be named 'COPP-CLASS' to be used in the policy-map.
Why wrong: Incorrect. The class-map name 'COPP-MGMT' is valid and properly referenced in the policy-map.
CoPP Configuration Interpretation
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 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?
Quick Answer
The answer is that SSH, Telnet, and ICMP echo packets are rate-limited to 8000 bps, while all other control-plane traffic is rate-limited to 64000 bps. This is correct because the CoPP configuration interpretation hinges on the class-map matching access-list 100, which selects TCP ports 22 and 23 along with ICMP echo, and the policy-map applies a police rate of 8000 bps to that class, dropping any excess traffic. The class-default then catches all remaining control-plane traffic and limits it to a higher 64000 bps, ensuring that critical management protocols are throttled more aggressively than general traffic. On the Cisco CCNP ENARSI 300-410 exam, this tests your ability to read a CoPP policy and understand that the police command sets a committed information rate (CIR) in bits per second, not packets per second—a common trap where candidates misread the unit. A helpful memory tip: "Management gets the smaller pipe; everything else gets the bigger pipe."
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Only SSH and Telnet are rate-limited to 8000 bps; ICMP echo is not affected because it is matched by a different class.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
CoPP uses a hierarchical QoS model where the control-plane is treated as a virtual interface; the service-policy is applied under the 'control-plane' configuration, and packets are classified before they reach the CPU. The police command uses a single-rate two-color policer by default, and the 'exceed-action drop' ensures that traffic exceeding the committed information rate (CIR) is discarded, protecting the CPU from overload. In real-world scenarios, misconfiguring the police rate too low for management protocols like SSH can cause lockouts, so careful planning of CIR values is critical.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
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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) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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