- A
class-map match-all SSH match protocol ssh policy-map COPP class SSH police 1000000 2000 conform-action transmit exceed-action drop
Why wrong: Missing class-default to handle other traffic.
- B
class-map match-all SSH match access-group name SSH_ACL policy-map COPP class SSH police 1000000 2000 conform-action transmit exceed-action drop class class-default police 8000 conform-action transmit exceed-action drop
Why wrong: Matching access-group is valid but uses ACL instead of protocol; also missing class-default definition.
- C
class-map match-all SSH match protocol ssh policy-map COPP class SSH police 1000000 2000 conform-action transmit exceed-action drop class class-default police 8000 conform-action transmit exceed-action drop
Correct: matches SSH protocol, police rate 1Mbps burst 2000, and default police for all other traffic.
- D
class-map match-all SSH match protocol ssh policy-map COPP class SSH police 2000 1000000 conform-action transmit exceed-action drop
Why wrong: Police parameters swapped: rate should be 1000000, burst 2000.
Quick Answer
The correct answer is the configuration using a class-map match-all SSH with match protocol ssh and a policy-map COPP that polices SSH traffic at 1,000,000 bps with a 2000-byte burst, while the class-default polices all other control-plane traffic at 8000 bps. This is correct because the CoPP policy-map configuration must first classify SSH traffic explicitly using the protocol match, then apply a police rate of 1 Mbps with a conform-action to transmit and exceed-action to drop, ensuring SSH is rate-limited but not blocked entirely. The class-default then enforces a default low rate (8000 bps) to drop any other control-plane traffic that exceeds that threshold, which is the standard best practice for protecting the CPU from DoS floods. On the ENCOR 350-401 exam, this tests your understanding of how CoPP uses hierarchical class-maps and policy-maps to prioritize critical protocols while rate-limiting everything else—a common trap is forgetting the class-default or misapplying the police burst value in bytes versus bits. Remember the memory tip: “SSH gets its own lane at 1 Mbps, everything else walks at 8 Kbps.”
CCNP Security Practice Question
This 350-401 practice question tests your understanding of security. 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.
A security engineer is configuring CoPP (Control Plane Policing) on a Cisco router to protect the control plane from DoS attacks. The policy must rate-limit SSH traffic to 1 Mbps with a burst of 2000 bytes, and drop all other traffic destined to the control plane that exceeds a default rate. Which class-map and policy-map configuration is correct?
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
class-map match-all SSH match protocol ssh policy-map COPP class SSH police 1000000 2000 conform-action transmit exceed-action drop class class-default police 8000 conform-action transmit exceed-action drop
Option C is correct because it uses the 'match protocol ssh' class-map to identify SSH traffic, applies a police rate of 1,000,000 bps (1 Mbps) with a burst of 2000 bytes, and includes a class-default with a police rate of 8000 bps to drop all other control-plane traffic exceeding a default rate. This matches the requirement to rate-limit SSH and drop other traffic that exceeds a default rate, which is a common CoPP best practice to protect the control plane.
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.
- ✗
class-map match-all SSH match protocol ssh policy-map COPP class SSH police 1000000 2000 conform-action transmit exceed-action drop
Why it's wrong here
Missing class-default to handle other traffic.
- ✗
class-map match-all SSH match access-group name SSH_ACL policy-map COPP class SSH police 1000000 2000 conform-action transmit exceed-action drop class class-default police 8000 conform-action transmit exceed-action drop
Why it's wrong here
Matching access-group is valid but uses ACL instead of protocol; also missing class-default definition.
- ✓
class-map match-all SSH match protocol ssh policy-map COPP class SSH police 1000000 2000 conform-action transmit exceed-action drop class class-default police 8000 conform-action transmit exceed-action drop
Why this is correct
Correct: matches SSH protocol, police rate 1Mbps burst 2000, and default police for all other traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
class-map match-all SSH match protocol ssh policy-map COPP class SSH police 2000 1000000 conform-action transmit exceed-action drop
Why it's wrong here
Police parameters swapped: rate should be 1000000, burst 2000.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the requirement for a class-default policy in CoPP to drop all other traffic, and the trap here is that candidates may forget that without it, unmatched traffic is permitted by default, or they may confuse the order of police parameters (rate vs. burst).
Detailed technical explanation
How to think about this question
CoPP uses MQC (Modular QoS CLI) to classify and police traffic destined to the control plane. The 'police' command uses a token bucket algorithm where the rate is in bits per second and the burst is in bytes; the default class in CoPP typically uses a very low police rate (e.g., 8000 bps) to drop unexpected traffic, preventing DoS attacks. In real-world scenarios, failing to include a class-default with a drop policy can leave the control plane vulnerable to floods of non-SSH traffic.
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.
What to study next
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FAQ
Questions learners often ask
What does this 350-401 question test?
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: class-map match-all SSH match protocol ssh policy-map COPP class SSH police 1000000 2000 conform-action transmit exceed-action drop class class-default police 8000 conform-action transmit exceed-action drop — Option C is correct because it uses the 'match protocol ssh' class-map to identify SSH traffic, applies a police rate of 1,000,000 bps (1 Mbps) with a burst of 2000 bytes, and includes a class-default with a police rate of 8000 bps to drop all other control-plane traffic exceeding a default rate. This matches the requirement to rate-limit SSH and drop other traffic that exceeds a default rate, which is a common CoPP best practice to protect the control plane.
What should I do if I get this 350-401 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: Jun 11, 2026
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