Question 878 of 2,152

Control Plane Policing (CoPP) →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct solution is to create a separate class for legitimate SSH traffic from the management network with a higher police rate, while policing the attacker’s traffic more aggressively. This is necessary because the current CoPP policy applies a single rate-limit to all TCP port 22 traffic, which cannot distinguish between malicious SSH login attempts and legitimate management sessions. By implementing a more granular class-map that matches only the attacker’s source IP addresses or by classifying traffic from the trusted management subnet with a higher police rate, the engineer achieves selective SSH rate-limiting without dropping authorized connections. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of Control Plane Policing granularity and the importance of using ACLs or object-groups within class-maps to differentiate traffic flows. A common trap is assuming a single police rate for a protocol is sufficient, but the exam emphasizes that CoPP policies must be source-aware to preserve legitimate access. Memory tip: “One rate for all will drop the ball—separate the good from the bad to keep the network glad.”

300-410 Control Plane Policing (CoPP) Practice Question

This 300-410 practice question tests your understanding of control plane policing (copp). The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 router experiences high CPU utilization due to SSH login attempts from an external attacker. The network engineer implements a CoPP policy to rate-limit SSH traffic to 10000 bps. After applying the policy, the engineer notices that legitimate SSH sessions from the management network are also being dropped intermittently. The CoPP policy uses a class-map that matches TCP port 22 traffic. What should the engineer do to fix this issue?

Question 1mediummultiple choice

Study the full ACL explanation →

A
Increase the police rate for the SSH class to 100000 bps to allow all SSH traffic.
Why wrong: This would allow the attacker's traffic as well, defeating the purpose of CoPP and potentially still causing high CPU.
B
Modify the class-map to match only SSH traffic from the attacker's source IP addresses using an access-list.
Why wrong: The goal is to block the attacker, not match them. The engineer should match legitimate sources and police the attacker separately.
C
Create a separate class for legitimate SSH traffic from the management network with a higher police rate, and police the attacker's traffic more aggressively.
This allows legitimate SSH sessions to pass while still protecting the control plane from the attacker.
D
Remove the CoPP policy and implement an ACL on the interface to block the attacker's IP address.
Why wrong: This is a valid alternative but does not fix the CoPP issue; the question asks what to do to fix the issue with the current CoPP policy.

Full breakdown with real-world context →

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

✓

Create a separate class for legitimate SSH traffic from the management network with a higher police rate, and police the attacker's traffic more aggressively.

The CoPP policy is rate-limiting all SSH traffic, including legitimate sessions. The engineer should create a more specific class-map that matches only the attacker's source IP addresses or uses a more granular approach, such as matching traffic from the management network with a higher police rate.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Increase the police rate for the SSH class to 100000 bps to allow all SSH traffic.
Why it's wrong here
This would allow the attacker's traffic as well, defeating the purpose of CoPP and potentially still causing high CPU.
✗
Modify the class-map to match only SSH traffic from the attacker's source IP addresses using an access-list.
Why it's wrong here
The goal is to block the attacker, not match them. The engineer should match legitimate sources and police the attacker separately.
✓
Create a separate class for legitimate SSH traffic from the management network with a higher police rate, and police the attacker's traffic more aggressively.
Why this is correct
This allows legitimate SSH sessions to pass while still protecting the control plane from the attacker.
Related concept
Standard ACLs match source addresses.
✗
Remove the CoPP policy and implement an ACL on the interface to block the attacker's IP address.
Why it's wrong here
This is a valid alternative but does not fix the CoPP issue; the question asks what to do to fix the issue with the current CoPP policy.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

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

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.

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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) — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Create a separate class for legitimate SSH traffic from the management network with a higher police rate, and police the attacker's traffic more aggressively. — The CoPP policy is rate-limiting all SSH traffic, including legitimate sessions. The engineer should create a more specific class-map that matches only the attacker's source IP addresses or uses a more granular approach, such as matching traffic from the management network with a higher police rate.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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