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An engineer must implement protection against ICMP DoS attacks on a Cisco Nexus 9000 Series Switch. The requirement is to rate-limit ICMP without denying all other ICMP traffic. The ICMP trafic currently passing through the Cisco Nexus 9000 device must not be affected. Which configuration accomplishes these goals?

A.

Configure SNMP traps to send the ICMP notification if the CPU utilization is more than 90%.

Answers
A.

Configure SNMP traps to send the ICMP notification if the CPU utilization is more than 90%.

B.

Reconfigure the Layer 3 interfaces to be in the non-default VRF and ICMP broadcast storm control

Answers
B.

Reconfigure the Layer 3 interfaces to be in the non-default VRF and ICMP broadcast storm control

C.

Create an access list to deny ICMP traffic and apply it to all interlaces in the inside direction.

Answers
C.

Create an access list to deny ICMP traffic and apply it to all interlaces in the inside direction.

D.

Apply a control plane service policy that matches all ICMP traffic to drop the traffic fiat exceeds the threshold.

Answers
D.

Apply a control plane service policy that matches all ICMP traffic to drop the traffic fiat exceeds the threshold.

Suggested answer: D

Explanation:

Applying a control plane service policy with a rate-limiting feature allows the engineer to match all ICMP traffic and set a threshold for it. Traffic that exceeds this threshold can be dropped, thus mitigating the risk of ICMP-based DoS attacks while allowing legitimate ICMP traffic to pass through.This method ensures that the current ICMP traffic is not affected as long as it does not exceed the configured rate limit12.

asked 10/10/2024
Neville Raposo
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