350-501 Security and Services Practice Question
A service provider wants to protect its core routers from CPU exhaustion caused by excessive ICMP traffic. Which control plane protection mechanism on IOS XR would be most appropriate to rate-limit ICMP packets destined to the router?
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
✓
Implement CoPP by creating a class-map for ICMP and applying a police rate under a control-plane policy-map
CoPP (Control Plane Policing) on IOS XR uses class maps and policy maps to classify and rate-limit control plane traffic, including ICMP. ACL-based policing is less granular, and MPLS TE or BGP prefix filtering do not apply.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable MPLS traffic engineering to reroute ICMP
Why it's wrong here
MPLS TE is for traffic engineering, not control plane protection.
- ✗
Use BGP prefix filtering to block ICMP routes
Why it's wrong here
BGP prefix filtering is for routing updates, not for ICMP traffic.
- ✓
Implement CoPP by creating a class-map for ICMP and applying a police rate under a control-plane policy-map
Why this is correct
CoPP allows granular classification and rate-limiting of control plane traffic.
- ✗
Configure an ACL to deny ICMP on all interfaces
Why it's wrong here
This would block all ICMP, which is too restrictive and not a recommended practice.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 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 350-501 exam.