350-501 Security and Services Practice Question
A service provider wants to protect its core routers from control plane attacks. Which two mechanisms are effective in mitigating such attacks on IOS XR? (Choose two.)
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
✓
Unicast Reverse Path Forwarding (uRPF)
CoPP polices control plane traffic. uRPF prevents spoofed source IPs, which are often used in attacks. BGP prefix filtering is for routing updates, not control plane attacks. MPLS TTL propagation is for traceroute. NTP authentication secures time sync.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MPLS TTL propagation
Why it's wrong here
This affects traceroute visibility, not control plane security.
- ✓
Unicast Reverse Path Forwarding (uRPF)
Why this is correct
uRPF drops packets with spoofed source IPs, reducing attack traffic.
- ✓
Control Plane Policing (CoPP)
Why this is correct
CoPP rate-limits control plane traffic.
- ✗
BGP prefix filtering
Why it's wrong here
This filters routing updates, not attack traffic.
- ✗
NTP authentication
Why it's wrong here
NTP authentication secures time synchronization, not control plane attacks.
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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.