350-501 Security and Services Practice Question
In an MPLS L3VPN network, which security measure should be taken on PE-CE links to prevent MPLS label spoofing?
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
✓
Disable MPLS on the PE-CE link
Disabling MPLS on the PE-CE link ensures that the customer cannot send labeled packets into the MPLS core, preventing label spoofing. Additionally, disabling TTL propagation can hide the core topology but does not prevent spoofing.
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 OAM
Why it's wrong here
OAM is for fault detection, not security.
- ✗
Use BGP prefix filtering
Why it's wrong here
Prefix filtering does not prevent label spoofing.
- ✗
Enable TTL propagation
Why it's wrong here
TTL propagation does not prevent label spoofing.
- ✓
Disable MPLS on the PE-CE link
Why this is correct
This prevents customer from injecting labeled packets.
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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.