350-501 Security and Services Practice Question
To prevent MPLS label spoofing in a Layer 3 VPN, which configuration should be applied on the PE-CE link?
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 PE-CE links (by not enabling MPLS on the interface) prevents the customer from seeing or injecting MPLS labels, thus preventing label spoofing. TTL propagation is used for traceroute but not a primary anti-spoofing measure.
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 TTL propagation
Why it's wrong here
TTL propagation helps with traceroute but does not prevent label spoofing.
- ✗
Configure uRPF on the PE-CE link
Why it's wrong here
uRPF prevents IP spoofing, not label spoofing.
- ✗
Use BGP FlowSpec to filter labels
Why it's wrong here
FlowSpec filters traffic, not labels directly.
- ✓
Disable MPLS on the PE-CE link
Why this is correct
This ensures the customer does not receive MPLS labels, preventing spoofing.
Go deeper
Related to this question
About these practice questions
Courseiva writes every 350-501 question from scratch — 971 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.