350-501 Architecture Practice Question
Which THREE of the following are key components of an MPLS L3VPN architecture? (Choose three.)
⚠ Common exam trap
Cisco often tests the misconception that P routers must hold VPN routing information, but in reality P routers only perform label switching and have no awareness of customer VPN prefixes.
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
✓
VRF on PE routers
VRF (Virtual Routing and Forwarding) on PE routers is a key component because it isolates customer routing tables and forwarding planes within the provider edge, allowing multiple customers to share the same physical infrastructure while maintaining separate routing domains. Each VRF maintains its own routing table, CEF (Cisco Express Forwarding) table, and associated interfaces, which is fundamental to L3VPN separation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RSVP-TE for traffic engineering
Why it's wrong here
RSVP-TE is optional and not a key component of basic L3VPN.
- ✓
VRF on PE routers
Why this is correct
VRF provides per-VPN routing.
- ✓
LDP for label distribution in the core
Why this is correct
LDP is commonly used to distribute labels for the MPLS core.
- ✗
P routers with full VPN routing tables
Why it's wrong here
P routers have no VPN awareness.
- ✓
MP-BGP for VPNv4 route exchange
Why this is correct
MP-BGP carries VPNv4 routes with route distinguishers.
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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.