350-501 Networking Practice Question
An ISP is implementing 6PE for IPv6 transport over MPLS. Which two conditions are required for 6PE to work? (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
✓
BGP multiprotocol extensions for IPv6
6PE requires BGP to carry IPv6 prefixes with an IPv4 next-hop (MPLS label), and the core MPLS network must support IPv4 LSPs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IPv6 MPLS LSPs in the core
Why it's wrong here
Core uses IPv4 LSPs; IPv6 is transported over IPv4 MPLS.
- ✓
BGP multiprotocol extensions for IPv6
Why this is correct
BGP must carry IPv6 address family.
- ✗
IPv6 next-hop in BGP updates
Why it's wrong here
6PE uses IPv4 next-hop for the MPLS LSP.
- ✓
MPLS forwarding with labels for IPv6 prefixes
Why this is correct
PE routers assign labels to IPv6 routes.
- ✗
6PE requires 6VPE
Why it's wrong here
6PE does not require 6VPE; 6VPE adds per-VRF IPv6 transport and MPLS VPN separation, which is unnecessary for the ISP’s basic 6PE goal of forwarding native IPv6 over an MPLS core without VPN context. The option is tempting because 6VPE extends 6PE to support MPLS L3VPNs for IPv6, making it correct only when the scenario demands isolated customer VPN routing, not simple IPv6 transport.
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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.