350-501 Networking Practice Question
A service provider is implementing 6PE to carry IPv6 traffic over an existing MPLS IPv4 core. Which BGP extension is required on the provider edge (PE) routers to exchange IPv6 prefixes with an IPv4 next-hop?
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
✓
MP-BGP for the IPv6 address family with an IPv4 next-hop encoded in the MP_REACH_NLRI
6PE uses BGP multiprotocol extensions (MP-BGP) with the IPv6 Address Family Identifier (AFI) and subsequent AFI (SAFI) to carry IPv6 prefixes. The next-hop is encoded as an IPv4 address using the 'next-hop' attribute with an IPv4 address. This is done via MP_REACH_NLRI for IPv6 with an IPv4 next-hop.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BGP IPv6 unicast address family with IPv6 next-hop
Why it's wrong here
6PE uses IPv4 next-hop, not IPv6.
- ✗
BGP IPv4 unicast address family with the IPv6 prefix as a label
Why it's wrong here
That is not how 6PE works; it uses MP-BGP for IPv6.
- ✗
BGP VPNv4 address family
Why it's wrong here
VPNv4 is for MPLS L3VPN, not 6PE.
- ✓
MP-BGP for the IPv6 address family with an IPv4 next-hop encoded in the MP_REACH_NLRI
Why this is correct
Correct. 6PE uses MP-BGP to advertise IPv6 prefixes with an IPv4 next-hop.
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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.