350-501 Networking Practice Question
An SP is deploying 6VPE (IPv6 L3VPN). Which BGP extensions are used to carry IPv6 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
✓
AFI=2 (IPv6), SAFI=128 with IPv4 next-hop encoded as IPv6-mapped.
6VPE uses MP-BGP with the IPv6 VPN AFI (AFI=2) and SAFI=128 (MPLS-labeled VPN). The next-hop is an IPv4 address (the PE's loopback) encoded as a mapped IPv6 address, but the VPNv6 address family carries the prefixes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AFI=1 (IPv4), SAFI=128 with IPv6 next-hop.
Why it's wrong here
Incorrect; AFI=2 for IPv6.
- ✗
AFI=2, SAFI=1 (unicast) with MPLS labels.
Why it's wrong here
Unicast SAFI does not carry MPLS labels for VPN.
- ✓
AFI=2 (IPv6), SAFI=128 with IPv4 next-hop encoded as IPv6-mapped.
Why this is correct
Correct. 6VPE uses AFI=2, SAFI=128, and the next-hop is an IPv4 address mapped to IPv6.
- ✗
AFI=1, SAFI=128 with IPv6 VPN prefixes.
Why it's wrong here
AFI=1 is for IPv4, not IPv6.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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