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352-001 · Question #83
352-001 Question #83: Real Exam Question with Answer & Explanation
The correct answer is A: native IPv6, only for multicast services. MPLS 6PE/6VPE supports only IPv6 unicast, so providing IPv6 multicast requires supplemental solutions - native IPv6 multicast, Layer 2 MPLS overlay tunnels, and MVPN extended for IPv6.
Question
You are the lead IP/MPLS network designer of a service provider called XYZ. You are leading a design discussion regarding IPv6 implementation in the XYZ MPLS network, using MPLS 6PE/6VPE techniques. Currently, XYZ provides IPv4 multicast services over an MPLS network by using MVPN, and would like to provide parallel IPv6 multicast services. Which three multicast solutions should be enabled? (Choose three.)
Options
- Anative IPv6, only for multicast services
- BMPLS 6PE/6VPE, because it provides IPv6 multicast support by default
- Can overlay model using Layer 2 MPLS tunnels
- DPIM-DM to enable IPv6 multicast in conjunction with MPLS 6PE/6VPE
- EMVPN for IPv6 multicast service
Explanation
MPLS 6PE/6VPE supports only IPv6 unicast, so providing IPv6 multicast requires supplemental solutions - native IPv6 multicast, Layer 2 MPLS overlay tunnels, and MVPN extended for IPv6.
Common mistakes.
- B. MPLS 6PE/6VPE carries only IPv6 unicast prefixes over an IPv4/MPLS core and does not provide IPv6 multicast support by default, requiring entirely separate mechanisms for multicast.
- D. PIM Dense Mode uses a flood-and-prune behavior that wastes bandwidth and is unsuitable for service provider environments, and it does not provide a complete or scalable IPv6 multicast solution when combined with 6PE/6VPE.
Concept tested. IPv6 multicast design with MPLS 6PE/6VPE and MVPN
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