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352-001 · Question #78
352-001 Question #78: Real Exam Question with Answer & Explanation
The correct answer is A: Direct-attached VPLS requires a full mesh of pseudowires.. VPLS has three primary drawbacks: full-mesh pseudowire requirements, MAC address scalability issues on the SP network, and high BUM (broadcast/unknown/multicast) replication overhead.
Question
What are three drawbacks of VPLS? (Choose three.)
Options
- ADirect-attached VPLS requires a full mesh of pseudowires.
- BVPLS cannot support IP bridging (as defined in the VPLS standard).
- CMAC scalability may be problematic, since customer MACs will be visible on the service provider network.
- DVPLS requires a large amount of multicast and broadcast replication.
Explanation
VPLS has three primary drawbacks: full-mesh pseudowire requirements, MAC address scalability issues on the SP network, and high BUM (broadcast/unknown/multicast) replication overhead.
Common mistakes.
- B. VPLS is specifically designed to support Layer 2 IP bridging by emulating an Ethernet LAN segment across an MPLS network, so the inability to support IP bridging is not a valid drawback.
Concept tested. VPLS scalability and architectural drawbacks
Reference. https://www.rfc-editor.org/rfc/rfc4664
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