Which of these statements best describes VPLS?

Question

Options

• ANeither broadcast nor multicast traffic is ever flooded in VPLS.
• BMulticast traffic is flooded but broadcast traffic is not flooded in VPLS.
• CVPLS emulates an Ethernet switch, with each EMS being analogous to a VLAN.
• DBecause U-PE devices act as IEEE 802.1 devices, the VPLS core must use STP.
• EWhen the provider experiences an outage, IP re-routing restores PW connectivity and MAC

• A
  3% (1)
• B
  3% (1)
• C
  88% (28)
• D
  6% (2)

Explanation

VPLS (Virtual Private LAN Service) is an MPLS-based Layer 2 VPN technology that emulates a multipoint Ethernet switch across a provider core, giving geographically dispersed customer sites the appearance of being on the same LAN segment. Each VPLS instance (Ethernet Multipoint Service / EMS) acts like a separate VLAN - it has its own MAC address table and forwards frames based on learned MAC addresses. Broadcast and unknown-unicast traffic is flooded within the VPLS instance (ruling out options A and B); STP is not required in the VPLS core because PE devices handle MAC learning (ruling out D); and IP re-routing does not restore pseudowire connectivity on its own (ruling out E).

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