300-320 · Question #331
Which protocol does VPLS use to tunnel layer 2 ethernet frames?
The correct answer is A. MPLS. VPLS (Virtual Private LAN Service) is a Layer 2 VPN technology that emulates an Ethernet LAN across a service provider's WAN. It uses MPLS (Multiprotocol Label Switching) as its transport mechanism to tunnel Layer 2 Ethernet frames between customer sites. In a VPLS deployment…
Question
Which protocol does VPLS use to tunnel layer 2 ethernet frames?
Options
- AMPLS
- BL2TPv3
- CL2TPv1
- DVXLAN
How the community answered
(28 responses)- A93% (26)
- B4% (1)
- D4% (1)
Explanation
VPLS (Virtual Private LAN Service) is a Layer 2 VPN technology that emulates an Ethernet LAN across a service provider's WAN. It uses MPLS (Multiprotocol Label Switching) as its transport mechanism to tunnel Layer 2 Ethernet frames between customer sites. In a VPLS deployment, provider edge (PE) routers use LDP or RSVP-TE to establish MPLS pseudowires (LSPs) that carry Ethernet frames between sites, making geographically dispersed sites appear as if they are on the same local LAN segment. L2TPv3 is an alternative tunneling protocol for Layer 2 VPNs but is not the primary protocol used by VPLS. VXLAN is a data center overlay technology, not used in traditional VPLS.
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