Your customer requires a Layer 2 VPN service (draft-kompella-mpls-l2vpn). You are asked to describe the operational requirements on the PE router supporting this service. Which two statements are…

Question

Options

• AThe ingress PE router associates multiple MPLS labels with the corresponding traffic flows.
• BThe ingress PE router for a traffic flow maintains the data-link connection identifier.
• CThe ingress PE router for a traffic flow removes the data-link connection identifier.
• DThe ingress PE router associates a single MPLS label with the corresponding traffic flows.

• A
  73% (33)
• B
  9% (4)
• D
  18% (8)

Explanation

A: When a packet arrives at a PE from a CE in a Layer 2 VPN, the Layer 2 address of the packet identifies to which remote attachment circuit (and thus remote CE) the packet is destined. The procedure installs a route that maps the Layer 2 address to a tunnel (which identifies the PE to which the destination CE is attached) and a VPN label (which identifies the destination AC). If the egress PE is the same as the ingress PE, no tunnel or VPN label is needed. C: In case of IP-only Layer 2 interworking, the Layer 2 header is completely stripped off till the IP https://tools.ietf.org/html/draft-kompella-l2vpn-l2vpn-10

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