Which of the following is not included in the basic architecture of MPLS L2VPN?

Question

Options

• AAC
• BVC
• CTunnel
• DS-VLAN

• A
  2% (1)
• B
  13% (6)
• C
  6% (3)
• D
  79% (37)

Explanation

S-VLAN is not part of MPLS L2VPN's basic architecture because it belongs to IEEE 802.1ad (QinQ/Provider Bridging), a carrier Ethernet technology used to tag traffic at the service provider level - a completely separate domain from MPLS-based VPNs.

The three distractors are all genuine MPLS L2VPN components: AC (Attachment Circuit) is the physical or logical link connecting the customer edge (CE) to the provider edge (PE) router; VC (Virtual Circuit/Pseudowire) is the logical end-to-end connection that emulates a Layer 2 link between two PE routers across the provider network; and Tunnel is the MPLS LSP (Label Switched Path) that transports those pseudowires across the core network.

Memory tip: Think of MPLS L2VPN as a three-layer stack - AC gets traffic in, the VC (pseudowire) carries it logically, and the Tunnel (LSP) transports it physically. S-VLAN has no place in this stack because it's an Ethernet-layer tag, not an MPLS construct. If you see "VLAN" in an MPLS L2VPN question, it's almost always the distractor.

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