Which VPN technology is an example of a full-mesh VPN?

Question

Options

• AVTI
• BGRE VPN
• CFrame Relay L2 VPN
• DMPLS L3VPN

• A
  15% (5)
• B
  6% (2)
• C
  3% (1)
• D
  76% (26)

Explanation

MPLS L3VPN is considered a full-mesh VPN because it provides any-to-any connectivity between all customer sites through the provider's MPLS backbone - each site can reach every other site directly without routing traffic through a central hub. The provider's PE routers use MP-BGP to distribute VPN routes, enabling seamless full-mesh reachability across all VPN members by default.

Why the distractors are wrong:

• VTI (A): Virtual Tunnel Interfaces create individual point-to-point IPsec tunnels - inherently peer-to-peer, not full-mesh.
• GRE VPN (B): GRE also creates point-to-point tunnels; achieving full mesh would require manually building N*(N-1)/2 tunnels, making it impractical and not an inherent full-mesh design.
• Frame Relay L2 VPN (C): Frame Relay is classically hub-and-spoke; all spoke traffic must traverse the hub, the opposite of full-mesh.

Memory tip: Think "MPLS = Mesh" - MPLS L3VPN is synonymous with any-to-any routing in enterprise WAN design, which is precisely what "full mesh" means. If the WAN exam question mentions any-to-any or full mesh, MPLS L3VPN is almost always the answer.

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