Which of the following statements is wrong?

Question

Options

• AIn the MPLS VPNE connection model, the network consists of the operator's backbone network
• BThe network construction of MPLS VPN is completed by the service provider. In this network
• CThe backbone routers within the service provider's backbone network, that is, the routers that are
• DAll VPN construction, connection and management are performed on backbone routers.

• A
  7% (2)
• B
  4% (1)
• C
  19% (5)
• D
  70% (19)

Explanation

Option D is wrong because in MPLS VPN architecture, the core backbone routers (called P routers or Provider routers) are not responsible for VPN construction, connection, or management - that responsibility belongs to the PE (Provider Edge) routers, which maintain per-customer VRF (Virtual Routing and Forwarding) tables and handle VPN signaling. P routers simply forward MPLS-labeled packets without any awareness of VPN context. Options A and B are correct - the MPLS VPN network does consist of the operator's backbone, and the service provider builds and manages the infrastructure. Option C is also correct in describing backbone (P) routers as label-forwarding devices that don't participate in VPN logic.

Memory tip: Think of P routers as "post office sorters" - they just move labeled packages without knowing what's inside; it's the PE routers at the edge that actually open envelopes (inspect VPN context) and set up the delivery rules.

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