300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

By Cisco · Question Mode

QuestionQ340

VPN Technologies

What term describes the condition in which packets lose their MPLS labels, including the VPN information contained in the inner MPLS label—for example, when a packet passes through an untagged interface, causing VPN information to be lost and VPN sites to lose connectivity?

  • A Pseudowire
  • B Black Hole
  • C Traffic Engineering
  • D Active Network Abstraction
Explanation

An MPLS VPN black hole occurs when the MPLS label stack is lost on an unlabeled path or interface. Without the inner VPN label, the receiving device cannot identify the appropriate VPN forwarding context, so traffic is dropped and VPN connectivity fails.

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