300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

By Cisco · Question Mode

QuestionQ217

MPLS and Segment Routing

An engineer is diagnosing a connectivity problem across an MPLS network and verifying packet-forwarding behavior. Which table does the engineer examine to verify how an IP packet is forwarded as it enters the MPLS network at the ingress LSR?

  • A LFIB
  • B LIB
  • C RIB
  • D FIB
Explanation

An ingress LSR performs an IP route lookup in the FIB for an unlabeled IP packet. The resulting adjacency provides the information needed to impose the MPLS label and forward the packet. LFIB lookups apply to labeled MPLS packets, and RIB and LIB are control-plane tables.

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