Implementing Cisco Service Provider Advanced Routing Solutions (SPRI) — Question 8

An engineer is troubleshooting a connectivity issue across the MPLS network and is verifying the forwarding behavior of packets. Which table does the engineer look at to verify the forwarding behavior of an IP packet as it enters the MPLS network at the ingress LSR?

Answer options

• A. LFIB
• B. LIB
• C. RIB
• D. FIB

Correct answer: D

Explanation

The correct answer is D, FIB (Forwarding Information Base), as it contains the information used to forward packets. The LFIB (Label Forwarding Information Base) is specifically for label-switching, while the LIB (Label Information Base) and RIB (Routing Information Base) serve different purposes in the routing and label distribution processes.