Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 484

What action is performed for untagged outgoing labels in an MPLS router?

Answer options

• A. Convert the incoming MPLS packet to an untagged packet and then do a RIB lookup.
• B. Convert the incoming MPLS packet to an untagged packet and then do a FIB lookup.
• C. Convert the incoming MPLS packet to an IP packet and forward it to the next router.
• D. Convert the untagged packet to a labeled packet and forward it to the next router.

Correct answer: C

Explanation

The correct answer is C because an MPLS router processes untagged packets by converting them into IP packets for routing. Options A and B are incorrect as they mention RIB and FIB lookups without the necessary conversion to IP. Option D is incorrect because it describes transforming an untagged packet into a labeled packet, which is not the action taken for untagged outgoing labels.