4A0-103 Exam - Question 27

In the context of a received unlabeled packet, a POP label stack operation is not applicable because there is no label to pop. The other options describe actions that can occur once the destination IP address is matched in the FIB, such as determining the outgoing interface and next-hop address (B), forwarding the packet as either labeled or unlabeled based on the forwarding decision (C), and potentially pushing a new label on the packet if it is about to enter an MPLS domain (D). Therefore, the statement suggesting that a POP label stack operation may be performed is false.