Which TCP port does LDP use for its reliable transport connections?
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Correct answer: 646.
Why this is the answer
LDP (Label Distribution Protocol) uses TCP port 646 for establishing and maintaining its reliable transport connections between LDP peers. This port is specifically registered for LDP and is used for exchanging label mappings, Hellos, and other LDP messages. Options 648, 752, and 712 are incorrect as they are not the designated TCP port for LDP operations. Port 648 is used by RRP (Reliable RDP), 752 is for the Control Data Plane (CDP), and 712 is unassigned.
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