Exam 300-410 topic 1 question 490 discussion

It's B but the point here is that the question is asking how the router ID is used. The Transport address is the same as the LDP router ID the transport address is used to establish the TCP session for forming the LDP adj between the routers.

B is corerct

A. not true, force causes downtime B. true, the highest loopback is chosen if not manually configured, then if there are no loopbacks it chooses the highest IP address given to any other interface. C. doesn't really make sense to necessitate them matching anyways, it's not true. D. no, it selects highest loopback first, then if unsuccessful it tries physical interfaces.

In an MPLS (Multiprotocol Label Switching) network, the LDP (Label Distribution Protocol) router ID is used to uniquely identify a router within the MPLS domain. The correct statement about the LDP router ID is: B. The loopback with the highest IP address is selected as the router ID: By default, the LDP router ID is determined based on the loopback interface with the highest IP address configured on the router. This provides a stable and predictable router ID that is not tied to the operational state of physical interfaces. The other options (A, C, and D) do not accurately describe the default behavior of how the LDP router ID is determined in an MPLS network.