Which two statements about TDP and LDP are true? (Choose two)

A.
TDP and LDP populate the same LFIB.

B.
TDP operates over UPD while LDP operates over TCP.

C.
TDP and LDP both operate over TCP, but use different port numbers.

D.
While TDP and LDP are functionally equivalent, they use a different label format.

Explanation:

According to the "Implementing Cisco MPLS" Student Guide (Text Part Number: 97-1153-01) Volume 1, version 1.0, page 2-51.
TDP vs. LDP:
– MPLS and Tag switching are equal on the data plane ( for me it means that they populate the same FIB and LFIB)
– The only difference is on the control plane, where tag switching uses Cisco proprietary TDP and MPLS uses standard LDP
– TDP and LDP are functionally equivalent but not compatible
– TDP use UDP and TCP port number 711
– LDP uses UDP and TCP port number 646
Not D: LDP and TDP use the same label format.