单项选择题

Which of the following is true regarding Label Distribution Protocol （LDP）？（）

A.It is a label distribution protocol for MPLS
B.It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a network
C.Tag distribution Protocol （TDP） was the basis for LDP
D.All of the above are true

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What is the main difference between the information displayed on the dspload and the dsptrkutl screens？（）

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D.The dspload screen shows historical information； the dsptrkutl screen shows current information

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