单项选择题
Which TCP port does LDP use for its protocol communications?（）
A.464 B.466 C.644 D.646
多项选择题 What are three valid LDP message types? （）(Choose three.)
单项选择题 Which attribute can be associated with an LDP-signaled LSP?（）
多项选择题 Which three can be specified within an RSVP session attribute object?（） (Choose three.)
