单项选择题
Which interface tunnel parameter allows an LSP to use a specified explicit route?（）
A.path-option B.route-option C.explicit-path-option D.explicit-route-option
单项选择题 When configuring an explicit path, what does the next-address entry identify?（）
单项选择题 Which TCP port does LDP use for its protocol communications?（）
多项选择题 What are three valid LDP message types? （）(Choose three.)
