多项选择题
Which two types of nodes are included in an MPLS explicit route? （）(Choose two.)
A.peer B.strict C.loose D.system
单项选择题 Which type of hop in an ERO must be directly connected to the previous hop?（）
多项选择题 An RSVP session is maintained with the periodic exchange of which two message types?（） (Choose two.)
单项选择题 How is an RSVP resv message sent back to the ingress router?（）
