What are three valid LDP message types?()
A、Path
B、Session
C、discovery
D、establishment
E、Advertisement
A、Path
B、Session
C、discovery
D、establishment
E、Advertisement
A、peer discovery B、label distribution C、path initialization D、session management E、connection establishment
A、A.p0 = p1; B、B.p1 = p2; C、C.p2 = p4; D、D.p2 = (ClassC)p1; E、E.p1 = (ClassB)p3; F、F.p2 = (ClassC)p4;