What are three valid LDP message types? ()(Choose three.)
A、peer discovery
B、label distribution
C、path initialization
D、session management
E、connection establishment
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;