A.The message sent by the end

B.Messages sent and received by the port

C.Packets discarded by the port

D.Packets accepted by the interface

A.The MPLS system has multiple label distribution protocols, such as LDP, which is a label distribution protocol.

B.The label is a fixed-length identifier with only local significance, which is used to uniquely identify the FEC to which a packet belongs

C.The label is carried by the header of the MPLS packet and has global significance, that is, the label value of all routers cannot be repeated

D.MPLS supports single-layer labels as well as multi-layer labels

A.The hello packet sending interval of Level-1 of this interface is 5s

B.The CSNP packet sending interval of the interface Leve-2 is 5s

C.The hello packet sending interval of Leve-1 and Leval-2 of the interface is 3s

D.The hello packet sending interval of Leve-2 on this interface is 5s

A.must be the same

B.may be the same

C.must be different

A.Two LSRs send Hello messages to each other. The Hello message carries the transport address, and the party with the larger transport address acts as the active party and initiates the establishment of a TCP connection.

B.The active party will send an Advertisement Message to negotiate relevant parameters for establishing an LDP session, including the LDP protocol version, label distribution method, Keepalive retention timer value, maximum PDU length, and label space.

C.If the Hello Messager does not carry the Transport Address

D.If the passive party can accept the relevant parameters, it will send an InitializationMessage and a Keepalive message to the active party.