A.outing domain authentication is primarily used to allow level-1 and Level-2 SNP and LSP messages to carry authentication information during delivery.

B.All router domain authentication methods of the same routing domain are MD5, the password is hello, and lS-IS SNP and LSP will spread normally.

C.ISIS authentication cannot be applied in IPv6 environments.

D.This command is mainly used to make is the ISIS Hello message carry authentication information during the transmission process.

A.The 8021w bridge forwards only BPDU packets received from the root bridge

B.The 8021D bridge does not forward BPDU messages

C.8021D bridge only forwards BPDU packets received from the root bridge

D.8021w Bridge does not forward BPDU packet

A.The mandatory attribute in the route update packet is missing.

B.The wrong BGP packet was received.

C.After the BGP connection is established, the keepalive message is not received within the negotiated holdtime time.

D.Open message negotiation failed.

A.lSIS circuit type

B.ISIS timer hello

C.ISIS circuit level

D.ISIS cost

A.If the bottom of the label identifies S=0, it indicates that the label is the bottom label and is directly forwarded to the IP.

B.By default, devices support php features, and the ERAS node that supports PHP assigns a tag value of 3 to the penultimate hop node

C.When the tag value is 0, the tag must be ejected and the message must be forwarded based on IPv4

D.The MPLS tag is 4 bytes long and encapsulated between the link layer and the network layer.