A.The default value of BGP route MED is 0

B.By default, BGP routing rules can compare the MED of routes from different autonomous systems

C.By default, if there is no MED value in the route attribute, it will be treated as 0. If the bestroute med-none-as-maximum command is configured, the MED will be processed as the maximum value of 4294967295

D.In BGP routing rules, the priority of MED is lower than AS Path, Praferred-Value, Local-Preference and Origin

A.In FTP Active mode, the server uses the command "PORT" to tell the client which port it expects to send data.

B.FTP always uses a TCP session to transmit control information and data information.

C.FTP always uses TCP port 20 to establish a data session, using ICP port 21 to establish control Session

D.FTP always uses TCP port 21 to establish a data session and TCP port 20 to establish a control session.

E.In the FTP Passive mode, the client completes the initialization of the TCP session for control and data.

A.BGP Router ID

B.Routing attributes

C.Local Autonomous System (AS) number

D.Hold time

A.Both OSPF and IS-IS support area division

B.Both DR and BDR need to be elected in the broadcast network

C.Both OSPF and IS-IS use Hello messages to establish and maintain neighbor relationships

D.Both OSPF and IS-IS are link state protocols

A.Application layer

B.Session layer

C.Expression layer

D.Transport layer

E.Data link layer