Refer to the exhibit. When running OSPF, What would cause router A not to form an adjacency with router B?（）

A.There is a mismatch in encapsulation types
B.The wrong type of cable is connected to the interface
C.The interface has been configured with the shutdown command
D.The interface is not receiving any keepalives
E.The interface needs to be configured as a DTE device
F.There is no encapsulation type configured

A.It tells the router or switch to try establish an SSH connection first and if that fail to use telnet.
B.It configures a cisco network device to use the SSH protocol on incoming communications via the virtual terminal ports.
C.It allows seven failed login attempts before the VTY lines are temporarily shutdown.
D.It configures the virtual terminal lines with the password 030752180500.
E.It configures SSH globally for all logins.

A.only passwords configured after the command has been entered will be encrypted
B.Only the enable password will be encrypted
C.Only the enable secret password will be encrypted
D.It will encrypt the secret password and remove the enable secret password from the configuration
E.It will encrypt all current and future passwords.