A. spanning-tree mode rapid-pvst
B. spanning-tree uplinkfast
C. spanning-tree backbonefast
D. spanning-tree mode mst

A.Router(config)#password-encryption
B.Router(config)#service password-encryption
C.Router#service password-encryption
D.Router# password-encryption

A. show interfaces interface
B. show interfaces trunk
C. show interfaces switchport
D. show ip interface brief
E. show interfaces vlan

A.Administratively shut down the interfaces.
B.Physically secure the interfaces.
C.Configure a virtual terminal password and login process.
D.Enter an access list and apply it to the terminal interfaces using the access-class command.
E.Create an access list and apply it to the terminal interfaces using the access-group command

A.CHAP uses a two-way handshake
B.CHAP authentication periodically occurs after link establishment
C.CHAP has no protection from playback attacks
D.CHAP authentication is performed only upon link establishment
E.CHAP uses a three-way handshake
F.CHAP authentication passwords are sent in plaintext