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

A.Telnet to WANRouter and execute the command show interfaces S0/0
B.Telnet to WANRouter and execute the command show processes S0/0
C.Telnet to WANRouter and execute the command show running-configuration
D.Telnet to WANRouter and execute the command show controller S0/0
E.Physically examine the cable between WANRouter S0/0 and the DCE
F.Establish a console session on WANRouter and execute the command show interfaces S0/0

A.Switch A - Fa0/0
B.Switch A - Fa0/1
C.Switch B - Fa0/0
D.Switch B - Fa0/1
E.Switch C - Fa0/0
F.Switch C - Fa0/1

A.to make VTP easier to implement
B.to isolate broadcast traffic
C.to increase the size of the collision domain
D.to allow more devices to connect to the network
E.to logically group hosts according to function
F.to increase network security

A.proxy
B.dual-stack
C.tunneling
D.dot1q