多项选择题
A. to verify the type of cable interconnecting two devices
B. to determine the status of network services on a remote device
C. to obtain VLAN information from directly connected switches
D. to verify Layer 2 connectivity between two devices when Layer 3 fails
E. to obtain the IP address of a connected device in order to telnet to the device
F. to determine the status of the routing protocols between directly connected routers
多项选择题 Which two locations can be configured as a source for the IOS image in the boot system command?（）
多项选择题 A network administrator is explaining VTP configuration to a new technician. What should the network administrator tell the new technician about VTP configuration?（）
多项选择题 Before installing a new, upgraded version of the IOS, what should be checked on the router, and which command should be used to gather this information?（）