A.footprint analysis attack
B.privilege escalation attack
C.buffer Unicode attack
D.social engineering attack
E.front door attacks
F.Trojan horse attack

A.The Cisco IOS image file will not be visible in the output from the show flash command.
B.The show version command will not show the Cisco IOS image file location.
C.When the router boots up， the Cisco IOS image will be loaded from a secured FTP location.
D.The running Cisco IOS image will be encrypted and then automatically backed up to a TFTP server.