Which statement is true about a certificate authority？（）

多项选择题Whatarefourmethodsusedbyhackers？（）

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

单项选择题WhichresultisofsecuringtheCiscoIOSimagebyuseoftheCiscoIOSimageresiliencefeature？（）

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.

单项选择题YouareanetworktechnicianatCertpaper.com.Whichdescriptioniscorrectwhenyouhavegenerated RSAkeysonyourCiscoroutertoprepareforsecuredevicemanagement？（）

A.You must then specify the general-purpose key size used for authentication with the crypto key generaters a general-keys modulus command.
B.You must then zeroize the keys to reset secure shell before configuring other parameters.
C.All vty ports are automatically enabled for SSH to provide secure management.
D.The SSH protocol is automatically enabled.

单项选择题Whatshouldbeenabledbeforeanyuserviewscanbecreatedduringrole-basedCLIconfiguration？（）

A.aaa new-model command
B.secret password for the root user
C.usernames and passwords
D.multiple privilege levels

多项选择题Whichthreeoptionsarenetworkevaluationtechniques？（）

A.Performing end-user training on the use of antispyware software
B.Performing virus scans
C.Scanning a network for active IP addresses and open ports on those IP addresses
D.Using password-cracking utilities