单项选择题

What will be disabled as a result of the no service password-recovery command？（）

A.password encryption service
B.changes to the config-register setting
C.the xmodem privilege EXEC mode command to recover the Cisco IOS image
D.ROMMON

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单项选择题

A standard access control list has been configured on a router and applied to interface Serial 0 in anoutbound direction. No ACL is applied to Interface Serial 1 on the same router. What will happen whentraffic being filtered by the access list does not match the configured ACL statements for Serial 0？（）

A.The traffic is dropped
B.The resulting action is determined by the destination IP address
C.The source IP address is checked，and，if a match is not found， traffic is routed out interface Serial 1
D.The resulting action is determined by the destination IP address and port number

单项选择题

Regarding constructing a good encryption algorithm， what does creating an avalanche effect indicate？（）

A.Altering the key length causes the ciphertext to be completely different
B.Changing only a few bits of a ciphertext message causes the plain text to be completely different
C.Altering the key length causes the plain text to be completely different
D.Changing only a few bits of a plain-text message causes the ciphertext to be completely different

单项选择题

Which item is correct regarding Cisco IOS IPS on Cisco IOS Release 12.4（11）T and later ？（）

A.requires the Basic or Advanced Signature Definition File
B.uses the built-in signatures that come with the Cisco IOS image as backup
C.supports SDEE，SYSLOG，and SNMP for sending Cisco IPS alerts
D.uses Cisco IPS 5.x signature format