單項選擇題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


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1.單項選擇題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

2.單項選擇題After enabling port security on a Cisco Catalyst switch, what is the default action when the configuredmaximum of allowed MAC addresses value is exceeded?()

A.The port’s violation mode is set to restrict
B.The port is shut down
C.The MAC address table is cleared and the new MAC address is entered into the table
D.The port remains enabled, but bandwidth is throttled until old MAC addresses are aged out

3.單項選擇題Stream ciphers run on which of the following?()

A.Fixed-length groups of digits called blocks
B.Individual blocks,one at a time,with the transformations varying during the encryption
C.Individual digits,one at a time,with the transformations varying during the encryption
D.Fixed-length groups of bits called blocks

4.單項選擇題What is the objective of the aaa authentication login console-in local command?()

A.It specifies the login authentication method list named console-in using the local user database on the router
B.It specifies the login authorization method list named console-in using the local RADIUS username-password data base
C.It specifies the login authentication list named console-in using the local username- password data base on the router
D.It specifies the login authorization method list named console-in using the local username- password data base on the router

5.多項選擇題Which statement best describes the Turbo ACL feature? ()

A.The Turbo ACL feature processes ACLs into lookup tables for greater efficiency
B.The Turbo ACL feature leads to increased latency, because the time it takes to match the packet isvariable
C.The Turbo ACL feature leads to reduced latency, because the time it takes to match the packet is fixedand consistent
D.Turbo ACLs increase the CPU load by matching the packet to a predetermined list

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