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

单项选择题AstandardaccesscontrollisthasbeenconfiguredonarouterandappliedtointerfaceSerial0inanoutbounddirection.NoACLisappliedtoInterfaceSerial1onthesamerouter.WhatwillhappenwhentrafficbeingfilteredbytheaccesslistdoesnotmatchtheconfiguredACLstatementsforSerial0？（）

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Regardingconstructingagoodencryptionalgorithm，whatdoescreatinganavalancheeffectindicate？（）

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WhichitemiscorrectregardingCiscoIOSIPSonCiscoIOSRelease12.4（11）Tandlater？（）

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

单项选择题AfterenablingportsecurityonaCiscoCatalystswitch，whatisthedefaultactionwhentheconfiguredmaximumofallowedMACaddressesvalueisexceeded？（）

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

单项选择题Streamciphersrunonwhichofthefollowing？（）

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