单项选择题
Which statement is true about a Smurf attack？（）
A.It sends ping requests in segments of an invalid size
B.It intercepts the third step in a TCP three-way handshake to hijack a session
C.It sends ping requests to a subnet， requesting that devices on that subnet send ping replies to a targetsystem
D.It uses Trojan horse applications to create a distributed collection of "zombie" computers， which can beused to launch a coordinated DDoS attack
相关考题
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单项选择题
Whatwillbedisabledasaresultofthenoservicepassword-recoverycommand？（）
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 -
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
