Whichofthefollowingislessvulnerabletothreatsandattacksbecauseitisnotassociatedwithonespecificoperatingsystem？（）
A. CiscoVoiceandVideooverVPN
B. CiscoSecureAccessControlServer
CiscoNACAppliance
D. CiscoThreatsResponse
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WhichtwowaysdoesanintegratedsecuritysolutionreduceTCO？（）
A. byenablingbusinesstoleverageinvestmentsinthenetwork
B. byspendinglesstimeaddressingattacks
C. byenforcingpolicycompliance
D. throughadmissioncontrol
传统的电话网是通过电路交换网传送电话信号。IP电话是通过分组交换网传送电话信号。（)
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