多项选择题
A. by enabling businesses to leverage investments in the network
B. by spending less time addressing attacks
C. by enforcing policy compliance
D. through admission control
单项选择题 TherearefourmainCiscocertificationlevelsthatyoucanattainasacertifiedCiscoprofessional.Whatisthehighestlevelofcertificationthatisoffered？（）
单项选择题 WhichstatementbestdescribesthedifferencesbetweenCiscoSMARTnetandCiscoSMARTnet Onsite？（）
多项选择题 TheCiscoUnifiedWirelessNetworkminimizestheTCOandmaximizeswirelessnetworkuptimebyoptimizingwhichtwodeployment，management，andsecurityfeatures？（）