单项选择题
A. by securely deploying new applications with appropriate performance levels
B. by providing security that is based on a multilayer，system-level approach
C. by looking subjectively at network traffic for abnormal flows
D. by requiring a host-based hardware application
单项选择题 CiscoSMARTnetmaintainstheoperationalhealthofyournetworkthroughCiscoexpertiseand resourcesthatpromotegreateruptimeandextendthevalueofyourITinvestment.WhichserviceisprovidedbyCiscoSMARTnet？（）
单项选择题 WhichonlineCiscoresourceprovidesPPDIOOandLifecycleServicesmethodology？（）
单项选择题 TheLearning&EventssectionofCisco.comcontainsinformationaboutcertificationandadditionalCiscoeducationalresourcesthatenableyoutofurtheryourprofessionalopportunities.WhichprogramisdetailedinLearningSEvents？（）