单项选择题
单项选择题 Becauseofthesystems－levelapproach，Ciscosecuritycandefendagainstwidespreadattacks fromhackersandviruses.WhatdescribestheCisconetworksecuritystrategy？（）
单项选择题 Whatwillcausewirelessvoicedevicestoperformpoorly？（）
单项选择题 InWhichofthesephasesareacustomer’sbusinessrequirementsidentifiedanddocumented？（）