单项选择题 A service provider wants to prevent the repeat of a denial of service (DoS) attack that recently disabled Internet access for several thousand customers. Which Cisco solution best matches this business need?（）

单项选择题 A global manufacturer of automobile parts wants to implement specialized voice applications to increase productivity and reduce the cost of overseas toll calls. Which Cisco solution best matches this business need?（）

单项选择题 The Services-Ready Engine is an optional module of the Cisco ISR family. It includes onboard CPU and memory to run advanced applications. Which of these is an example of an advanced application that runs on the Services-Ready Engine?（）