单项选择题
A.Digital subscriber line (DSL)
B.Optical network
C.Wireless local-area network (WLAN)
D.Internet Protocol (IP) telephony
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?（）
单项选择题 Which type of deployment utilizes ISRs with Cisco IOS Security feature sets to provide an ideal, low-cost, yet capable and powerful platform?（）
单项选择题 In the 7-layer OSI model, which layer switching will take place?（）