单项选择题
A. voice, intranet, and security
B. wireless, intranet, and wide-area networking
C. wireless, security, and voice
D. security, voice, and wide-area networking
单项选择题 The Cisco UC520 provides integrated WLAN connectivity to mobile clients for which technology?（）
单项选择题 Which Cisco support service product targets customers with up to 48 users on a network where voice communication is mission-critical to business operation?（）
多项选择题 Why are consumer-grade access points and routers not the best choice for SMBs?（）