单项选择题
A. routing and switching
B. web collaboration
C. on the destination network, between the server and a router
D. eCommerce
E. voice
F. security
多项选择题 Select the three foundational hardware components that comprise the Smart Business Communication System.（）
单项选择题 In which areas do SMBs tend to require better products than found in retail stores?（）
单项选择题 The Cisco UC520 provides integrated WLAN connectivity to mobile clients for which technology?（）