单项选择题
Which WLAN device is often used to make wireless connections between buildings or campuses?（）
A.access point B.client adapter C.bridge D.router
单项选择题 Which software-based security threat is typically spread from user to user via e-mail?（）
单项选择题 What does a router do?（）
单项选择题 The cisco telepresence portfolio provides industry-leading video-conferencing solutions , how does the Cisco acquisition of tandberg strengthen its position（）
