单项选择题
Which software-based security threat is typically spread from user to user via e-mail?（）
A.Data interception B.Virus C.Trojan horse D.Denial of service
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（）
单项选择题 Why is the Cisco Integrated Services Router product line A good choice for customers?（）
