单项选择题
A.Cisco Express Forwarding
B.Cisco Routing Services
C.Cisco Firewall Security
D.Cisco Unity Express
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?（）
单项选择题 In which area of the campus LAN are the user computers attached to the network?（）