单项选择题
A.Host B.Switch C.Printer D.Repeater
In the 7-layer OSI model, which layer switching will ta...
单项选择题In the 7-layer OSI model, which layer switching will take place?（）
A.Layer one B.Layer two C.Layer three D.Layer four
Which device is used in wireless networks to send trans...
单项选择题Which device is used in wireless networks to send transmissions to a target area?（）
A.Optical fiber B.Access point C.Directional antenna D.Omni-directional antenna
A service provider wants to prevent the repeat of a den...
单项选择题A service provider wants to prevent the repeat of a denial of service (DoS) attack that recently disabled Internet access for several thousand customers. Which Cisco solution best matches this business need?（）
A.Network security B.Wireless network C.Content networking D.Virtual Private Network (VPN)
