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

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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
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)
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