单项选择题

Which of the following wireless technologies can operate at only 5GHz?（）

A.802.11b/g
B.802.11g
C.802.11b
D.802.11a

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单项选择题

An administrator has added a new access point to the network to provide additional coverage. A heat-map survey shows coverage now extends beyond company property and is interfering with other wireless networks in the area.
How should the administrator modify the new installation to stop the interference?（）

A. Turn down the transmission strength of the access point.
B. Replace the antenna with a smaller one.
C. Change the wireless password to a more complex one.
D. Change the SSID of the access point

单项选择题

Which of the following layers of the OSI model is the presentation layer?（）

A.Layer 1
B.Layer 5
C.Layer 6
D.Layer 7

单项选择题

Which of the following WAN protocols is a packet switching technology?（）

A.Frame Relay
B.POTS
C.PSTN
D.ISDN