单项选择题
802.11g wireless signals operating at 24GHz has a maximum line of sight range of which of thefollowing?（）
A. 460 feet (140 meters)
B. 540 feet (165 meters)
C. 560 feet (171 meters)
D. 840 feet (256 meters)
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Link aggregation is also known as port:（）
A.distribution
B.mirroring
C.spanning
D.trunking -
单项选择题
When verifying a new wireless installation the administrator is unable to see a wireless signal withany wireless laptop. The MOST likely problem is:（）
A. The SSID is not set to broadcast
B. An incorrect channel is being used
C. Incorrect client security settings are configured
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单项选择题
Which of the following WAN protocols is a circuit switching technology?（）
A. ISDN
B. SONET
C. Frame Relay
D. ATM
