单项选择题

Which of the following network devices operates on Layer 1 of the OSI model？（）

A.Hub
B.Switch
C.Router
D.Bridge

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单项选择题

A network technician is installing a series of three access points to cover the entire wing of a building. Each access point has a wired connection and 802.11g is being used for the wireless transmission. Which of the following channels should be used for the access points？（）

A.Channels 1-6-11
B.Channels 1-3-5
C.Channels 7-11-1
D.Channels 2-4-6

单项选择题

A technician notices that when trying to ping a workstation by network name the workstation does not reply back over the network. The workstation is part of the domain and is able to get to the Internet. Which of the following is the cause of the problem？（）

A.Faulty cable on the workstation
B.Wrong host name on the workstation
C.Wrong WINS on the workstation
D.Incorrect IP address assigned to the workstation

单项选择题

A second network card in a server that activates if the primary card fails is an example of which of the following network performance optimization？（）

A.Load balancing
B.QoS
C.High availability
D.Fault tolerance

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