How many usable IP addresses can you get from a conventional

【名词&注释】

路由器(router)、应用层(application layer)、物理层(physical layer)、会话层(session layer)

[单选题]How many usable IP addresses can you get from a conventional Class C address?

A. 128
B. 192
C. 254
D. 256
E. 510

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学习资料：

[单选题]在OSI七层模型中，介质工作在哪一层()

A. 传输层
B. 会话层^{(session layer)}
C. 物理层
D. 应用层

[单选题]路由器上激活端口的命令是（）

A. shutdown
B. no shutdown
C. up
D. noup

[多选题]The LAN needs are expanding at the Ezonexam corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the Ezonexam network.Which of the following are layer 1 devices that you can use? (Choose all that apply.)

A. A switch
B. A router
C. A network adapter card
D. A hub
E. A repeater

[多选题]Which three statements are true about the operation of a full-duplex Ethernet network, which is being used in the Ezonexam LAN? (Choose three)

A. Ethernet hub ports are preconfigured for full-duplex mode.
B. The host network card and the switch port must be capable of operating in full-duplex mode.
C. There are no collisions in full-duplex mode.
D. In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.
E. A dedicated switch port is required for each full-duplex node.

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