【导读】
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1. [单选题]TELNET工作在OSI哪一层（）
A. 会话层(session layer)
B. 表示层
C. 传输层
D. 应用层
2. [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.
3. [单选题]关于帧中继的说法，正确的是（）
A. 速率最大为1Mbit/s
B. 不提供差错校验功能
C. 可以偷占带宽
D. 数据传输质量高于DDN
4. [单选题]OSI七层模型中，物理层的数据封装名称为（）
A. 比特
B. 帧
C. 包
D. 段
5. [单选题]The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?
A. 1 network with 254 hosts
B. 4 networks with 128 hosts
C. 2 networks with 24 hosts
D. 6 networks with 64 hosts
E. 8 networks with 36 hosts
