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1. [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.
2. [单选题]关于PPP和HDLC的说法中,错误的是()
A. PPP是通用协议,HDLC是CISCO私有协议
B. PPP有验证功能,HDLC无验证功能
C. PPP效率低,HDLC效率高(high efficiency)
D. 在配置ISDN时,广域网协议不能封装成PPP,但可以封装成HDLC
3. [多选题]交换机的三大功能为()
A. 地址学习
B. 转发过滤
C. 消除回路
D. 发送数据包
4. [单选题]在路由器上,命令show access-list的功能是()
A. 显示访问控制列表内容
B. 显示路由表内容
C. 显示端口配置信息
D. 显示活动配置文件
5. [单选题]工作在OSI第三层(layer 3)的设备是:()
A. 网卡
B. 路由器
C. 交换机
D. 集线器