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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]为了禁止网络210.93.105.0ftp到网络223.8.151.0，允许其他信息传输，则能实现该功能的选项是：()
A. access-list 1 deny 210.93.105.0.0.0.0.0.0
B. access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftp
C. access-list 100 permit ip any any
D. access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.00.0.0.255 eq ftp access list 100 permit ip any any
3. [单选题]介质工作在OSI的哪一层（）
A. 物理层
B. 数据链路层
C. 网络层
D. 传输层
