计算机类考试2022思科认证全真每日一练(09月17日)

1. [单选题]SMTP工作在OSI哪一层（）

A. 会话层
B. 表示层
C. 传输层
D. 应用层

2. [单选题]网关的功能（）

A. 过滤数据包
B. 不同网段通信
C. 校验数据帧
D. 把数据封装成“段”

3. [多选题]In which Spanning-Tree states does a switch port learn MAC addresses? (Select two)

A. Blocking
B. Listening
C. Forwarding
D. Learning
E. Relaying

4. [多选题]Why is full-duplex Ethernet superior to its single-duplex counterpart? (Select two answer choices.)

A. It uses inexpensive hubs
B. It operates without collisions
C. It operates on switches
D. It provides faster data transfer
E. It utilizes fewer wiring pairs

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