题目内容

单选题 The ( )layer of the OSI model organizes bits into logical data units called frames.

A. physical
B. data-link
C. network
D. transport

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单选题 The ( ) layer of the OSI model enables a person to access the network.

A. data-link
B. transport
C. application
D. physical

单选题 The ( ) layer of the OSI model compresses and decompresses data.

A. physical
B. data-link
C. session
D. presentation

单选题 The ( ) layer of the OSI model encrypts data.

A. physical
B. data-link
C. session
D. presentation

单选题 The ( ) layer of the OSI model transmits a bit stream over a physical medium.

A. physical
B. data-link
C. network
D. transport