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
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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
单选题 The ( ) layer of the OSI model is responsible for node-to-node delivery of a frame between two adjacent stations.
A. transport
B. network
C. data-link
D. session