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
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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
单选题 The ( ) layer of the OSI model is responsible for source-to-destination delivery of the entire message.
A. transport
B. network
C. data-link
D. session
单选题 The ( ) layer of the OSI model is responsible for source-to-destination delivery of an individual packet.
A. transport
B. network
C. data-link
D. session
单选题 The ( ) layer of the OSI model controls the dialog between users.
A. transport
B. session
C. presentation
D. application