Among the following options, which one is not described in the network architecture.（）
A. Details of internal protocol implementation
B. Network level
C. Usage protocol of each layer
D. Functions to be completed for each layer
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In the OSI reference model, the main function of the Physical Layer is（）
A. Transparently transmitting bit streams
B. Access control and management of data link
C. Transferring data frames between physical entities
D. Transferring data frames between physical entities
Which is at the bottom of the OSI reference model（）
A. Physical Layer
B. Application Layer
C. Network Layer
D. Transport Layer
In the OSI reference model, the first bottom-up level to provide end-to-end services is（）
A. Transport layer
B. Network Layer
C. Data Link Layer
D. Application Layer
A system that uses various means of communication to organically connect geographically dispersed autonomous computers to realize mutual communication and share hardware, software and data resources i
A. Computer network
B. Terminal time sharing system
C. Distributed computer system
D. Multi machine system
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