Among the following options, that not described in the network architecture is（）
A. the implementation details in protocol
B. networks layers
C. protocols used in each layer
D. the function of each layer
查看答案
ARPANET is the predecessor of Internet，and it is a（）
A. circuit switching network
B. message switching network
C. packet switching network
D. hybrid switching network
In OSI/RM architecture,the lowest is（）
A. application layer
B. network layer
C. transmission layer
D. physical layer
In OSI/RM architecture, the first layer that provide end-to-end service from buttom to top is（）
A. network layer
B. transmission layer
C. data link layer
D. application layer
In OSI/RM architecture,the function of physical layer is（）
A. data link access control and management
B. Transparently transmitting bitstreams
C. transmitting data frames between physical entities
D. transmitting and receiving data message
微信支付 
支付宝支付