Sihai network

Computer networks are logically divided into

In terms of logical function, computer network can be divided into resource subnet and communication subnet.

Resource subnet and communication subnet. The computer network is first a communication network. Each computer carries out digital communication through communication media and communication equipment. On this basis, each computer can share hardware resources, software resources and information resources on other computers through network software.

Resource subnet: from the function of each component of computer network, each component mainly performs two functions, namely network communication and resource sharing. The set of equipment and software that realize network communication function in computer network is called network communication subnet, and the set of equipment and software that realize resource sharing function in network is called resource subnet.

Communication subnet: refers to the collection of equipment and software that realize network communication function in the network. Communication equipment, network communication protocol, communication control software, etc. belong to communication subnet, which is the inner layer of the network and is responsible for information transmission. It mainly provides users with data transmission, transfer, processing, transformation, etc. (JiSuanJiWangLaoCongLuoJiGongNengShangFenWei)