How to divide the computer network
This article mainly introduces how to divide the computer network, the article is very detailed, has a certain reference value, interested friends must read it!
According to the function and structure of the network, the computer network can be divided into resource subnet and communication subnet. The devices of the communication subnet work in the physical layer, data link layer, network layer and transport layer of the TCP/IP protocol, while the devices of the resource subnet work in the application layer of the TCP/IP protocol.
With the continuous improvement of the computer network structure, people logically separate the data processing function from the data communication function. The data processing part is called the resource subnet, and the communication function part is called the communication subnet.
Network hosts, terminals and their ancillary devices (including hardware, system software and application software, etc.), they constitute the basic resources of the network, mainly responsible for data processing tasks, called resource subnets.
Resource subnet refers to the client system (local dispatch automation network, MIS network and local area network of substation), including users' application resources, such as servers, fault collection computers, peripherals, system software and application software.
Communication subnet refers to the collection of devices and their software that realize the network communication function in the network. Communication devices, network communication protocols and communication control software belong to the communication subnet, which is the inner layer of the network and is responsible for the transmission of information.
The data processing part is called the resource subnet, and the communication part is called the communication subnet. There are two kinds of technologies used in communication subnets: one is circuit switching, the other is packet switching. The use of the latter in the automatic data processing network of civil aviation is more in line with the sudden characteristics of air traffic control data.
The resource subnet is responsible for network-wide data processing and providing resources and network services to network users, including network data processing resources and data storage resources.
Communication subnet mainly provides users with data transmission, transfer, processing, transformation and so on. The task of communication subnet is to send messages between end nodes, which is mainly composed of turning nodes and communication links. In ARPA network, the turning point is generally called interface processor (IMP).
Extended data:
As far as the local area network is concerned, the communication subnet consists of network cards, cables, hubs, repeaters, bridges, routers, switches and other equipment and related software. The resource subnet consists of networked servers, workstations, shared printers and other devices and related software.
In the wide area network, the communication subnet consists of some dedicated communication processors (that is, node switches) and their running software, concentrators and other devices and communication links connecting these nodes. The resource subnet consists of all hosts on the Internet and their external devices.
The devices of the communication subnet work in the physical layer, data link layer, network layer and transport layer of the TCP/IP protocol, while the devices of the resource subnet work in the application layer of the TCP/IP protocol.
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