Brief introduction of computer network 10--computer network architecture

Contents of this page

1. The origin of computer network architecture

2. Layered Network Architecture

3. Conclusion

1. Computer network Architecture

The computer network is a very complex system, composed of many devices and protocols, it is not easy to describe it. Therefore, a better architecture is needed to describe and implement it. Layered network architecture is a good choice.

2. Layered Network Architecture

Layered structure =network architecyure

Since almost all networks are more or less layered, we refer to the architecture of the computer network as a hierarchical structure.

So why would you choose a hierarchy?

That is because the structure of the hierarchical structure is clear , it is advantageous to identify the components and their relationships of the complex system, such as computer network, can effectively establish layered

Reference Models (Reference Model). At the same time, the modular hierarchy facilitates the updating and maintenance of the system (any change in service implementation is transparent to the other layers of the system, unaffected).

The hierarchical structure also facilitates the standardization of communication protocols between different layers of equipment.

Having said so much, let's look at the layered structure:

Entity =entity: Represents any hardware or software process that can send or receive information.

Protocol: A collection of rules that control the communication of two peer entities , that is, the protocol is " horizontal ".

At the same time, any layer of entities need to use lower-level services, follow this layer of protocol, to achieve this level of functionality, to provide services to the upper layer, so the service is " vertical "

The implementation of the lower level protocol is transparent to the service users on the upper level, and the implementation of the lower level protocol has no effect on the upper layer, because the interface is invariant.

Interact with the adjacent layer entities of the system through interfaces, through the service access point SAP (services access points), Exchange primitives, and specify the specific services requested.

3. Conclusion

In general, computer network Architecture is a collection of computer network layers and their protocols, and the system structure is a definition of the function level and relationship of computer network.

Brief introduction of computer network 10--computer network architecture