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This article mainly introduces the architecture of the computer network system. It is very detailed and has a certain reference value. Friends who are interested must finish reading it.

The architecture adopted by the computer network system is: the seven-layer protocol architecture of OSI, the four-layer protocol of TCP/IP and the architecture of five-layer protocol, which is the hierarchical division of network protocols and the collection of protocols of each layer, and the protocols in the same layer are determined according to the functions of this layer.

The architecture adopted by the computer network system is:

There are three architectures

1. OSI's seven-layer protocol architecture.

OSI is a standard developed by the International Organization for Standardization (ISO). It has a clear concept and perfect theory, but it is complex and impractical.

The architecture of OSI

7 Application layer

6 presentation layer

5 session layer

4 transport layer

3 Network layer

2 data link layer

1 physical layer

2. TCP/IP 's four-layer protocol

TCP/IP architecture has been widely used.

TCP/IP architecture

4 Application layer (various application layer protocols such as FTP,DNS, etc.)

3 Transport layer (TCP or UDP)

2 Internet layer (also known as network interconnection layer)

1 data link layer (also known as network interface layer)

3. Architecture with five-layer protocol

Learn the architecture of network principles, combining the advantages of OSI and TCP/IP.

5 Application layer

4 transport layer

3 Network layer

2 data link layer

1 physical layer

(5) Application layer

The application layer provides services for the user's application process directly.

Application layer protocols: FTP,DNS,HTTP and other protocols.

(4) Transport layer

The transport layer is responsible for providing services for communication between processes in two hosts.

Protocols used by the transport layer:

1 > Transmission Control Protocol TCP

Connection-oriented, the data transmission unit is the message segment, providing reliable delivery.

2 > user Datagram Protocol UDP

If there is no connection, the data transmission unit is Datagram, and reliable delivery is not guaranteed.

(3) Network layer (using IP protocol)

The network layer is responsible for providing communication services for different hosts on the packet switching network.

Tasks at the network layer:

When sending data, the network layer encapsulates the message segments or user datagrams generated by the transport layer into packets (also known as IP datagrams) for transmission. Another task of the network layer is

Select the appropriate route so that the packets passed down by the source host transport layer can find the destination host through the router in the network.

(2) data link layer

When data is transferred between two adjacent nodes (between a host and a router or between two routers), the data link layer assembles the IP Datagram submitted by the network layer into a frame

The data in the frame is transmitted on the link of two adjacent nodes.

(1) physical layer

The physical layer is used to transmit bitstreams.

Transmission uses some physical media: twisted pair, optical fiber, etc.

Benefits of layering

(1) each layer is independent. A layer does not need to know how its next layer is implemented, just call the interface between layers.

(2) good flexibility. Change any of these layers, as long as the interface remains the same, the other layers will not be affected.

(3) easy to implement and maintain.

(4) it can promote standardization work. The functions of each layer are accurately described.

What is the computer network architecture

Computer network architecture is the hierarchical division of network protocols and the collection of protocols in each layer. The protocols in the same layer are determined according to the functions to be implemented in this layer.

The protocol function between the peer layers is completed by the corresponding underlying services.

The reasons for the emergence of computer Network Architecture

Computer network is a very complex system. In order to design complex computer networks, people adopt a hierarchical method to transform large and complex problems into several small local problems.

The above are all the contents of the architecture adopted by the computer network system. Thank you for your reading. Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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