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[Network Communication II] TCP reference model

2022-07-20 20:29:00 【Kangzai】

TCP Reference model

1、 background

Recently, I am engaged in network programming , I went to know before socket signal communication , Learning from examples . So I'm lucky to revisit the network model . Use the current knowledge reserve to relearn , It is found that it is much better than the previous understanding . At least it's much better than the former self who almost failed the course . Ha ha ha , Let's get straight to the point .

2、OSI Reference model

The basic model of network model is OSI Reference model , It is divided into 7 layer . The specific contents are as follows

From the top down	Layer name	effect	give an example
F7	application layer	Interface between application and network , Provide services directly to users	E-mail 、 Telnet Protocol
F6	The presentation layer	Responsible for data format conversion , Such as coding 、 Data format conversion and Encryption and decryption .	GBK Transcoding Utf-8 code
F5	The session layer	Manage and coordinate the communication between various processes on different hosts （ dialogue ）, Be responsible for the establishment of 、 Manage and terminate sessions between applications
F4	Transport layer	Provide reliable and transparent data transmission between communication hosts for upper layer protocol service , Including handling error control and flow control . Only on the communication host , No need to be on the road Handled by the device
F3	The network layer	Transfer data over the network to the destination address , Mainly responsible for addressing and routing Selected by	Routing table routing
F2	Data link layer	Responsible for the communication transmission between two interconnected hosts on the physical level , Will be made by 0 、 1 The bitstream is divided into data frames and transmitted to the opposite end , That is, the generation and reception of data frames
F1	The physical layer	Responsible for logic signals （ Bit stream ） And physical signals （ electric The signal 、 optical signal ） The conversion between , Provide physical connection for the data link layer through the transmission medium	wifi、 Ethernet, etc

2、TCP/IP Model

TCP/IP  It is a family of protocols developed for the use of the Internet , So the internet protocol is  TCP/IP.TCP/IP  There is only the difference between the four tier model and the five tier model . Specific view <2022 Graphic network > This book .

The following shows that TCP/IP How to encapsulate a data in the model , That is, how the message is generated .

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