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Xiaobian to share with you what is the use of UDP and TCP protocols in Python, I believe most people still do not know how, so share this article for everyone's reference, I hope you have a lot of gains after reading this article, let's go to understand it together!

UDP and TCP are both transport layer protocols, but they are somewhat different. TVP provides reliable data transmission in IP environment, it is implemented as a channel for sending data out of the connection, and then data transmission. UDP does not provide reliability, flow control, or error recovery for IP. How are UDP and TCP defined? What is the application scenario? The following small series will be analyzed in detail for everyone.

UDP Introduction

UDP -User Datagram Protocol is a connectionless, simple datagram-oriented transport layer protocol. UDP does not provide reliability; it simply sends datagrams that the application passes to the IP layer, but it does not guarantee that they will reach their destination. Because UDP does not establish a connection between client and server before transmitting datagrams, and there is no mechanism such as timeout retransmission, the transmission speed is very fast.

UDP is a connectionless oriented protocol, each datagram is a separate message, including the complete source address or destination address, it is transmitted to the destination in any possible path on the network, so whether it can reach the destination, the time to reach the destination and the correctness of the content cannot be guaranteed.

UDP Features:

UDP is a connectionless communication protocol. UDP data includes destination port number and source port number information. Since communication does not require connection, broadcast transmission can be realized. UDP has a size limit for transmitting data, and each datagram transmitted must be limited to 64KB. UDP is an unreliable protocol in which datagrams sent by a sender do not necessarily arrive at the receiver in the same order.

[Application]

UDP is a message-oriented protocol, communication does not need to establish a connection, data transmission is naturally unreliable, UDP is generally used for multi-point communication and real-time data services, such as

Voice broadcast, video, QQ, TFTP(simple file transfer), SNMP(simple network management protocol), RIP(routing information protocol, such as reporting stock market, aviation information), DNS(domain name interpretation), pay attention to speed fluency.

UDP is simple to operate and requires less supervision, so it is usually used for client/server applications in distributed systems with high reliability in a local area network. For example, video conferencing systems do not require audio and video data to be absolutely correct, as long as continuity is guaranteed. In this case, it is obviously more reasonable to use UDP.

TCP related introduction

udp communication model

In udp communication model, before communication starts, there is no need to establish relevant links, just send data, similar to "writing letters" in life.

TCP communication model

In udp communication model, before communication starts, relevant links must be established before data can be sent, similar to "calling" in life.

Do you know UDP and TCP? UDP is simply a connectionless protocol that does little more than give applications the ability to send packets and allow them to structure their own protocols below the desired hierarchy. TCP, on the other hand, is a connection-oriented protocol that does almost everything, establishes connections, increases reliability through retransmission mechanisms, and also performs flow control and congestion control on behalf of the application that uses it.

The above is "What is the use of UDP and TCP protocols in Python?" All the contents of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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