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Editor to share with you what udp refers to the agreement, I believe that most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to understand it!

Udp is a user packet protocol and a connectionless transport layer protocol in the OSI reference model, which provides transaction-oriented simple and unreliable information transmission services. UDP is used to support those network applications that need to transfer data between computers; many client / server mode network applications, including network video conference system, need to use UDP protocol.

The transport layer of Internet has two main protocols that complement each other. Connectionless is UDP, which does little more than send packet functionality to applications and allow them to structure their own protocols at the desired level. The connection-oriented is TCP, which does almost everything.

UDP is the abbreviation of User Datagram Protocol, the Chinese name is user Datagram protocol, and it is a connectionless transport layer protocol in the reference model of OSI (Open System Interconnection). It provides transaction-oriented simple and unreliable information transmission service. IETF RFC 768 is the official specification of UDP. The protocol number of UDP in the IP message is 17.

UDP protocol, like TCP protocol, is used to process packets. In the OSI model, both are located in the transport layer, one layer above the IP protocol. UDP does not provide packet grouping, assembly and sorting of packets, that is to say, when a message is sent, it is impossible to know whether it arrives safely and completely. UDP is used to support network applications that need to transfer data between computers. Many client / server mode network applications, including network video conference system, need to use UDP protocol. UDP protocol has been used for many years since it came out. Although its initial brilliance has been overshadowed by some similar protocols, UDP is still a very practical and feasible network transport layer protocol.

Many applications only support UDP, such as multimedia data streams, do not generate any additional data, and do not resend packets that are known to be corrupted. When emphasizing transmission performance rather than transmission integrity, such as audio and multimedia applications, UDP is the best choice. When the data transmission time is so short that the previous connection process has become the main body of the entire traffic, UDP is also a good choice.

Content:

UDP is a connectionless transport layer protocol in the OSI reference model. It is mainly used in transmissions that do not require sequential arrival of packets. The inspection and ordering of packet transmission order is completed by the application layer [4] to provide transaction-oriented simple and unreliable information transmission services. UDP protocol is basically the interface between IP protocol and upper layer protocol. The UDP protocol applies to multiple applications whose ports are running on the same device.

UDP provides connectionless communication, and does not guarantee the reliability of transmission packets, so it is suitable for transmitting a small amount of data at one time. The reliability of UDP transmission is responsible for by the application layer. The commonly used UDP port numbers are: 53 (DNS), 69 (TFTP), 161 (SNMP), and the use of UDP protocols include: TFTP, SNMP, NFS, DNS, BOOTP.

UDP message has no reliability guarantee, sequence guarantee and flow control field, so its reliability is poor. However, because of the few control options of UDP protocol, it is suitable for applications that do not require high reliability, such as DNS, TFTP, SNMP and so on because of its small delay and high data transmission efficiency.

Features:

In order to recognize multiple destination addresses on a given host, allow multiple applications to work on the same host and send and receive data packets independently, a user Datagram protocol UDP is designed.

UDP uses the underlying Internet protocol to transmit messages and provides unreliable connectionless packet transmission services like IP. It does not provide packet arrival confirmation, sorting, and flow control functions.

UDP Helper can relay the broadcast message of the designated UDP port, which converts the broadcast message of the designated UDP port into a unicast message and sends it to the designated server, which plays the role of relay.

The above is all the contents of the article "what Protocol does udp refer to". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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