So, what is UDP or User Datagram Protocol? UDP is an web protocol for the transmission of brief messages called datagram. The User Datagram Protocol is just one part of a larger Web Protocol suite. UDP is used networks designed for TCP. However, UDP is less reliable and you aren’t all the time positive you’ll get the data in the proper sequence. David P. Reed formulated user Datagram Protocol in 1980.
To understand what UDP is, it’s best to first understand what a typical IP network looks like. A typical IP network has five layers. The primary layer is the physical layer, which consists of fiber optic, coaxial, or twisted cables. The second layer is the data link layer such as GPRS, Wi-Fi and ISDN. The third layer is the internet or the network layer. The forth layer is where UDP lies and this is the transport layer. The ultimate layer is the application layer and common functions are Telnet, HTTP, and DNS.
To understand UDP, you must note that with this protocol, there isn’t a requirement that the recipient of the info acknowledges that the data has been sent. There are not any implicit checks on transmission to guarantee datagram integrity and to ensure the right sequence is maintained. Although the shortage of transmission checks might make you doubt whether UDP is a useful protocol, you should note that in some applications, pace is more helpful than reliability. With UDP, errors are checked and corrected in the applications and not the network layer. At any time when error correction is required throughout transmission, the application uses the TCP, or Transmission Control Protocol, or the SCTP, or Stream Control Transmission Protocol. These protocols are designed for this actual reason.
To know UDP, you need to observe that the protocol is stateless. That is important for servers which are used by several clients to answer brief queries. UDP is due to this fact advantageous over TCP in that it can be used for multicasting or packet broadcasting where information is sent to different clients while TCP is simply used between one client and the server. Most of today?s network applications similar to VoIP, or Voice over Internet Protocol, DNS or Domain Name System, and TFTP or Trivial File Transfer Protocol use UDP because of this advantage. Since UDP doesn’t have a mechanism that can be used to avoid congestion in a network, there are a number of options which can be used. Probably the most frequent solutions is the Datagram Congestion Control Protocol, or DCCP.
Despite the good speed and the truth that UDP can be used by several clients, to understand UDP, you need to know the restrictions of the protocol. The most obvious limitations are the fact that there isn’t a avoidance mechanism and the truth that there is no congestion control. These are serious limitations and it means the protocol cannot be used where sensitive data is being transmitted. If a person sends you two messages through UDP, you can’t predict the one that can arrive first. To learn more about the protocol such as how checksum is used to check errors, the protocol is documented in IETF RFC 768.
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