A group of communication in a computer network is multicasting, where a sender sends data to multiple receivers simultaneously. Simply in Multicasting we send data across a computer network to several users at the same time. It supports one-to-many and many-to-many data transmission across LANs or WANs.
The most common protocol (transport layer protocol) to use multicast addressing is User Datagram Protocol (UDP).
User datagram protocol is defined as the simplest transport layer communication protocol available of the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite. It is one of the core members of the Internet protocol suite. It Increases the speed transmissions by enabling the transfer of data before an agreement is provided by the receiving party.
User datagram protocol is one of the low-level TCP/IP protocols. Multicasting is one of the useful techniques to send messages to a group on a periodic basis. It uses a User datagram protocol server and one or more clients.
Multicasting will send an identical message to every member of a group. A group is identified by a multicast address. This protocol is commonly used for applications that can handle some packet loss, such as streaming audio and video.
The purposes of using UDP are as follows −
The main purpose of the user datagram protocol is to facilitate the exchange of messages between computing devices in a network. UDP is very useful where we have to send a fixed formatted email to all the clients within a campus so here UDP is useful so this is the purpose of user datagram protocol. UDP is among the oldest network protocols still in use.
UDP is faster than TCP, because there is no form of flow control, no error checking, error correction, or acknowledgment is done by UDP. It is only concerned with speed. So, when the data sent over the internet is affected by collisions, errors will be present.
UDP is suitable for purposes where error checking and correction are either not necessary or are performed in the application. UDP avoids the overhead of such processing in the protocol stack. It is also used for query-response applications, such as DNS queries.
One of the best purposes of using UDP is to establish low-latency and loss-tolerating connections between applications on the internet. That will profit us in the sense of spreading a large amount of message in a single region. And it will be secure.
One other purpose of using UDP is that it speeds up transmissions by enabling the transfer of data before an agreement is provided by the receiving party so that they can’t blame us when losing data or secrets.
The features of UDP are as follows −
UDP is a suitable protocol for streaming applications such as VoIP, multimedia streaming.
It is a good protocol for data flowing in one direction.
It does not even have windowing capability.
It provides connectionless, unreliable service and so UDP is faster than TCP.
It does not care about the delivery of the packets or the sequence of delivery.
It does not provide a congestion control mechanism.
It is simple and suitable for query-based communications.
It is used in Network File System (NFS), Domain Name System (DNS), and Simple Network Management Protocol (SNMP) etc.
One of the best features is it adds only checksum and process to process addressing to IP.
There is no connection establishment tear down, data is just sent forward.