User Datagram Protocol Udp
User Datagram Protocol Udp
Hi, I'm learning the basics on the net, I face this question can help anyone?
Some applications use the Internet Protocol User Datagram (UDP) for the purpose of establishment, as opposed to Transmission Control Protocol (TCP). Why and what applications you use?
TCP and UDP are protocols in layer 4 (Transport) of the OSI reference model. Refer to the delivery of information to the end user. TCP is a connection-oriented protocol and requires a handshake three-way and provides for the establishment of the connection between systems and provides for error-free communications. UDP is a protocol offline. It requires no connection setup, it merely provides packets to a target system. As such, it has less overhead, is faster, but has no error correction, and no way to detect if a packet is dropped. The application that uses UDP must do all that work by itself. Some programs as DNS uses TCP and UDP, others only use TCP and UDP only a few. UDP: Network File System (NFS), Simple Network Management Protocol (SNMP), Domain Name System (DNS), Trivial File Trannsfer Protocol (TFTP) TCP: File Transfer Protocol (FTP), Hypertext Transfer Protocol (HTTP), Terminal Emulation Protocol (Telnet)
User Datagram Protocol Udp
The Technology Behind Webcasting
Streaming video and audio is the commonly used technology behind webcasting. The protocols applicable in this case are RTP (Real-time Transport Protocol) over UDP (User Datagram Protocol). Most webcast solutions are based on these protocols.
The Internet standard protocol for transport of data real time, including video and audio is RTP. This is used for Internet telephony, which is an interactive service, as well as for media-on-demand. RTP consists of two parts: a data and a control part. The control part is also known as Real-time Transport Control Part (RTCP).
Support of applications such as continuous media (audio and video webcasts) including content identification, loss detection, security and timing reconstruction is provided by the data part of RTP, which is a thin protocol.
webcast support for real-time conferencing of various sized groups within an internet is provided by the Real-time Transport Control Part. Multicast-to-unicast translators are supported by this, as are support for audio and video bridge gateways and source identification. Also supported is the synchronization of various streams of media. Quality of Service feed-back to the multicast group from receivers is also offered.
RTP relies on resource reservation protocols such as RSVP (ReSerVation Protocol) and does not address the issue of resource reservation or quality of service control. Resources are reserved along data paths at each node as a result of RSVP requests. This is true for webcast recording and for video webcasts as well.
User Datagram Protocol (UDP) is a core member of a set of internet protocols, called the Internet Protocol Suite. With UDP, datagrams (messages) can be sent from computers to an IP (Internet Protocol) network host. This can be done without prior communications to set up data paths or communication channels. A transmission model that is simple is used by UDP, without handshaking dialogues for ensuring data integrity, reliability or ordering. In a real-time system, where packets dropping are not an option as compared to delayed packets, UDP is used. This is true for all time-sensitive applications. In such cases, Stream Control Transmission Protocol (SCTP) or Transmission Control Protocol (TCP) is used as error control facilities at the interface level of the network.
Servers that answer a small number of queries from a large number of clients find the UDP’s stateless nature useful. UDP is also compatible with multicasting (send to all subscribers) and packet broadcast. UDP is used by network applications like online games, Trivial File Transfer Protocol (TFTP) and streaming media like VoIP (Voice over Internet Protocol).
About the Author
Barney Brown is a co-founder of http://www.workcast.co.uk. Since helping launch the business, he has been instrumental in the global adoption of WorkCast’s webcasting platform WebCast Manager and related managed services. He is responsible for Sales and Marketing operations which he manages from WorkCast’s U.K. headquarters.
Prior to co-founding WorkCast, he held a number of senior management positions in the IT and Telco industry, holding a number of Sales and Marketing positions at organisations including BMC Software, Experian QAS and Opal Telecom. Barney has a long and successful track record in starting, growing and managing effective direct and indirect sales channels. Barney has a 1st Class Honours degree in Marketing and Economics from the University of Wales, Aberystwyth.
What is the point of the UDP (User Datagram Protocol) to control you?
The UDP packet request again? If not, What is checkpoint? If so, when the package arrives out of order and, what is the point again? Thank you.
Checksum UDP to detect data corruption. The protocol itself does not require retransmission. It depends on the application. With most applications that use UDP, a datagram sometimes missing or damaged does not matter, as streaming audio or video. Corrupt or packet sequence is simply discarded. It would be too late to be of no use anyway. When data integrity is important, as the DNS, the client re-request data are not received on time or if it arrives damaged. The checksum determines whether or corrupt data is intact and therefore provides a useful service.
CCNA / CCENT Tutorial: TCP Vs. UDP
