Asked by: Marilin Mialdea
technology and computing internet of things

Why is UDP needed?

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UDP reduces overhead because it does not addflowcontrol, error control, or sequence deliveryunlikeconnection-oriented services. UDP is used forthetransmission of data in which delivery of the data ismoreimportant than accuracy. Therefore, UDPisneeded.


Consequently, why do we need UDP?

UDP can be used in applicationsthatrequire lossless data transmission when the applicationisconfigured to manage the process of retransmitting lost packetsandcorrectly arranging received packets. This approach can helptoimprove the data transfer rate of large files comparedtoTCP.

Furthermore, why UDP is unreliable protocol? Streaming media such as video,audio and othersuseUDP because it offers speed. The reason UDP isfasterthan TCP is because there is no form of flow control. Noerrorchecking,error correction, or acknowledgment is donebyUDP.UDP is only concerned with speed.

Also to know, why would an application use UDP instead of TCP?

Because UDP does not employ congestioncontrol,but TCP does, it can take away capacity fromTCP thatyields to UDP flows. The result is thatUDP can:Achieve higher throughput than TCP as long asthe networkdrop rate are within limits that the applicationcan handle.Deliver packets faster than TCP withlessdelay.

What does UDP mean?

User Datagram Protocol (UDP) is part oftheInternet Protocol suite used by programs running ondifferentcomputers on a network. UDP is used to send shortmessagescalled datagrams but overall, it is an unreliable,connectionlessprotocol. UDP is officially defined inRFC 768 andwas formulated by David P. Reed.

Related Question Answers

Sandy Vinot

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What layer is UDP?

TCP and UDP are transport layerprotocolsand as such exist at layer 4 of the OSI model abovetheNetwork Layer and below theSessionLayer.

Taysa Glockenthor

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Does Netflix use UDP?

For non real time video streaming, likeNetflix,Hulu, Youtube, etc. they just use TCP anddobuffering instead of UDP, since they don't careabout a fewseconds delay between the server and client. That said,one of themost popular video streaming protocols that is basedonUDP/IP is RTP.

Dorica Carroio

Professional

Is UDP better than TCP?

UDP is efficient for broadcast and multicasttypeof network transmission. TCP is reliable as itguaranteesdelivery of data to the destination router. UDPisfaster, simpler and more efficient thanTCP.Retransmission of lost packets is possible in TCP,but notin UDP.

Haifen Zhorzhev

Explainer

What is the advantage of UDP over TCP?

First, one of the attractive features of UDPisthat since it does not need to retransmit lost packets nor doesitdo any connection setup, sending data incurs less delay. Thislowerdelay makes UDP an appealing choice fordelay-sensitiveapplications like audio and video.

Assad Hellmes

Explainer

Which is better TCP or UDP?

UDP. Faster Speed – UDP VPNserviceoffers significantly greater speeds than TCP. Forthisreason it is the preferred protocol when streaming HD videosordownloading torrents/p2p . Lower Reliability – Onrareoccasions UDP can be less reliable that TCPVPNconnections as UDP does not guarantee the deliveryofpackets.

Cristofher Putten

Explainer

Which applications use UDP protocol?

Following implementations uses UDP as a transportlayerprotocol:
  • NTP (Network Time Protocol)
  • DNS (Domain Name Service)
  • BOOTP, DHCP.
  • NNP (Network News Protocol)
  • Quote of the day protocol.
  • TFTP, RTSP, RIP, OSPF.

Mouhamet Erl

Pundit

How does UDP protocol work?

UDP works on top of the IP protocol.InUDP the sender constructs a datagram packet and addressitwith a port number(the IP address of course belongs to theIPprotocol and not UDP). The data the sender wantstotransmit is also appened to the datagram. The application willhaveto deal with splitting up the data.

Abdallahi Tunkl

Pundit

What is the size of UDP header?

8 bytes

Katelin Herencias

Pundit

Where is UDP used?

UDP (User Datagram Protocol) is anthercommonlyused protocol on the Internet. However, UDPis neverused to send important data such as webpages,databaseinformation, etc; UDP is commonly used forstreamingaudio and video.

Lashandra Marchais

Pundit

Is UDP secure?

UDP has no connection, so you can forge apacketwith an arbitrary IP address and it should get to theapplication.So in that sense, TCP is more "secure" thanUDP.Depending on the application, this may or may not berelevant tosecurity.

Mohsen Ahsan

Pundit

How reliable is UDP?

UDP by itself isn't reliable. Thedataacknowledge/retransmission functions have to occur at ahigher(i.e. application) level. TFTP is a good example of that.WhileUDP is not reliable, a lot of protocols use itas abase and add reliability at applicationlevel.

Egidijus Sualdea

Teacher

Is http UDP or TCP?

HTTP uses TCP because the files,images,web pages which we get from the remote host should not bedroppedon the way and it should be delivered in order to theHTTPclient. HTTP could also use UDP butusually not, if aUDP packet containing the first part of aweb page is lost,then its not retransmitted.

Turid Zheludkov

Teacher

Is UDP bidirectional?

They are TCP or Transmission Control ProtocolandUDP or User Datagram Protocol. TCP is connectionoriented– once a connection is established, data can besentbidirectional. UDP is a simpler,connectionlessInternet protocol. Multiple messages are sent aspackets in chunksusing UDP.

Imene Hassenplug

Teacher

Is TCP built on UDP?

If you're asking if TCP can be implementedinUDP, the answer is no. Both TCP and UDParebuilt on top of the IP, but the TCP usesdifferentpacket structure and at the layer-2 it is not possible tomimic theTCP using UDP packets.

Vlademir Bukowsk

Teacher

Is SIP TCP or UDP?

SIP clients typically use TCP or UDPonport numbers 5060 or 5061 for SIP traffic to serversandother endpoints. Port 5060 is commonly used fornon-encryptedsignaling traffic whereas port 5061 is typically usedfor trafficencrypted with Transport Layer Security(TLS).

Jessenia Saber

Reviewer

What is TCP and UDP port?

TCP (Transmission Control Protocol) isconnectionoriented, whereas UDP (User Datagram Protocol)isconnection-less. This means that TCP tracks all datasent,requiring acknowledgment for each octet (generally). Becauseofacknowledgments, TCP is considered a reliable datatransferprotocol.

Cathrine Kirtley

Reviewer

How UDP connection is established?

Protocol Header
A computer may send UDP packets withoutfirstestablishing a connection to the recipient.SourcePort (UDP packets from a client use this as a serviceaccesspoint (SAP) to indicate the session on the local clientthatoriginated the packet. UDP packets from a server carrytheserver SAP in this field)

Masood Niccolini

Reviewer

Is UDP checksum required?

Unlike the TCP checksum, the UDPchecksumis optional; the value zero is transmitted inthechecksum field of a UDP header to indicatetheabsence of a checksum. If the transmitter reallycalculatesa UDP checksum of zero, it must transmit thechecksumas all 1's (65535).

Ardis Chuvatkin

Reviewer

What is UDP timeout?

UDP Timeout refers to the amount of timeaUDP Pinhole stays open on a Firewall or Router. Dependingonyour equipment this timeout can range from a few secondstomany minutes. Most devices fall under the minute(s) range.Werecommend UDP Timeout to be set at 30 or60seconds.

Co-Authored By:

EveryThingWhat Staff Editor

13

22nd March, 2020

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