In tcp/ip udp is connection less , why?

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  • Oct 12th, 2006

The UDP is connectionless is because,Packets are sent over the network without regard to whether they actually arrive at their destinations. There are no acknowledgments or guarantees, but you can send a datagram to many different destinations at the same time. Connectionless protocols are fast because no time is used in establishing and tearing down connections. Connectionless protocols are also referred to as best-effort protocols.

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Jai Singh

  • Dec 29th, 2006

TCP is Reliable But UDP is not Reliable

TCP Sent it's packet in it's arriving order

UDP Has No order

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  • Feb 15th, 2007


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Hi friends...
?TCP/IP is a protocol suite. where it has five layers namely
?????????? application layer,
?????????? transport layer,
?????????? network layer,
?????????? datalink layer,
?????????? and physical layer..

whereas UDP is a proyocol used in transport layer for unreliable and connectionless transfer of packets.
??? and TCP is another protocol used in transport layer for reliable and connection oriented ?transfer of packets.

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Main reason is that the internet is made of so many heterogeneous networks that it is
almost impossible to create a connection from the source to the destination without knowing the nature of tehe networks in advance......

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I know that for TCP/IP: the session layer will send SYN to start a connection with the peer end.

but as UDP/IP is a connectionless protocol, I think it doesn't use session layer, right?

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  • Jan 19th, 2013

In UDP, one important process is not done during the data transfer ..i.e windowing or Acknowledgement. But in TCP, windowing or Acknowledgement process is there. So Tcp is Connection oriented and UDP is collection less protocal.

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  • Mar 14th, 2013

In Transport Layer,
Two Way Communication,
Connection Oriented.
Connectionless is Used For Small Distance,
It is not reliable for big betwork, No Ack Received, No security

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  • Mar 29th, 2013

UDP is connectionless because it does not initiate with a three-way handshake. It is least concerned about whether destination received data or not.

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Goutham Shan

  • May 27th, 2013

For fast transmission UDP is used as it does not require any ACK .

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  • Sep 12th, 2013

Udp is connectionless network is used for small network,which less secure,no acknowledgement

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  • Oct 11th, 2016

TCP is a connection oriented protocol and UDP is a connection less protocol and then TCP is secured but UDP unsecured.

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