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тАО09-06-2004 09:33 PM
тАО09-06-2004 09:33 PM
Why is UDP needed?
Thanks
Eric
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тАО09-06-2004 09:48 PM
тАО09-06-2004 09:48 PM
Re: Why is UDP needed?
What a big question !
TCP and UDP are so different, that sometimes, the first is better, and sometimes, is is the second.
For example, redirecting syslog to a central server is possible (only) via udp : it is quickly (just a message) and don't have to be secure : if the message don't arrive to the server, it is not so important ...
Olivier.
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тАО09-06-2004 09:57 PM
тАО09-06-2004 09:57 PM
Re: Why is UDP needed?
1.An UDP datagram is used in Network File System (NFS), DNS, SNMP, TFTP etc.
2. It has no handshaking or flow control
3. It not even has windowing capability
4. It is a fire and forget type protocol.
5. Real time application like video conferenicing needs udp (B'coz it's faster)
6.An application can use a UDP port number and another application can use the same port number for a TCP session from the same IP address.
it has it's own advantages other than lack of sequencing, error control and more
RFC 768 describes UDP in detail.
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тАО09-06-2004 09:59 PM
тАО09-06-2004 09:59 PM
Re: Why is UDP needed?
UDP is used, for exemple, by the web listeners in Oracle E-Business Suite...
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тАО09-06-2004 10:13 PM
тАО09-06-2004 10:13 PM
Re: Why is UDP needed?
1. Checking aknowledgement
2. Sending steam data's and using policy of "Positive aknowledgement and Retransmission method"
3. Flawless packet transmission
4. Flow controlled data transcation
UDP is needed for,
1. Minimal amount of header informations for every packet
2. Efficient packet transmission
3. Minimal system call usage for operations
see man tcp / udp for this more.
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тАО09-06-2004 11:26 PM - last edited on тАО04-07-2017 03:45 AM by VidyaVI
тАО09-06-2004 11:26 PM - last edited on тАО04-07-2017 03:45 AM by VidyaVI
Re: Why is UDP needed?
Hi Eric,
Take a look at these links:
[broken links removed on <4/7/2017> by Mod]
HTH.
Regards,
Sri Ram
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тАО09-07-2004 02:44 AM
тАО09-07-2004 02:44 AM
Re: Why is UDP needed?
Do the above responses answer your questions or is there some other specific information about UDP that you're still looking for?
As stated above, the main reasons why some application implementers (like the original NFS design team) used UDP was because of it's speed and low overhead. As TCP implementations improved over the years, most applications have switched to using TCP but some still offer a UDP variant.
If there is some specific piece of information you're looking for regarding UDP vs. TCP please let me know.
Regards,
Dave
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
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тАО09-07-2004 12:11 PM
тАО09-07-2004 12:11 PM
Re: Why is UDP needed?
As for multimedia stuff - they want UDP not because UDP is faster - sometimes UDP isn't really faster - but because they can tolerate the occasional unrecovered packet loss, but cannot tolerate a 500 millisecond or more "hiccup" in the data flow that a TCP retransmission would take.
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тАО09-07-2004 02:19 PM
тАО09-07-2004 02:19 PM
Re: Why is UDP needed?
This problem is from Entrance Exam of MIS. I don't know the relation between first and second. Do you have any idea?
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тАО09-07-2004 02:29 PM
тАО09-07-2004 02:29 PM
Re: Why is UDP needed?
You should check "Seven Layer OSI".UDP/TCP is working on transport layer which are layer 4 and IP is working on network layer which are layer 3.
Basically you need to unserstabd the concept of this seven layer.
regards
mB