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UDP
is a transport protocol
* UDP
provides communication between processes
* UDP
uses IP to deliver datagrams to the right host
* Connectionless
* No
session is established.
Does
not provide guaranteed delivery
* No
sequence numbers
* No
acknowledgements
* No
flow control
* No
error control
* Reliability
is the responsibility of the application. Uses Port numbers as endpoints to communicate
Applications
of UDP are: -
DNS
–Domain Name Services
SNMP-Simple
Network Management Protocol
TFTP
– Trivial File Transfer Protocol
RTP
– Real Time Protocol
Reason
for using UDP instead of TCP
TCP
is a complicated protocol involves:
* Flow
control
* Exchange
of acknowledgements etc.,
* Hence for
delay sensitive applications, TCP becomes inefficient; However TCP gives utmost
importance for reliability ( but at the cost of efficiency )
* There are many
applications which don’t demand reliability, but demand fast delivery
* Typically
audio / video streaming applications, where even loosing some bits doesn’t matter
In such cases UDP is
preferred
Figure:
- UDP Header
* Source
and destination port numbers
–
Client ports are ephemeral
–
Server ports are well-known
–
Max number of port number available is 65,535, since 16 bit is used to
represent
the port number.
–
* UDP
length
–
Total number of bytes in datagram (including header)
* UDP
Checksum (optional)
– Detects
errors in UDP datagram
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