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User Datagram Protocol (UDP) and provides file writing and reading, but it does not
provide directory service and security features.
U
UDP
UDP is an acronym for User Datagram Protocol. It is a communications protocol that uses
the Internet Protocol (IP) to exchange the messages between computers.
UDP is an alternative to the Transmission Control Protocol (TCP) that uses the Internet
Protocol (IP). Unlike TCP, UDP does not provide the service of dividing a message into
packet datagrams, and UDP doesn't provide reassembling and sequencing of the packets.
This means that the application program that uses UDP must be able to make sure that
the entire message has arrived and is in the right order. Network applications that want to
save processing time because they have very small data units to exchange may prefer
UDP to TCP.
UDP provides two services not provided by the IP layer. It provides port numbers to help
distinguish different user requests and, optionally, a checksum capability to verify that the
data arrived intact.
Common network applications that use UDP include the Domain Name System (DNS),
streaming media applications such as IPTV, Voice over IP (VoIP), and Trivial File Transfer
Protocol (TFTP).
User Priority
User Priority is a 3-bit field storing the priority level for the 802.1Q frame. It is also known
as PCP.
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