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UDP
User Datagram Protocol - A connectionless transport protocol that runs on top of TCP/IP's
IP. UDP, like TCP, uses IP for delivery; however, unlike TCP, UDP provides for exchange
of datagram without acknowledgments or guaranteed delivery. Best suited for small,
independent requests, such as requesting a MIB value from an SNMP agent, in which first
setting up a connection would take more time than sending the data.
UNI signaling
User Network Interface signaling for ATM communications.
Virtual Connection (VC)
A link that seems and behaves like a dedicated point-to-point line or a system that delivers
packets in sequence, as happens on an actual point-to-point network. In reality, the data is
delivered across a network via the most appropriate route. The sending and receiving
devices do not have to be aware of the options and the route is chosen only when a
message is sent. There is no pre-arrangement, so each virtual connection exists only for
the duration of that one transmission.
WAN
Wide area network - A data communications network that spans any distance and is usually
provided by a public carrier (such as a telephone company or service provider).
