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Telnet
The virtual terminal protocol in the Internet suite of protocols - Allows users of one
host to log into a remote host and act as normal terminal users of that host.
Transparent bridging
The intelligence necessary to make relaying decisions exists in the bridge itself and is
thus transparent to the communicating workstations. It involves frame forwarding,
learning workstation addresses, and ensuring no topology loops exist (in conjunction
with the Spanning-Tree algorithm).
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).
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