Planet ADW-4401 User Manual download pdf (Page 81)

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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Planet ADW-4401 User Manual Page 81