COM_WORD_1
ssid
Service Set Identifier
(networking) (SSID) A 32-character unique identifier that distinguishes one wireless network from another. All devices attempting to connect to a specific network use the same SSID, which appears in the header of packets. Because an SSID can be intercepted, it does not supply any security to the network.
Last updated: 2009-01-23
packet
The unit of data sent across a network. “Packet” is a generic term used to describe a unit of data at any layer of the OSI protocol stack, but it is most correctly used to describe application layer data units (“application protocol data unit”, APDU).
See also datagram, frame.
datagram
A self-contained, independent entity of data carrying sufficient information to be routed from the source to the destination computer without reliance on earlier exchanges between this source and destination computer and the transporting network.
See also connectionless, frame, packet.
handshake
handshaking
- Predetermined hardware or software activity designed to establish or maintain two machines or programs in synchronisation. Handshaking often concerns the exchange of messages or packets of data between two systems with limited buffers. A simple handshaking protocol might only involve the receiver sending a message meaning “I received your last message and I am ready for you to send me another one.” A more complex handshaking protocol might allow the sender to ask the receiver if he is ready to receive or for the receiver to reply with a negative acknowledgement meaning “I did not receive your last message correctly, please resend it” (e.g. if the data was corrupted en route).
Hardware handshaking uses voltage levels or pulses on wires to carry the handshaking signals whereas software handshaking uses data units (e.g. ASCII characters) carried by some underlying communication medium.
Flow control in bit-serial data transmission such as EIA-232 may use either hardware or software handshaking.
- The method used by two modems to establish contact with each other and to agreee on baud rate, error correction and compression protocols.
- The exchange of predetermined signals between agents connected by a communications channel to assure each that it is connected to the other (and not to an imposter). This may also include the use of passwords and codes by an operator.
[Jargon File]
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