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PSDN: Short for packet-switched data network, a data communications network that is based on the principles of packet switching, as opposed to circuit switching that is used in public telephone networks. Packet-switched networks do not establish physical communication channels between communicating devices like circuit-switched networks do. Instead, signals are formed into fixed-length packets that are affixed with a source and destination address and packet ordering details. The packets then rely on network routers to read the address data and route the packets through the network to their destinations. When the packets arrive at the receiving device, the packet ordering data is used to reassemble the original signal. One advantage of packet-switched networks is that packets from different sources going to different destinations can share common data pathways. COLD BOOT: The
start-up of a computer from a powered-down, or off, state. Also called a
hard boot. ETRN: Short for
Extended Turn, an extension to the SMTP mail delivery protocol that
allows an SMTP server to request from another SMTP server any e-mail
messages it has for a specific domain. ETRN typically is used to
retrieve e-mail messages from a mail server that does not have a
dedicated connection to the Internet. ETRN can only be used in
conjunction with an ISP that supports ETRN. |
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