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security policy Rules set in place by a company to ensure the security of a network. This may include how often a password must be changed or how many characters a password should be.

segment A unit of data smaller than a packet. Also refers to a portion of a larger network (a network can consist of multiple network segments).

See also backbone.

self-powered A device that has its own power.

sequence number A number used to determine the order in which parts of a packet are to be reassembled after the packet has been split into sections.

Sequenced Packet exchange (SPX) A connection-oriented protocol that is part of the IPX protocol suite. It operates at the Transport layer of the OSI model. It initiates the connection between the sender and receiver, transmits the data, and then terminates the connection. See also Internet Packet eXchange, Open Systems Interconnect.

Serial Line Internet Protocol (SLIP) A protocol that permits the sending of IP packets over a serial connection.

server A computer that provides resources to the clients on the network.

server and client configuration A network in which the resources are located on a server for use by the clients.

server-centric A network design model that uses a central server to contain all data as well as control security.

service Services add functionality to the network by providing resources or doing tasks for other computers. In Windows 9x, services include file and printer sharing for Microsoft or Novell networks.

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