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Open Datalink Interface (ODI) A driver specification, developed by Novell, that enables a single workstation to communicate transparently with several different protocol stacks, using a single NIC and a single NIC driver.

OpenLinux A version of the Linux network operating system developed by Caldera.

Open Systems Interconnect (OSI) A model defined by the ISO to categorize the process of communication between computers in terms of seven layers. The seven layers are Application, Presentation, Session, Transport, Network, Data Link, and Physical. See also International Organization for Standardization.

OSI See Open Systems Interconnect.

oversampling Method of synchronous bit synchronization in which the receiver samples the signal at a much faster rate than the data rate. This permits the use of an encoding method that does not add clocking transitions.

overvoltage threshold The level of overvoltage that will trip the circuit breaker in a surge protector.

packet The basic division of data sent over a network.

packet filtering A firewall technology that accepts or rejects packets based on their content.

packet switching The process of breaking messages into packets at the sending router for easier transmission over a WAN. See also frame relay.

passive detection A type of intruder detection that logs all network events to a file for an administrator to view later.

passive hub A hub that simply makes physical and electrical connections between all connected stations. Generally speaking, these hubs are not powered.

password history List of passwords that have already been used.

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