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Overview: Most anyone who uses a PC no doubt sees the little clock at the bottom of the screen, dutifully ticking off the minutes of the passing day. But chances are they don’t often think about the role that clock plays in the network to which the PC is attached. In fact, virtually every piece of equipment attached to a data network has a similar clock, although it may not actually show the time of day to anyone. Until, that is, something goes wrong. Should a portion of the network go down, the clocks on every network device suddenly take on added importance. This paper discusses the role of security and accurate time synchronization: establishes the correct “when” of historical (past) events, allows ordering of future planned events, and enables synchronized, real-time interaction between network devices and processes.
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