NETWORK TIME PROTOCOL (NTP)

The network time protocol (NTP), published in Request for Comments (RFC) 1119, is used for time-stamping operations.

Clocking information for a network is provided through the primary time server designated as a root. The time server obtains its clocking information from master sources. In the United States, this is usually one of three sources:

  • Fort Collins, Colorado: Station WWV operated by the National Institute of Standards and Technology (NIST) uses high frequency (HF) frequencies

  • Kauai, Hawaii: Station WWVH operated by NIST, also uses HF frequencies

  • Boulder, Colorado: Station WWVB uses low frequency transmissions

The primary and secondary time servers to calculate clock offsets and correct clocking inaccuracies. ...

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