what is a ntp server
NTP is a protocol designed to synchronize the clocks of computers over a network to a common timebase (usually UTC). NTP version 4 is a significant revision of the previous NTP standard, and is the current development version. It is specified by the following documents: 1  RFC 5905: Network Time Protocol Version 4: Protocol and Algorithms Specification.  RFC 5906: Network Time Protocol Version 4: Autokey Specification.