NTP principles

NTP synchronizes timekeeping among a set of distributed time servers and clients. In this manner, the clock of the host is synchronized with certain time standards. The server and client are two relative concepts. The device that announces the willingness to synchronize clocks and provides the standard time is a server; the device that announces its willingness to be synchronized is a client. A local system running NTP can be synchronized by other clock sources or acts as a clock source to synchronize other clocks. In addition, mutual synchronization can be implemented through NTP packet exchanges. NTP uses UDP transmission.

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