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CompTIA® Linux+ / LPIC-1 Cert Guide: (Exams LX0-103 & LX0-104/101-400 & 102-400) by Sean Walberg, Ross Brunson

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Network Time Protocol

Fortunately it is easy to keep your clock in sync without manually fiddling with the clock. The Network Time Protocol (NTP) is a protocol that enables a computer to get its time from a remote server and to be accurate within milliseconds even if the network is unreliable. Coupled with NTP is a globally distributed network of freely usable servers that participate in the protocol.

Throughout the world are various clock sources, such as government agencies broadcasting the time over radio, high-quality cesium clocks, or devices that read the current time from satellites. These clocks are called reference clocks in the NTP system.

NTP servers that get their time directly from a reference clock are called stratum 1 servers ...

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