The networking is keep all devices synchronized to the correct time. Incorrect network time and lack of synchronizations can play havoc with system processes and can lead to untold errors and problems debugging. To ensure devices are continually checked to prevent drift can also lead to a synchronized network slowly becoming unsynchronized and leading to the kinds of problems aforementioned. A network not only has the correct time but that time is not drifting is achieved using the time protocol NTP (Network Time Protocol). The NTP is not the only time synchronization protocol but it is by far the most widely used and to open source protocol but is continually updated by a large community of Internet time keepers. NTP based around an algorithm that can work out the correct and most accurate time from a range of sources and allows a single time source to be used by a network of hundreds and thousands of machines and it can keep each one accurate to that time source to within a few milliseconds. So the easy way of synchronizing a network with NTP is to use a NTP time server, also known as a network time server. The NTP servers use an external source of time, either from the GPS network (Global Positioning System), or from broadcasts from national physics laboratories such as NIST in the US or NPL in the UK.

 

NTP will distribute this atomic clock time to all devices on a network it will then keep checking each device to ensure there is no drift and correcting the device if there is. For the time signals are generated by atomic clocks which are many times more accurate than the clocks on computers and servers.