NTP :Network Time Protocol
ABSTRACT
NTP (Network Time Protocol) is an implementation of the TCP/IP network protocol with the same name. NTP has been initiated in the 1980's by Dave .L. Mills who was trying to achieve a high accuracy time synchronization for computers across the network.. Since that time NTP has been enhanced and is now widely used around the world. The protocol supports an accuracy of time down to nanoseconds. However, the real accuracy which can be achieved also depends on the operating system and the network performance.
Currently there are two versions of NTP which can be used intermixed: NTP v3 is the latest released version which runs very stable on many operating systems. NTP v4 has some enhancements over v3 and has better support for some operating systems. Additionally, there's also a simplified version of the protocol called SNTP (Simple Network Time Protocol). SNTP uses the same TCP/IP packet structure like NTP but due to the simpler algorithms, it provides only very reduced precision. The NTP package contains a background program (daemon or service) which synchronizes the computer's system time to one or more external reference time sources which can be either other devices on the network, or a radio clock which is connected to the computer.
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