oes-ntp-work"><a class="header" href="#how-does-ntp-work">How does NTP work?</a></h1>
<p>NTP utilises a hierarchy system. Each clock is assigned a <em>stratum</em>. Stratum values range between 0 and 15, with a value of 16 denoting an unsynchronised clock. Devices of Stratum 0 are called reference clocks and these are one of the most accurate time-keeping machines such as atomic clocks. The stratum value, therefore, represents the distance from the reference clock or how accurate a given clock is in compari