hronize clocks of
Internet hosts.</li>
<li>The <a href="https://www.usenix.org/system/files/conference/nsdi18/nsdi18-geng.pdf"><span style="font-variant: small-caps">Huygens</span></a>
family of software algorithms can achieve accuracy to a few tens of
nanoseconds in scalable server farms without special hardware.</li>
<li>The <a
href="https://www.nist.gov/intelligent-systems-division/ieee-1588">Precision
Time Protocol</a> (<abbr
title="Institute of Electrical and Electronics Engineers">IEEE</abbr> 1588)
ca