What is NTP?
NTP, or Network Time Protocol is a UDP-based protocol on port 123 that allows computers to sync their time over the internet. NTP servers have different levels on a hierarchy based system, or stratums, with the highest at 0 being the reference clock sources that are not made public and are connected directly to stratum 1 servers, and so on and so forth. Endpoints such as your phone, computer, router, etc, can connect to any server at or below stratum 1.
What Is the NTP Pool?
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