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NTP Time Synchronization

Simple

The stratum hierarchy

NTP uses a stratum (layer) system. Lower = more accurate:

Stratum 0 — physical clocks (GPS, atomic, radio). Not directly accessible over the network. Stratum 1 — servers connected directly to Stratum 0. Accurate to microseconds. Stratum 2 — synced from Stratum 1. Public pool servers (pool.ntp.org). Stratum 3+ — your computer, synced from Stratum 2.

Packets in motion — click to inspect:

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