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: Devices that sync from the level above them. NTP supports up to 15 strata, though accuracy slightly decreases with each hop. Technical Architecture and Performance

: These are high-precision timekeeping devices like atomic clocks , GPS satellites, or radio clocks. They do not connect to the network directly but are attached to Stratum 1 servers. : Devices that sync from the level above them

The is one of the oldest and most vital pillars of the modern internet. Developed by Dr. David L. Mills in the mid-1980s, it ensures that computer clocks across diverse networks remain synchronized to a common time reference. Without NTP, global financial transactions, security logs, and distributed cloud systems would fall into chaos due to time drift. How NTP Works: The Stratum Hierarchy They do not connect to the network directly

: Servers directly connected to Stratum 0 devices. They act as the primary network time standards. David L

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: Servers that synchronize their time with Stratum 1 servers. Most public NTP servers, like those in the NTP Pool Project (pool.ntp.org), operate at this level.

NTP organizes time sources into a hierarchical "stratum" structure to maintain accuracy and reliability: