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5.2.1. NTP Stratum Levels
| Stratum | Source | Example |
|---|---|---|
| 0 | Reference clock | Atomic clock, GPS |
| 1 | Directly connected to Stratum 0 | Time server |
| 2 | Synchronized to Stratum 1 | Enterprise NTP server |
| 3+ | Each hop adds one stratum | Network devices |