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5.2.1. NTP Stratum Levels

StratumSourceExample
0Reference clockAtomic clock, GPS
1Directly connected to Stratum 0Time server
2Synchronized to Stratum 1Enterprise NTP server
3+Each hop adds one stratum (15 is the highest usable)Network devices
16Unsynchronized, no valid time sourceA device that cannot reach its server
See how it connects
Alvin Varughese
Written byAlvin Varughese
Founder•20 professional certifications