NET 4000 Chapter Notes - Chapter 9.5.9: Ntpd, Systemd, Network Delay
Document Summary
The network time protocol (ntp) is used to synchronize system time between computers over a network connection. Ntp uses a hierarchy of clocks and computers for synchronizing the current time. Allows computers to be a time consumer and a time provider simultaneously, allowing computers to synchronize time hierarchically. Uses strata to define time providers in a hierarchy (levels of time providers): Stratum 0 devices are accurate clocks (such as atomic clocks) that provide the official utc time. Stratum 1 devices get their time from stratum 0 devices. Stratum 2 devices receive their time from stratum 1 devices, and can also provide time to other devices. Supports up to 256 strata, with lower devices getting time from higher devices and providing time to devices in a lower stratum. Can be configured to use a pool of time servers at pool. ntp. org. Uses stepping to quickly make large adjustments to close wide time discrepancies; usually about once every 60 seconds.
