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Network Time Protocol (NTP)
This article explains how Network Time Protocol (NTP) is implemented on UChicago networks.
The Network Time Protocol NTP is used to synchronize the time of a computer client or server to another server or reference time source, such as a radio or satellite receiver or modem. The existing NTP subnet consists of a multiply redundant hierarchy of servers and clients, with each level in the hierarchy identified by stratum number. Primary servers operate at stratum one and provide synchronization to secondary servers operating at stratum two and so on to higher strata.
There are three stratum three NTP servers on campus:
Each server listens on User Datagram Protocol (UDP) on port number 123, as per RFC 5905.