The Network Time Protocol (NTP) provides the mechanisms to synchronize
time and coordinate time distribution in a large, diverse internet
operating at rates from mundane to lightwave. It uses a returnable-time
design in which a distributed subnet of time servers operating in a
self- organizing, hierarchical-master-slave configuration synchronizes
local clocks within the subnet and to national time standards via wire
or radio. The servers can also redistribute reference time via local
routing algorithms and time daemons.