The protocol is usually described in terms of a client–server model, but can as easily be used in peer-to-peer relationships where both peers consider the other to be a potential time source.

Asymmetric routes and network congestion can cause errors of 100 ms or more. NTP can usually maintain time to within tens of milliseconds over the public Internet, and can achieve better than one millisecond accuracy in local area networks under ideal conditions. : 3 It uses the intersection algorithm, a modified version of Marzullo's algorithm, to select accurate time servers and is designed to mitigate the effects of variable network latency. NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC). In operation since before 1985, NTP is one of the oldest Internet protocols in current use. The Network Time Protocol ( NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable- latency data networks.

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