Network Time Protocol - ορισμός. Τι είναι το Network Time Protocol
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Τι (ποιος) είναι Network Time Protocol - ορισμός

STANDARD PROTOCOL FOR SYNCHRONIZING TIME ACROSS DEVICES
Network time protocol; Simple Network Time Protocol; SNTP; NTP server; Port 123; RFC 1305; Ntp4; NTP clock strata; NTP clock stratum; Stratum 0; Stratum 1; Stratum 2; Stratum 3; Digital Time Synchronization Service; Network Time Security; NTP (protocol)
  • chronyc}}, showing sources and activity information. [[Terminal window]] under [[Arch Linux]]
  • NTP was designed by [[David L. Mills]].
  • Round-trip delay time δ
  • Yellow arrows indicate a direct connection; red arrows indicate a network connection.
  • The NTP management protocol utility ntpq being used to query the state of a stratum 2 server.
  • Schriever AFB (Colorado)]] is a stratum 0 source for NTP

Network Time Protocol         
(NTP) A protocol built on top of TCP/IP that assures accurate local timekeeping with reference to radio, atomic or other clocks located on the Internet. This protocol is capable of synchronizing distributed clocks within milliseconds over long time periods. It is defined in STD 12, RFC 1119.
SNTP         
Simple Network Time Protocol (Reference: RFC 2030)
Time Protocol         
PRIMITIVE INTERNET CLOCK TIME PROTOCOL
Timep; TIME protocol
The Time Protocol is a network protocol in the Internet Protocol Suite defined in 1983 in RFC 868 by Jon Postel and K. Harrenstein.

Βικιπαίδεια

Network Time Protocol

The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use. NTP was designed by David L. Mills of the University of Delaware.

NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC).: 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 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. Asymmetric routes and network congestion can cause errors of 100 ms or more.

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.: 20  Implementations send and receive timestamps using the User Datagram Protocol (UDP) on port number 123.: 16  They can also use broadcasting or multicasting, where clients passively listen to time updates after an initial round-trip calibrating exchange. NTP supplies a warning of any impending leap second adjustment, but no information about local time zones or daylight saving time is transmitted.

The current protocol is version 4 (NTPv4), which is backward compatible with version 3.