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NTP - Network Time Protocol

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The document provides an overview of the Network Time Protocol (NTP), detailing its historical development, technical specifications, design aims, hierarchical structure, synchronization methods, and operational mechanisms. NTP, developed in 1985 by David Mills, is designed for accurate time synchronization over the Internet using multiple time servers. It contrasts with other synchronization methods like Cristian's method and the Berkley algorithm by supporting a decentralized approach. The document also discusses the accuracy of NTP, its modes of operation (multicast, procedure-call, symmetric), and how it calculates time offsets to ensure reliable synchronization.

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Is Windows NTP TCP or UDP?

UTC is supposed to be the same no matter where you are, so its kept by a limited number of trusted atomic clocks at various locations worldwide. The NTP standard lets you sync your local system to these accurate timing sources as well as other time servers.

What is NTP protocol and how it works?

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.

Is NTP TCP or UDP 123?

Service Name and Transport Protocol Port Number Registry Service NamePort NumberTransport Protocol ntp 123 udp nnsp 433 tcp nnsp 433 udp nntps 563 tcp21 more rows Jan 23, 2025

What is the NTP protocol in computer networks?

Neighbor Discovery (ND) is a set of ICMPv6 messages and processes that determine the relationship by sending network information to the neighbor MAG before handover that can help to eliminate the need for MAG to obtain the MH profile from the policy store/AAA server whenever a MH accomplishes handover between two APs

What is the difference between NTP 3 and NTP 4?

NTPv4 improves on NTPv3 and corrects certain bugs. NTP timestamp definitions have been expanded to encourage the use of the floating double data type. This results in a time resolution better than one nanosecond, and the frequency resolution is less than one nanosecond per second.

What is the NTP protocol?

Network Time Protocol (NTP) is an internet protocol used to synchronize with computer clock time sources in a network. It belongs to and is one of the oldest parts of the TCP/IP suite.

Is NTP a TCP or UDP protocol?

The Windows Time service follows the Network Time Protocol (NTP) specification, which requires the use of UDP port 123 for all time synchronization. Whenever the computer synchronizes its clock or provides time to another computer, it happens over UDP port 123.

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