Network Time

This guide shows how to use the network time protocol (NTP) and how to set the system clock manually on a network device.

Introduction

NTP uses the UDP port 123 for communication. NTP is used to synchronize the clocks of computer systems over a network. A system that uses NTP to synchronize its clock is called a NTP client. It is recommended to use the NTP server as its primary source of time. It will synchronize its clock with the server's time. Configuring a Cisco device as an NTP client is a simple and effective way to ensure that the device clock is accurate and synchronized with other devices on the network.

Description
NTP stands for Network Time Protocol, it is a protocol used to synchronize the clocks of computers on a network to a common time source
The main purpose of NTP is to provide accurate and reliable time synchronization for devices on a network, such as computers, routers, and switches
This is achieved by using a hierarchical system of time servers, where each device on the network is configured to synchronize with a trusted time source, such as a primary NTP server
This primary server, in turn, synchronizes with another, more accurate time source, such as an atomic clock, GPS, or radio time signal
NTP operates by exchanging time information between devices, and using algorithms to calculate the average time across multiple time sources - this allows for the correction of any time inaccuracies and the compensation for network delays
NTP is widely used on the internet and in many organizations to ensure that all devices on a network have the same, accurate time - this is important for various applications, including logging, event correlation, and security
NTP uses the UDP network port 123

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