The following figure shows the evolution of NTP. Mills - a professor at the University of Delaware, and evolved from the Time Protocol and the ICMP Timestamp message. NTP is one of the earliest standards for clock synchronization on a network. The precision of NTP can reach 1 ms on a LAN and tens of milliseconds on a WAN. NTP is a protocol used to synchronize the clocks of hosts on a network to the UTC time. In conclusion, a unified standard time is of great significance to the network. The clock servers and clients IP addresses uniquely identify a 1588 ATR connection, which is set up by exchanging Layer 3 unicast packets between a client. System time: Some applications or services require accurate time to mark user login and transaction information to ensure event traceability.Collaborative processing: When several systems work together to process the same complex event, they must use the same clock for reference to ensure correct sequencing of operations.If these requirements are not met, inaccurate billing will occur and result in doubts and complaints of users. Billing system: Billing services must know the time accurately and require consistent time on all devices.If the system time of different devices is inconsistent, accurately correlating log files between these devices is difficult, or even impossible. Network management: Analysis on logs collected from different network devices must be performed based on time.Accurate time is critical to the network for many reasons, for example:
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