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How accurate is network time protocol?
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.
Why would it be important to set the clock on a network device?
The importance of time synchronization Time, more importantly, accurate time shared by all devices, is vital for network communications to be successful. When events happen, the order in which they happen, and how that data is then collected and logged depends almost entirely on devices being in synchronization.
How is the reliability of a network clock determined?
In ITU-Recommendation G.811 (Timing Characteristics of Primary Reference Clocks) a network clock stability of 1 x 10 E-11 for the Primary Reference Clock (RPC) is recommended. This accuracy is derived from 1 acceptable slip in a 2 MBit/s transmission in an observation time of 70 days. This clock stability can be generated by atomic clocks only!
How are clocks set on a network device?
And it’s incredibly time consuming to log into all of those devices and manually set the clocks. The second way is to use an automatic time synchronization protocol. There are two in common use. The one we normally use is Network Time Protocol (NTP). It’s a mature protocol that’s been around for decades and is currently in its fourth version.
Which is the best protocol for synchronizing clocks?
This protocol is able to synchronize clocks to sub-microsecond accuracy. It is, however, more complicated to deploy and not universally available on network equipment. For most applications, NTP is sufficient. People tend to use PTP for applications where a microsecond is a long time.
What do you need to know about Network Time protocols?
Network Time Protocols (NTP) are a hierarchical protocol and is divided into stratum which define the distance from the reference clock. A reference clock source that relays UTC (Coordinated Universal Time) and has little or no delay is known as a stratum-0 device.