Cisco NTP basics

NTP is a protocol designed to synchronize clock with a atomic- or a radio clock.
The NTP Protocol uses the current standard of protocol version 4.
NTP is reserved for the UDP-Port 123.
The timestamp at NTP are 64bit long. 32 bits encode the seconds since the beginning of 1. Januar 1900 00:00:00. The next 32 bits are the fraction of the seconds.
With this manner it is possible to calculate the time in a resolution of 2 ^-32 seconds.

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