Question: what is the difference between ntp peer and ntp server command?
Answer: A group of NTP servers at the same Stratum level (Stratum 1 time servers, for example) are considered as NTP Peers to each other. NTP Servers at a higher Stratum level, on the other hand, are called NTP Servers (Note that Internet Time Servers should be configured as NTP Servers and not as NTP Peers).