Question: what are the different types of time servers?
Answer: NTP. The Network Time Protocol (NTP) is the most frequently used protocol for time synchronization in a network. ...  SNTP. Simple Network Time Protocol (SNTP) is a less complex implementation of the network time protocol. ...  PTP-IEEE-1588. ...  Legacy Network Time Synchronization Protocols. ...  GPS. ...  DCF77. ...  WWVB. ...  MSF.