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  3. 测量远程服务器的系统时钟（时间）
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测量远程服务器的系统时钟（时间）

什么是可用于测量远程服务器的系统时钟（时间）的networking协议？ 到目前为止我有：

  • 使用NTP查询
  • TCP时间戳
  • HTTP标头

还有其他的吗？

总是有白天协议

从RFC ： 

A useful debugging and measurement tool is a daytime service. A daytime service simply sends a the current date and time as a character string without regard to the input. TCP Based Daytime Service One daytime service is defined as a connection based application on TCP. A server listens for TCP connections on TCP port 13. Once a connection is established the current date and time is sent out the connection as a ascii character string (and any data received is thrown away). The service closes the connection after sending the quote. UDP Based Daytime Service Another daytime service service is defined as a datagram based application on UDP. A server listens for UDP datagrams on UDP port 13. When a datagram is received, an answering datagram is sent containing the current date and time as a ASCII character string (the data in the received datagram is ignored).