Exam N10-008 topic 1 question 279 discussion

NTP (Network Time Protocol) servers are organized into a hierarchy known as strata. Stratum 1 servers are the most accurate and are typically connected directly to a highly accurate reference time source, such as an atomic clock. Stratum 2 servers are connected to stratum 1 servers and are slightly less accurate than stratum 1 servers. Stratum 3 servers are connected to stratum 2 servers and are slightly less accurate than stratum 2 servers, and so on. In order to use the most accurate NTP reference available, the administrator should configure the server to use a stratum 1 NTP server. B. Stratum 2 servers are less accurate than stratum 1 servers. C. Stratum 3 servers are less accurate than stratum 2 servers. D. Stratum 4 servers are less accurate than stratum 3 servers.

The Stratum scale is from 0-15. The lower the Stratum Number the more accurate the time given

Stratum 1 NTP servers are directly connected to an accurate clock source

A. Stratum 1.

As you progress through different strata there are network delays involved that reduce the accuracy of the NTP server in relation to UTC. Timestamps generated by an EndRun Stratum 1 Time Server will typically have 10 microseconds accuracy to UTC. A stratum-2 server will have anywhere from 1/2 to 100 ms accuracy to UTC and each subsequent stratum layer (stratum-3, etc.) will add an additional 1/2-100 ms of inaccuracy. Reference: https://endruntechnologies.com/products/ntp-time-servers/stratum1