Exam 350-701 topic 1 question 486 discussion

C. The stratum level of a NTP server represents its level of precision and accuracy, a stratum level of 16 indicates that the server is unsynchronized and cannot be used as a time source. This means that the configured NTP server is not working and cannot provide correct time to the ASA. The engineer should check the NTP server configuration and availability, also it's important to check if the NTP server is reachable and configured to use the correct IP address.

ONNLY RANGE FORM 0-15 , 15 is meaning not usable time server. the higher number means worse. The NTP Stratum Model The NTP Stratum model is a representation of the hierarchy of time servers in an NTP network, where the Stratum level (0-15) indicates the device's distance to the reference clock. Stratum 0 means a device is directly connected to e.g., a GPS antenna. Stratum 0 devices cannot distribute time over a network directly, though, hence they must be linked to a Stratum 1 time server that will distribute time to Stratum 2 servers or clients, and so on. The higher the Stratum number, the more the timing accuracy and stability degrades. The NTP protocol does not allow clients to accept time from a Stratum 15 device, hence Stratum 15 is the lowest NTP Stratum. A group of NTP servers at the same Stratum level (Stratum 2, for example) are considered NTP Peers to each other. NTP Servers at a higher Stratum level, on the other hand, are referred to as NTP Servers.