CyberCertPrepNetwork FundamentalsCommon Protocols & PortsEASYFree question
Scenario
A network engineer is configuring a new Cisco router to use NTP. They want the router to synchronize with an internet NTP server (time.google.com) and also serve as an NTP server for internal devices.
What is the NTP stratum hierarchy and what stratum level will the router have after synchronizing with time.google.com (which is stratum 1)?
- A.The router will be stratum 0 (closest to the atomic clock) after synchronizing
- B.NTP stratum: Stratum 0 = GPS/atomic clocks (reference clock, not on the network); Stratum 1 = NTP servers directly connected to stratum-0 devices (e.g., Google's time.google.com, NIST's time.nist.gov); Stratum 2 = servers synchronized from stratum 1 (the router after syncing from stratum 1 becomes stratum 2); Stratum 3+ = devices synchronized from stratum 2+; stratum 16 = unsynchronized. The router would be stratum 2 and would provide stratum 2 time service to internal NTP clients
- C.The router will be stratum 1 because it directly contacts a GPS server