R1 will be our NTP client and R2 will be the NTP server. We’ll take a look at these different issues. NTP server source filter: NTP servers can be configured to allow only clients from certain IP addresses.A stratum level of 16 is considered unusable. Stratum level too high: The stratum level is between 1 (best) and 15 (worst).Time offset too high: When the time offset between client/server is too large it will take a very long time to synchronize.NTP Authentication issues: NTP supports authentication, client and server need to use the same settings.NTP traffic filtered: access-lists could block NTP traffic.There are a couple of things that could go wrong with NTP: NTP is an important protocol to use since it ensures our logging information has the correct time and date. In this lesson we’ll take a look at troubleshooting NTP (Network Time Protocol).
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