What is a common method for ensuring internal NTP server synchronization?

Synchronizing to a public NTP server is a common method for ensuring internal NTP server synchronization. Utilizing public NTP servers provides a reliable external time source that can help maintain accurate time across a network. Time synchronization is crucial for various security protocols and applications, such as Kerberos authentication and logging, where consistent timestamps are required.

By regularly polling a public NTP server, internal systems can correct any drift in their local clocks, ensuring that they maintain accurate time relative to an agreed-upon standard. This practice helps to avert issues related to time discrepancies that can affect system operations and security protocols.

While there are other options that mention using a local clock or varied time sources, they may not provide the same level of reliability as a synchronized public NTP server, especially in larger environments where precision timekeeping is critical.