The Network Time Protocol (NTP) is a critical service for keeping the clocks synchronized across machines on a network. Whether you're managing an airport's flight information system or an IT infrastructure, accurate timekeeping is essential. Here's a summary of key points regarding NTP:

1. Use Cases for NTP:

   • NTP is used to synchronize clocks on networked machines.
   • Examples include airports, where synchronized time is crucial for flight information, and IT environments, where services like Kerberos rely on consistent time.

2. Setting Up NTP:

   • You can set up NTP in two primary ways: using a local NTP server or connecting to a public NTP server.

3. Local NTP Server:

   

   • Install NTP server software on a dedicated server within your organization.
   • Install NTP client software on other machines in your network.
   • Configure client machines to sync their time with the local NTP server.
   • This approach offers full control over time synchronization within your network.

4. Public NTP Server:

   • Connect your client machines directly to public NTP servers managed by external organizations.
   • A convenient option for smaller setups or when you don't want to manage your own NTP server.
   • May be suitable for personal or small business use.

5. Hybrid Approach:

   • Combine both local and public NTP servers for large fleets.
   • Set up your NTP server to sync with a public NTP server, then have your client machines sync with your local NTP server.
   • Balances control and network efficiency.

6. Large Fleets:

   • For organizations with a large number of machines, running your own NTP server is better etiquette and offers more control over synchronization.

In summary, NTP is a fundamental network service that ensures accurate timekeeping across machines. Depending on your organization's size and needs, you can choose to set up a local NTP server, use public NTP servers, or employ a hybrid approach to maintain synchronized time across your network.