Disable this service. Talk and ntalk allow users on other systems to carry on conversations with local users. This service should be disabled. Tftp is a file transfer service that does not require passwords. This service should be turned off and wrapped.
Time provides synchronization of system clocks.
The xntp service is a better choice. This list should give you a starting point for determining which services to shut down, and might help guide your thinking with respect to others. Once network services are pared down to those you need to support, you can examine other tools and techniques for securing those without which you cannot manage. Click to Download. Harness the power of your network.