Secondary time servers obtain the time from a Single Reference, Primary, or Reference time server. They adjust their internal clocks to synchronize with the network time, and they provide the time to client workstations.
A Secondary time server doesn't participate in determining the correct network time.
Secondary time servers should be close in proximity to Primary or Reference time servers.
For optimal time synchronization, minimize the number of intervening routers and slow LAN segments between Secondary time servers and their Single Reference, Primary, or Reference time server.