When a node connects to a network, does it sync pre-existing the kv pairs from other nodes or does it start with nothing and wait for new entries to be added to the database?

[distbit0]

When a node connects to a network, does it sync pre-existing the kv pairs from other nodes or does it start with nothing and wait for new entries to be added to the database?

If it does not auto-sync current entries, is there a way to implement this on top or as an addition to this library?