Oracle Data Guard - redo logs not in chronological order?
I simply do not believe. It's impossible. There is process called FAL (Fetch Archive Log), it can happen that redo-logs are not TRANSFERRED in chronological order, but anyway they must be APPLIED in chronological order.

Also logical standby has can have some gotchas but those are not related to network link.
(For example for some reason LOCK TABLE statement is not propagated to slave)