Second half goals from Bangura and Bailey gave The Comrades the three points following costly errors from Rovers for both goals.
Rovers gave a good account of themselves at Berkhamsted on Saturday, and were well in the game for the majority of the match. Rovers' best chance of the first period came through Tre Charles, cutting in from the right his shot crashed against the post.
Berko's pressure in the second half increased, forcing Knox into a number of good saves.
The opener came 12 minutes into the second half, a sliced clearance from Cooper fell to the feet of the Berkhamsted midfielder, who squared to Bangura to slot into an empty net.
On the 70 minute mark, the hosts doubled their lead. Dallas winning a header from a drop kick, but it found the path of Bailey who lobbed the ball over Knox.
Rovers drop to 16th, Berko stay at the top.