The game started well, but Swindon soon fell behind after 27 minutes with a goal from Joe Anyinsah who scored from 10 yards out.
It was a poor first half with Swindon having few chances in front of goal, and going into the half time break 1-0 down.
Anyinsah scored again for Carlisle on 53 minutes, and then Ben Tozer was sent off for Swindon for push on the edge of the box. The resulting free kick was cleared away.
Swindon have a small number of shots on target, but by 75 minutes it was 3-0 with a goal from Joe Garner.
Overall a poor display from Swindon, but the score line was a bit much as there wasn't that big a gap between either side, just Carlisle took their few chances well.