Stepping on or over the line on a serve.
Failure to serve the ball over the net successfully.
Hitting the ball illegally (Carrying, Palming, Throwing, etc.).
Touches the net with any part of the body while the ball is in play.
If the ball is driven into the net with such force that it causes the net to contact an opposing player, no foul will be called, and the ball shall continue to be in play.