Kill Confirmed is similar to TDM, but kills only count towards the game objective if you "confirm" the kill. You can "confirm" the kill by being the first to walk over the body of the person whom you killed and collecting their "kill data", a symbol in the team color. You can also "confirm" any kills made by your teammates and "deny" any kills made by the enemy team. At the end of the round, the team that has confirmed the most kills wins the match.
Sniping from afar wont be as effective a strategy in Kill Confirmed as in other game modes. This is because you have to walk over the bodies of enemies. It can work however if you have a team who is close to enemies and is actively walking over their bodies. When this happens, you will get the normal amount of points, and the person who confirmed the kill will get a kill confirm assist.