What is the difference between an over and under front?

The key to knowing the difference between the “Over” and “Under” front in the 4-3 defense is the alignment of the “3-technique” defensive tackle and the Nose. The open-side end plays the “C-gap” with the “3-technique” defensive tackle in the “B-gap” and the Will ‘backer filling the “A-gap.”Mar 21, 2014