Most linemen will rush a pass play, but whether they do or don't depends on the play called. A zone blitz could have the the nose guard drop into coverage. This is the exception, and not the rule.
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The first responsibility is to be able to take up as many blockers as you can to allow other players in the defense to have more favorable match ups. The other responsibility is to be able to play the run. If a nose guard commits to far up field, it can leave a hole in the defense and can give a running back a crease to run to daylight.
Their function is to rush the passer (if they can get past the offensive linemen blocking them), and stop running plays directed at the middle of the line of scrimmage. A defensive tackle that lines up directly across from the ball (and therefore, is almost nose-to-nose with the offense's center) is often called a nose tackle or nose guard . The nose tackle is most common in the 3-4 defense and the quarter defense. Most defensive sets have from one to two defensive tackles. Sometimes, but not often, a team will employe three defensive tackles, it mainly depends on the coaching staff's gameplan.
Depends on whether you play a 3-4 (three defensive linemen / 4 linebackers) or a 4-3 (4 DL, 3LBs). In a 3-4, generally a Nose guard aligns on or near the offensive center in one of four techniques - head up on the center (a "zero" technique); just slightly left or right of dead center (a "shade" technique); in the gap between the center and guard (a "1" technique); or, on rare occasions, inside shade of the Offensive Guard (a "2" or "2i" technique).
The Nose Guard's responsibilities depend on the system he plays in. He is almost always going to be an important player against the run, particularly vs. any runs inside the Tackles (in the A or B gap). In certain systems he may be asked to penetrate into the backfield and rush the passer, while other defensive systems require the NG to stay on the line of scrimmage and move laterally no deeper than one yard in the backfield. This approach may lose something in the pass rush, but it is more effective against teams that run draws, traps, and screens.
Take on the center, and one or two guards off of the linebacker or another defensive tackle, all while controlling the 1-0-1 gaps in the interior offensive line.
Basically Create Chaos in the middle and do not let anything get through.
A Nose guard or nose tackle is a defensive lineman who lines up between the defensive ends and over the center of the offensive line.