Geth Trooper

Mass Effect
Geth Troopers are the "grunts" among the geth. These units are lightly equipped with no exotic weapons and are normally found in groups of two or more. To tell them apart from the rest of the geth they wear blackish armor with greenish armor details and a bright blue 'flashlight eye'. However, they lack heavy armor, resulting in a weakness to weapons fire, and their light weight means they are vulnerable to biotics or grenades.

Tactics
These enemies are the standard geth unit, possessing neither the firepower of the Juggernauts nor the mobility of the Hoppers, but are versatile foes nonetheless. They are encountered in a wide variety of combat arenas, so caution must be taken to account for the many differing settings where they may be fought. Tech Talents such as Overload or Sabotage to lower their shields or overheat thier weapons will make them vulnerable targets. Utilizing Armor Piercing Rounds will increase your damage against these foes.

Mass Effect 2
In Mass Effect 2, Geth Troopers are the most common type of geth encountered. They differ in color from previous encounters, being white instead of steel gray, thus bearing more resemblance to Geth Shock Troopers from the previous game.

Capabilities
Offensive

They are equipped with the standard Geth Pulse Rifle.

Defensive

They have the Geth Shield Boost ability, which can strengthen their shields or replenish them when depleted.

Tactics
Disruptor Ammo, Overload, Shield Penetration Upgrades and weapons which deal good shield damage already are the best methods of dealing with their shielding. Shockwave will also briefly stun enemies when it impacts their shields and inflict light shield damage based on it's impact force. Explosive Combat Drone can serve as a distraction as well. These units should be close to the bottom of the priority list when it comes to AI Hacking. At best they will be a short distraction. There are usually always targets more suitable to hacking around when encountering geth, since the Troopers are often supported by at least one heavier kind of geth unit.