Cook pasta in boiling water per package directions, or use leftover pasta.
Cut the steak in half lengthwise and then crosswise into 1-inch strips.
Heat a large nonstick skillet over medium-high heat.
Pour the oil into the skillet and swirl to coat the bottom.
Add garlic and half the steak and cook for 1 to 1 minutes, or until the surface is no longer pink, stirring constantly.
Using a slotted spoon, transfer to a plate.
Repeat with the remaining beef.
Cover lightly with aluminum foil to keep warm.
Put the zucchini and yellow squash in the same skillet.
Cook for 2 to 3 minutes, or until crisp-tender, stirring constantly.
Return the steak to the skillet.
Stir in the tomatoes and dressing.
Cook until heated through.
To serve, spoon 1/2 cup pasta onto plates.
Place the steak mixture on the pasta.
Sprinkle with 1 tbs Parmesan.