Topic: How does subsidized student loan interest work?

I will be taking out a subsidized loan for the first time, and have a question about the interest. If I take out $2,000 at 5% interest and it is deferred until after graduation. If I pay off the loan before it is due, do I have to pay the interest for all the years I have been borrowing the money or just the principle?
Can anyone please explain to me how the interest of the sub loan work? Thank you.

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