indefinite article, le different entre des et les

The sentence you are asked to translate is:

He asks questions all the time -- Il pose des qestions tout le temps.

The article des plays the role of the indefinite article in this sentence. The definite article would be les:

Il pose les questions tout le temps. -- He asks the questions all the time.

You might want to review the corresponding lesson: https://progress.lawlessfrench.com/revision/glossary/article-type/indefinite-article