Every fingering that fits a hand
2200
moderate · barre
220x
moderate · barre
2405
easy
2205
moderate · barre
2455
moderate
What is true of it
Asus4 is A, D and E — 1, 4 and 5 counted from A.
These are also the notes of Dsus2/A. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
The easiest of the 5 fingerings below is 2200: one finger, one of them barring the 2nd fret, held at the 2nd fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
3 of the 5 need a barre.
Where its notes are on the neck
The brass dots are A, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
Asus4/D
x200
Asus4/E
x455
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.