Vostro 3471, what type of SSD is supported?

SSD M.2 gum stick

or SDD SATA, 2.5"

be clear what you want or simply say where you are plugging it in.

or to USB port, via external encloser

or to esata port same way.

lots of ways to use any SDD of many kinds, but what do you want exactly

must it boot or be just  a 2nd drive.???

Standard 2.5 inch sata drives work fine.