It is support all Nikkor lenses BUT

like other new entry-level Nikon DSLR , Nikon D3100 only support autofocus with AF-S and AF-I CPU lenses only. AF-S , short of AutoFocus Silent is using silent wave technology to focus quickly and quietly. Its similar to Canon’s USM technology. AF-I or Autofocus Internal is driven by a coreless DC motor when at 1996 replaced by AF-S technology. Nikon D3100 still can use older AF lenses but you have to manual focusing before shooting an object. AF lenses is still in the market although the production maybe limited . People are still looking for them ? why ? because sometimes it is much cheaper but quality remain same or better.

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