Answers:
Yea. Will not work for cable or dial up.
ADSL modem are actual modems.
MODEM- MO(dulate) DEM(odulate)
Make an analog signal to digital for your computer and from your computer a digital to an analog.
Cable modem aren't really modems they are in actuality routers but the society is still thinking analog.
Ofcourse it will.
YOu can goto the modem/router configuration page, which is usually,
http://192.168.1.2/ from your modem and type in admin as user and go past and set its settings too. toggle between 2+ & norm.