connection of a graphic card

i have a quadro 2000
i´m a newbie with this informatic issues
i have an stupid question i guess
referring to the connections screen-cpu, how does it work?

when i plug my dvi cable from the cpu to the screen, i have to plug also an hdmi cable from the computer?

2 cables (one is the hdmi and the other is the dp conection of the graphic card, conected to the dvi adapter and connected to the screen), or just 1 cable (dp conection from the graphic card to the dp-dvi adapter -to the screen?

im kind of lost with this stupid thing here

thx guys! :)