CCNA test that i remember it

I go through the ccna test but i fail , and some questions from the test i dont know it . can u please answer ir .

wat is the name of the cable that connect the console port in router to the serial port in pc ?

– with full duplex u can connect : host/host , sitch/switch , hub/hub , hub/switch , sewich/host , swich/router , router/hub and so on ……

– wen u connect hub to switch wat is the method that the connection will be ( straight , cross )?

– if u have a ip network number( not subnet number ) how u will know the host ip number ?

Thanks