what is data communication and networking. main learn karna chata hoon.tu mujahay batao kay main first kiya learn karoon meri basic nahi hai data communication main networking ko learn kanay kiya liya kaya kaya things darkaar hain aur aagr koi software hai or book hai yah es kay saath koi ptactise. yar mujay complete information ki needs hai plz give me. and helping material.