hello members. I m new to this site. I want to do CEH but i want to know that is it neccessary to do CCNA,MCIPT and RHCE before going for CEH? As I dont have networking knowledge. Please help me for this.

I'm super late on this but incase you're still watching:

If you have absolutely zero knowledge in networking you could start out with some free videos from Professor Messer:

http://www.professormesser.com/free-network-plus-training/professor-messers-free-comptia-network-certification-training-course/

These videos cover the Network+ exam and will provide you with fundemental information about networking in regards to stanardsa and basic equipment.

After that I would suggest reading the following:

http://www.amazon.com/CCNA-Certified-Network-Associate-640-802/dp/0470110082
http://www.amazon.com/Network-Warrior-Gary-Donahue/dp/1449387861/ref=pd_sim_b10

These books will scratch the surface (relative to CCNP level knowledge) of such as routing protocols and subnetting Cisco's way. This knowledge will not only help you with your CEH studies but its also applicable to several types of jobs in the industry.