Plz, can any one tell me
If there is any program that I can desgin a network with Routers and switches, and make simulation on it to test and see the result
Yes, as shahem said, GNS is very helpful as a practice or beginner. If you want to learn more better go to a lab with a real equipment. Because sometimes the output of the GNS might not like real environment, and it does not support have layer 3 switch function when I used it back to months ago.
hope it helps
Here is the link to the very best simulation program which is free....
download and run this application. But you will need Cisco IOS for each platform. If you have CCO account with H/W and Software maintenance, then download and copy into relevant directory.
There are loads of technotes and video tutorials you can access from the same site as well as loads of tutorials on Youtube.com
Hope this helps....