even i want to study networking , kindly suggest some good router simulators (free download) , wesites and books
Try Packet Tracer 5.2 and GNS3 simulator softwares.
Use this website for reference for all kinds of topics on networking.
Get yourself a good starter networking book. e.g. Computer Networks (Andres S Tanenbaum - Pearson Education Publications)
Computer Networking (James F. Kurose & Keith W. Ross - Pearson Publication).
Once you are comfortable with networking technologies, and the jargons, the concepts, then you can move into more industry standard stuff i.e. Cisco. Again this website will be a very good one stop shop for information. As always if you can get hands on some Cisco publications then more the merrier.
If you think this is what you want to do i.e. networking then start going in for some acredition i.e. CCNA etc etc etc. But first, make sure you have a solid foundation. Nothings worse than a flaky ground on networking.
Avoid brain dumps and short-cut methods to learn networking, like a plague. They don't help you. They only confuse you and give you a false sense of belief that you know networking.
Picking pebbles on the shore of the networking ocean