GNS3—Graphical Network Simulator 3.
With the help of this tool you can design and simulate really complex and advanced Cisco networks. It is an outstanding resource for those people, Who are advancing towards their CCNA, CCNP, CCIE, and CCIP certifications.
GNS3 is a FREE and open source Network and Router emulator that can load almost any Cisco device IOS to it, and it has the most complete command set of Cisco devices. It gives you actual feel of a router.
* Design of high quality and complex network topologies.
* Emulation of many Cisco router platforms and PIX firewalls.
* Simulation of simple Ethernet, ATM and Frame Relay switches.
* Connection of the simulated network to the real world!
* Packet capture using Wireshark.
GNS3 Setup(GNS3 v0.7.4 all-in-one (includes Dynamips 0.2.8-RC3, Qemu/Pemu, Putty and WinPCAP 4.1.2))
Cisco IOS Images(AIO)
c3640-ik9o3s-mz.124-18 (supports most of the switching commands)
Use Google search for Cisco IOS Images, Type the following in search box "index of ios parent directory bin" (without quotes)
Cisco PIX Image with serial key
GNS3 Video tutorials (GNS3 installation, Running PIX, Installation and Configuration of SDM etc)
You can install and run Cisco SDM along with it.
Brief Tutorial on SDM can be found here.
Short Tutorial on How To Add Virtual Pc To Your Gns3 Topology
Also you can get help about GNS3 & Dynamips (the engine) here :
http://7200emu.hacki.at/ (It is a complete source about GNS3 & related topics).
Gns3 Video Tutorials can also be found here:
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