While learning Cisco Technology we need a hand-on configuration training and now a days we are lucky that there are numerous software available to help us.

These are the following

  1. Dynamips 
    • Cisco Emulator which load a real IOS
    • Front-End
      • GNS3 – Graphical frond-end
      • Dynagen – Text-based front-end
  2. IOU/IOL – IOS on Unix
    • Cisco proprietary software for internal use only (Don’t ask me for a copy)
    • Front-End
      • iou-web
      • bash script
  3. vIOS – Virtual IOS (VM) – OnePK
    • Cisco proprietary software part of the CML
    • Front-End
      • GNS3 via Qemu
      • Hypervisor (VMware)
      • CML (ViRL)

 GNS3 Screenshot

GNS3

iou-web

iou-web-new

Cisco Emulator/Simulator
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