Practice Labs, Simulators, Emulators

Cisco Packet Tracer

If you’re unable to install or run Cisco Packet Tracer on MacOS, try using Boot Camp to run Windows 10, and install the Windows version of Packet Tracer in Windows 10.

How to access rommon in Cisco Packet Tracer, as Ctrl+Break does not work.

          1. enable
          2. config terminal
          3. config-register 2100
          4. end
          5. reload

How to upgrade the IOS on a switch or router in Packet Tracer


  • GNS3 is a graphical network simulator that allows simulation of complex networks.
  • Dynamips, the core program used with GNS3 that allows Cisco IOS emulation.


Boson NetSim

Practice Network Labs and Tutorials

  • Networking blog by Jeremy Stretch
  • Cheat Sheets for network protocols, applications, etc.

Cisco IOS Tutorials