GitHub - Lorenzo-Venturelli/Cisco-IOS-emulator: A prepackaged virtual machine which emulates a Cisco 7200 router within a Debian virtual machine. A project developed in collaboration with I.T.I. E. Fermi of Modena
Getting Going with Cisco Router Simulators - RouterFreak
Exploring terminal emulation
NetSimK.com - CCNA Network Simulator
CCNA Training » Free Router Simulator Softwares
CCNA Training » Free Router Simulator Softwares
Router Simulator Comparison
List of network simulators/emulators and network virtualization tools - NIL - Network Information Library
Networksims.com Home Page: The Best Cisco Simulator (Emulator) in the World with router, switch, PIX, and wireless simulation for CCNA, CCNP, CCSP, ONT, ISCW, BSCI, BCMSN, SND, SNPA, and much more
Use Cisco Cisco Simulator for Layer 3 Switch Configuration - Programmer Sought