GNS3 – An Open Source tool to learn and discover more about networking and prepare for certificate exams as well

https://www.gns3.com/

https://docs.gns3.com/1FFbs5hOBbx8O855KxLetlCwlbymTN8L1zXXQzCqfmy4/index.html

https://learningnetworkstore.cisco.com/cisco-virtual-internet-routing-lab/personal-edition-virl-pe-20-nodes-virl-20