| Image | Source | Use Case | |-------|--------|----------| | | VIRL / CML | Similar but newer. | | IOS-XE on CSR1000v | Cisco DevNet / CML | Full-featured but heavier. | | vIOS-L2 | VIRL | For switching labs. | | OpenSource: FRRouting | FRR Project | Linux-based routing suite. | | Dynagen/Dynamips | GNS3 (old) | Emulates physical routers – slower. |
If you are a serious network professional, invest in a Cisco Modeling Labs (CML) subscription or seek legitimate access through work or training programs. Not only will you get a clean version of this exact image, but you also receive updates, support, and peace of mind. | Image | Source | Use Case |