eve-NG is still the easiest to use IMHO, me and many of my coworkers used it to prepare for our CCNA/CCNP/CCIE certifications. I would swap it in an instant fo

eve-NG is still the easiest to use IMHO, me and many of my coworkers used it to prepare for our CCNA/CCNP/CCIE certifications. I would swap it in an instant for an equally user-friendly open-source one though, if there was anything comparable, as some of the features lacking in eve-NG Community were really annoying to deal with (e.g. no connection to a real, physical network and/or the internet)