I will say that CCNA (taken in 2019) was the most legitimate of these exams. There were a handful of "simulator" questions that involved actually typing some commands into a Cisco IOS switch or router to change the configuration as appropriate. So that required a deeper understanding and forced test-takers to demonstrate what they might need to do on the job as a network technician. However, CCNA also seemed to be one of the exams for which it was easiest to find a "dump" including "practice simulators" taken straight from the real exam.