Some certification exams (like CCNA and CCNP) include hands-on lab simlets where you must type commands or drag routers. Boson ExSim tests replicate this environment. You might be presented with a topology, need to SSH into a router ( show running-config ), identify a misconfiguration, and answer questions based on your findings.
If your query was regarding (simulating bosons on exascale supercomputers), the context changes entirely. boson exsim tests