Network Penetration Testing is a correct guess. Pentesting itself can be quite a broad field, and although you’re right about a lot of it being network-related

Network Penetration Testing is a correct guess. Pentesting itself can be quite a broad field, and although you’re right about a lot of it being network-related, it typically gets split into categories depending on the exact type of pentest (e.g. application penetration testing, wireless pentesting, embedded devices, SCADA/OT systems). You could get into a debate on which areas are more demanding, but as you get deeper, they do require different skill sets/specialities/ways of thinking. Someone who’s great at web app pentesting may not necessarily be fantastic at RE or social engineering.