My working experience more than 8 years. My experience are given bellow
1. VMware Esxi,
2. Windows Server (Active Directory GPO, DNS, DHCP, DFS, NFS, AAA, Clusters, High availability, Hypervisors (Hypper-V)
3. Firewalls (Sophos, Pfsense, Mikrotik, Squid, Csico FTD),
4. Networking (Wired Network (Routers, switches, VPN, Routing Protocols (RIP, EIGRP, OSPF, and BGP)
5. Wireless (Meraki, Cisco WLC)