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Windows Servers: Windows Server 2016, Windows Server 2019Unix Servers: Ubuntu, CentOS, Red Hat Enterprise LinuxSQL Databases: MySQL, MSSQL, MariaDB, PostgreSQL, Oracle, SQLiteNetworking: Routing, Access ListsFirewalls: Cisco, Checkpoint, Fortinet, Juniper, OPnsense, pfsenseVirtualization: ESXi, Proxmox, Docker ContainerizationMonitoring Tools: Zabbix, Elastic SearchWeb Servers: Apache, NginxMail Servers: Exchange, PostfixVPN Tunneling Servers: OpenVPN, WireGuard