OS: Windows server 2012/2016/2019/2022 Ubuntu 16.04/18.04/20.04/22.04, CentOS 7/8/Steam, Debian (only in proxmox virtualisation)

Windows: AD, DNS, DHCP, GPO, WDS, FTP, IIS,

LINUX/UBUNTU/CENTOS: OpenVPN, DHCP, nginx(as reverse proxy), zabbix, ministra, asterisk+freepbx,

Virtualization: WmWare, KVM(basic knowledge), VirtualBox(home laboratory), Proxmox(only when WmWare stops support some hardware in machine)

WmWare: ESXI, vCenter, vSphere(basic), Horizon(basic)

Network hardware: Cisco, Ubiquiti, Mikrotik

Cisco: Routin and switching(without sertificate) ISE, WLC, CME, CUCM, ACL, Security (FTD, FTD+FMC, Anyconnect) etc.

Ubiquiti: Controller, AP

Mikrotik: capsman, EoIP, IKEv2, L2TP

Network knowledge: TCP/IP, DNS, DHCP, IPIP, OSPF, BGP, GRE, MPGRE, VLAN, NAT, EIGRP, Static and Dynamic routing, VTP, EtherChanel
VPN: FlexConnect VPN, DMVPN, OpenVPN
Backup: Veeam Backup & Replication