Data center management & troubleshooting, Preventing and Defending Against Cyber Attacks, Server installation and troubleshooting, routing, switching, Windows servers, Ring (MPLS, RSTP, MSTP), Firewall, Mikrotik RouterOS, Linux servers, DNS server, VOIP servers, Live streaming servers (HLS, RTMP, Multicast, DESH), Wireless, VPN, AAA troubleshooting, GPON (Huawei, Linkstar, UTStar, Conwex, Alphion), EPON(Syrotech, KingType, BDCOM) , Advance networking tools, IIS, PHP, Mail servers, Virtualization (VMware, Virtual Box), Distribution network planning & Installation, Database, Web Servers (Apache, nginx, IIS), Network Monitor (Nagios, Manage Engine), NAS(Raid Troubleshooting).