Antivirus, Communications Servers, Cryptography, DHCP (Dynamic Host Configuration Protocol), DNS (Domain Name System), Data Recovery, Disaster Recovery, Firewalls, Hardware Virtualization, Identify Issues, Linux Operating System, Load Balancing, Microsoft Windows Server, Performance Analysis, Performance Metrics, Scripting (Scripting Languages), Server Maintenance, Systems Administration/Management, Systems Analysis, TCP/IP (Transmission Control Protocol/Internet Protocol), Unix Operating Systems, VPN (Virtual Private Network)