Networking: Cisco, Juniper, MikroTik, Ubiquiti, TP-Link, Aruba, Fortinet
Firewalls & Security: Sophos, FortiGate, SonicWall, Palo Alto
Wireless: Aruba, Ruckus, Cisco Meraki, Ubiquiti UniFi
Network Monitoring: PRTG, Zabbix, SolarWinds, Nagios
Virtualization & Cloud: VMware NSX, Azure Virtual Network, AWS VPC
Protocols: TCP/IP, DHCP, DNS, OSPF, BGP, STP, NAT, QoS