- Routing & Switching: OSPF/EIGRP/BGP/MPLS/FHRP/STP/VTP/FabricPath/VXLAN
- Cisco IOS, IOS XE, NX-OS
- F5 BIG-IP (LTM, APM), Cisco ACE module
- DNS
- Cisco ASA, Juniper ISG, SRX, CheckPoint, ISE
- Nagios, Cacti, QRadar
- Wireshark, NMAP, hping
- VMware ESXi 4/5
- CCIE RS, CCVP, OCP