- Linux/UNIX
- Networking
- Virtualization
- VoIP Protocols and SIP RFCs, FreePBX, Asterisk, Kamailio
- ED-137 and ED-138 Interoperability Standards for VoIP Air Traffic Control
- Cisco, Nokia equipment configuration
- Linux and Network Security
- Routing Protocols, MPLS, IPv4/IPv6 subnetting
