802.1, 802.2, BGP, DNS (Domain Name System), DWDM (Dense Wavelength Division Multiplexing), HSRP (Hot Standby Router Protocol), HTTP (HyperText Transport Protocol), IPsec (IP Security), IPv4, IPv6, Identify Issues, Internet Group Multicast Protocol (IGMP), Label Distribution Protocol (LDP), Netflow, Network Administration/Management, Network Architecture/Engineering, Network Performance/Analysis, Network Support, Open Shortest Path First Protocol (OSPF), Operational Support, Optical Networking, SONET, T-1 / DS1, T-3 / DS3, TACACS (Terminal Access Controller Access Control System), TCP (Transmission Control Protocol), VLAN (Virtual Local Area Network), VPN (Virtual Private Network)