LAN/Broadband Technologies: Ethernet, ADSL, WiFi, GPON
Bridging Technology: STP,RSTP,MSTP
WAN Technologies: Frame-Relay, PPP, HDLC
Redundancy Protocols: GLBP, VRRP, HSRP,
High availability:(mitigation techniques of a single point of failure) SSO, PRP, RPR+, NFS, BFD, VSS, Stackwise,Channeling(Etherchannel: LACP, PAgP).
Network Protocols: IPv4, IPv6, IPX
IP services: DHCP, DNS, NAT
Routing Daemons: Quagga, BIRD
Routing Protocols: (ODR) RIP, OSPF, EIGRP, BGP
Traffic security/Tunneling Protocols: IPseec, GRE, DMVPN,PPPoE, PPTP, L2TP, ACLs, SSH, AAA/ACS.
Virtualization Technologies: VMware ESX
Experience with different hardware vendors as: Cisco(Routers:7200, 7609, CRS3; Switches: Cat2960,3550,3750,4507,6513 ), Huawei(Routers:CX600,NE40; Switches:S2300,3300,5328,9312)
Monitoring Tools: Cacti, Nagios, MRTG, Zabix, kiwi, SNMP