Software:
L2: vlan, Etherchannel, vtp, stp.
L3: OSPF, EIGRP, RIP, static routing.
Services: NAT, DHCP, IP-SLA. PBR
Redundancy protocols: HSRP
DC:vPC,fex
OS: IOS, NX-OS.
WiFi: WPA2,802.1X,Radius
Win: 2003,2008,ISA Server,SMS 2003

Hardware:
Cisco: 29**, 35**, 72**, 45**,65**
Cisco Nexus:2000(fex),9000.
Cisco UCS C210 M2
Cisco CUCM
Cisco WLS 5508
Cisco ASA 5585
D-link: 3200,3526,1228 ME
Mikrotik CCR 1036 Series
Ubiquiti airMAX/M2/M5
Infinet