Switches: Cisco, Dell, Avaya, Extreme Networks. AAA, VLANs, Port Channels, STP, QoS, ACL.
Routers: Cisco. AAA,HSRP, GLBP, IP SLA, QoS, ACL, BGP.
Wireless: Extreme Networks, Meraki.
Mail: Exchange, Office365.
OS: Windows Server (2003,2008,2012), Linux (Debian, CentOS).
Public Cloud: Microsoft Azure.
Private Cloud: Microsoft Hyper-V.
SAN: Dell EqualLogic.
Unified Communications: OCS 2007, Lync 2010, Lync 2013, Skype for Business
PBX: Asterisk.
Firewalls/VPN/IPS: Juniper, Fortinet.
Proxys: Microsoft TMG 2010, Fortinet.
NMS: Cacti, SolarWinds, Zabbix.
Tickets: Zentrak, Remedy BMC.
Links: Frame Relay, MPLS, TLS/L2L, VPN.
SIEM: Manage Engine Event Log Analyzer (Used in PCI DSS certification)
Others: Microsoft Teams, Planner, Microsoft PowerBI.