Cisco Unified Communications Manager Express, Cisco Wireless LAN Controller (WLC), Cisco Switches, 

Cisco Routers, HP Switches, HP Server ProLiant G6,7,8,9.

Switching: STP, VTP, HSRP, PVLAN, UDLD, DHCP Snooping, EtherChannel, MPLS, IEEE 802.11 Wi-Fi protocols.

Routing: IPV4/IPV6 Static Routing, RIP, EIGRP, OSFP, BGP, Access List, DHCP Relay.

VPN: IPsec, GRE, GRE over IPsec.

Automation of network equipment configuration: Writing of Python Scripts.

OS & Software installation/maintenance/support :

 Installation, administration of OS:

MS Windows Server 2012, 2016, CentOS, FreeBSD

VMware Server

Installation of vCenter Server, ESXI, management of VMware environments via 

vCenter Server, creating virtual machines, working with snapshots, backup.

Kerio Control :

Authorization with NTLM, filtering HTTP requests, speed limitation, monitoring.

Asterisk on base Centos:

Installation, maintenance, working with sip.conf, extensions.conf, features.conf, configuring with FXO, FXS, SIP Trunk.

Can create & maintain office telephony 

On base Microsoft Windows:

 Active Directories:

Creating forest, users, working with permissions, GPO, adding PCs to domain.