More than 6 years I work as a system administrator in a large Russian company of federal significance. I have a profound experience in setting up network equipment Cisco, HP, Huawei, Microtik, (VLAN, NAT, VPN, GRE, IPsec, QoS, IP SLA, Routing, Firewall) VOIP telephony on CUCM, CUCMexpress, CUBE, Asterisk. Monitoring Zabbix, Windows server 2003-2016, Hyper-V, MSSQL, IIS, Exchange