Good practical and documentational knowledges on Vmware vSphere 5.x products : Vmware Esxi, Vmware vCenter Server, Vmware Site Replication(SRM), Vmware Log Insight, Vmware Clustering Technology, Vmware Networking, Vmware Converter(converting phsycial host to esxi environment and vice versa);

Configuring Vmware Esxi (vCenter Server, vCenter Appliance) with Cisco switch, HP switch over VLAN;

Configuring and Administration Linux/Unix distributions : Centos, Debian, FreeBSD Unix distrubition, PfSense firewall(with packages);

NAS(Network Attached Storage)- FreeNAS, Nas4Free (integration with Windows Server 2008R2/2012R2);

Other Linux/Unix skills: Samba, Kerberos, DNS Server, DHCP Server, Iptables;

Windows Skills: Windows Server 2008R2, Windows Server 2012R2 Datacenter configuring and maintenance, Active Directory, DNS, DHCP, ISA2006/Forefront TMG 2010, Certification Server, Exchange Server 2010/2013( front-end Exchange, back-end Exchange Server, OWA), Lync 2013 Server, Group Policy, MS-SQL Server, IIS/Apache;

Backup Skills: Symantec Backup Exec, Veeam Backup and Replication for vmware products(OS level and VM level);

Good troubleshooting and analyze skills(specially over vmware products);

Antivirus Server, Anti-Spam configuration over Exchange Server;

OSI, Network Topology;

Windows Skills: Windows Server 2008R2, Windows Server 2012R2 Datacenter configuring and maintenance, Active Directory, DNS, DHCP, ISA2006/Forefront TMG 2010, Certification Server, Exchange Server 2013( front-end Exchange, back-end Exchange Server, OWA), Lync 2013 Server, Group Policy, MS-SQL Server, IIS