OS: FreeBSD/OpenBSD/NetBSD, Linux (Kali [ex. BackTrack], Cyborg Hawk, RedHat, ASP, Ubuntu, CenOS, SUSE, Debian), Solaris, Cisco IOS and Microsoft (9x, NT, 2000, 7, 8, Server 2008 R2) operating systems
Virtualization: VMWare ESX, VMWare Workstation, OpenVZ, KVM
CI/CD tools: Puppet, Ansible, Jenkins
IT Security: Firewalls , IDS/IPS (Snort+ACID, Suricata), SIEM, VPN, Anti-SPAM systems, Web application Security, Wireless Network Security, Cloud Security, Windows Security, Linux Security, Anti-VirusesPenetration tools
Network file systems: LVM, Lustre, GlusterFS, NFS
Monitoring: Nagios, Cacti, MRTG, basic knowledge of Splunk
Protocols: DNS, DHCP, TCP/IP, UDP, NetBIOS, RIP, BGP, HTTP/HTTPS, FTP, POP3, SNMP, IMAP, NFS, SSH, NTP, telnet
Databases: MySQL, PostgreSQL (PL/SQL), Transact SQL, Sybase
Web services and server management systems: Apache, Ngnix, WHM/CPanel, Ensim, Plesk, DirectAdmin, Webmin
Programming skills:
• C/C++, HTML, Ruby, PHP, Perl, Python, Bash scripting