Installation of RHEL operating system software (RHEL 5.0-6.x) and multi-boot systems, system initialization and services, user administration, network configuration, installing printers, firewall (PFSense). · System installation and centralized administration of all applications on Linux and window servers, workstations & securing them from the vulnerability point of view · Installation and setup of asterisk software based IP-PBX / VOIP system; deployment of services include: VOIP, video conferencing over IP. · Conducting vulnerability analysis and studying about the vulnerabilities, their exploits; monitored the network for possible security breach, and resolved the same at the earliest. · Managed all new install projects for servers, switches, and other network resources. · Developed and updated documentation, appraising users and administrators of vital information; created user manuals and provided technical support sessions for new employees. · Created proactive procedures for problem preventions and resolutions, interfaced with software developers, analyzed issues, and designed solutions. Knowledge of DNS and DHCP protocols and configuration. Good knowledge of IP subneting. Windows, Linux based DNS, DHCP administration. Infoblox Platform based DNS, DHCP administration. Good knowledge on Perl & Shell Scripting.