Installation, maintenance and failure analysis of networks. High-availability systems, mass storage, remote backup, and monitoring equipment and services. * Installation and maintenance. * Firewalls. * VPNs. * DMZs * Planning, installation and configuration of GNU/Linux systems as both free and open source systems. * Mail servers with spam and virus filters. * Web servers (Apache, MySQL and PostgreSQL). * Proxy servers. * RAID, SAN and NAS systems. * Database servers (MySQL, Postgresql). * Implementation of VoIP telephony systems. * Fax servers. * Virtualization of systems (for production, development and testing systems). * Remote Backup systems. * Monitoring systems. * Corporate instant messaging servers. * Control, preventive analysis and resolution of faults in networks. * Installation and configuration of DNS servers. Procedures for management of domains. * DHCP servers. * Servers for management of UPS's. * Installation and configuration of high availability clusters.