Linux Environment • Sendmail, Mail server configuration with mail box quota also with Pop or IMAP account.• DNS Server, for host name resolution or vice-versa i.e.: implementing forward lookup zone and reverse lookup zone. • DHCP Server, for automatic IP address assigning with exclusions based on IP address or MAC address.• Apache Web Server for hosting single website and / or multiple web sites using Virtual Hosting, also with authentication for specific pages or websites. • Samba Server for connectivity between Windows and Linux systems, sharing directories printers and managing Samba shares.• Squid, a Proxy Server with Reverse Proxy setting, bandwidth allocation and implementing security using access list.• NIS, Network Information Service Systems for centralized user administration.• FTP server, for sharing or publishing data with name based authentication security.• NFS Server, for sharing directories in Linux Environment. Security:• TCP-Wrappers for allowing or denying for required host, network, and domain for various services. • Using Extend Internet Daemon for allowing or blocking the use of xinetd dependent services like telnet, ftp, cups (printing service), etc.• Using Firewall, iptable based network layer or transport layer security for specific ports or IP address. • File System Security with ext2 and ext3, which includes user and groups read write and executable permission also with some special permissions setuid setgid sticky bit.• Boot loader security using grub password.Administration:• Installation of Linux using NFS, FTP, HTTP, also with Kickstart mode.• User and Group administration.• Maintaining and monitoring system or security logs with Syslog.• Managing Quota (disk space limitation) for users and groups.• Scheduling jobs using cron.• NIS user administration using autofs.• Managing Printers.• Backup and Restore of data.• RPM installation and upgradation.• Using Raid 0, 1, 5 for performance and redundancy.