Computer Network technician Job

We are looking for a candidate suitable to take the position of Computer Network Technician in our company .
The following job duties are to be performed :

Perform routine network start up and close down and maintain control records
Install, maintain, troubleshoot and upgrade Web-server hardware and software
Set up local area networks and connections to the Internet
Perform Web-server backup and recovery operations
Maintain, troubleshoot and administer the use of local area networks (LANs), wide area networks (WANs), mainframe networks and computer workstations and peripheral equipment
Evaluate and install computer hardware, networking software and operating system software
Load computer tapes and disks and install software and printer paper and forms
Implement data, software and hardware security procedures

Candidate must have at least 1-2 years of experience in the same field .
Should have required knowledge of computer in following fields.
Linux
Unix
Networking hardware
Networking security
Extranet
Internet
MS Windows
MAC