1. Install, upgrade and monitor software and hardware.
2. They usually maintain the essentials such as operating systems, business applications, security tools, web-servers, email, PCs, local and wide area networking both hardware and software and mid-range server hardware.
3. change security settings, install software and hardware, access all files on the computer, and make changes to other user accounts.
4. Installing and configuring software, hardware and networks.
5. Monitoring system performance and troubleshooting issues.