Hardware Maintainance i.e preventive which involves tests, measurements, adjustments, and parts replacement, performed specifically to prevent faults from occurring. It involves
Computer Repairs and upgrades
Computer Upgrades
Troubleshooting computer hardware and computer accesory problems
NETWORK MAINTAINANCE
Regular network checking
Adding and removing of IP’s,
Subnet maintenance,
Domain setup and maintenance,
Troubleshooting and resolving of problems on the network,
Troubleshooting of related hardware attached to the network,
Setup and changes to security polices,
Adding and removing of users,
Implementing filtering and anti-spam solutions.
SYSTEMS MAINTAINANCE
Systems management is the management of the information technology systems in an enterprise. This includes gathering requirements, purchasing equipment and software, distributing it to where it is to be used, configuring it, maintaining it with enhancement and service updates, setting up problem-handling processes, and determining whether objectives are being met.
Computer Repairs and upgrades 
