Network and computer systems administrators typically do the following:

• Determine an organization's network and computer system needs before setting one up
• Install all network hardware and software and make needed upgrades and repairs
• Maintain network and computer system security and ensure that all systems are operating correctly
• Collect data in order to evaluate and optimize network or system performance
• Add users to a network and assign and update security permissions on the network
• Train users in the proper use of hardware and software
• Interpret and solve problems when a user or an automated monitoring system alerts them that one exists

Administrators manage an organization's servers and desktop and mobile equipment. They ensure that email and data storage networks work properly. They also make sure that employees' workstations are working efficiently and stay connected to the central computer network. Some administrators manage telecommunication networks.

In some cases, administrators help network architects design and analyze network models. They also participate in decisions about buying future hardware or software to upgrade their organization's network. Some administrators provide technical support to computer users, and they also may supervise computer support specialists who help solve users' problems.