Which of the following tasks involves a Network Administrator?

The task of installing new server hardware and applications is a core responsibility of a Network Administrator. This role focuses on managing the organization's networking and computing infrastructure. Network Administrators are responsible for ensuring that servers are properly installed, integrated, and operational to support the organization's needs. They often oversee the configuration, maintenance, and optimization of servers, ensuring that all necessary applications are installed and running efficiently.

The other tasks listed do not align with the primary duties of a Network Administrator. Creating engaging website content and modifying website layouts are generally responsibilities associated with web content creators and web designers. Designing game levels pertains to game development roles that require a different skill set focused on creativity and technical proficiency specific to gaming environments. These roles do not involve the network and server administration tasks that are central to the work of a Network Administrator.