What is the primary purpose of network diagnostics?

The primary purpose of network diagnostics is to troubleshoot and resolve issues within the network. This process involves identifying, examining, and rectifying problems that may be affecting network performance or connectivity. Network diagnostics tools and techniques allow technicians to gather information about the network’s status, performance metrics, and possible faults. By analyzing this data, they can pinpoint the source of issues, whether it be misconfigurations, hardware failures, or software problems, enabling them to restore optimal functionality.

While the other options touch on aspects related to networking, they do not encapsulate the primary focus of network diagnostics. Improving the physical layout of a network and upgrading hardware components are important aspects of network design and maintenance but do not specifically address the diagnostic aspect of identifying and resolving problems. Monitoring internet usage can be relevant for security and performance evaluation but isn't the primary goal of diagnostics itself. Therefore, troubleshooting and resolving network issues stands as the core function of network diagnostics.