What is the primary function of Media Access Control (MAC) Filtering?

The primary function of Media Access Control (MAC) Filtering is to filter unauthorized devices using their MAC addresses. Each network device has a unique MAC address assigned to its network interface, which serves as an identifier for that device on the network. By implementing MAC filtering, a network administrator can create a list of allowed MAC addresses, ensuring that only specific devices can connect to the network. This adds a layer of security by preventing unauthorized devices from accessing network resources and data.

The other options do not align with the core purpose of MAC filtering. Restricting user access based on job descriptions is more related to user role management and access controls rather than MAC addresses. Ensuring network speed is not compromised pertains to performance monitoring and optimization, which is outside the scope of MAC filtering. Enhancing wireless signal strength involves physical and technological improvements to the network infrastructure, which does not relate directly to the MAC filtering function.