What can be done to prevent unauthorized laptops from accessing a SOHO router?

Enabling MAC filtering can effectively prevent unauthorized laptops from accessing a SOHO (Small Office/Home Office) router. MAC filtering works by allowing only devices with specific Media Access Control (MAC) addresses to connect to the network. Each device on a network has a unique MAC address that identifies it. By configuring the router to accept connections only from approved MAC addresses, any devices not on the list will be denied access, thereby providing a layer of security against unauthorized use.

While other options may enhance network security, they do not directly address the issue of controlling device access as effectively as MAC filtering. Creating a DMZ (Demilitarized Zone) is more relevant for managing network segments and public-facing services rather than controlling which laptops can connect to the main network. Configuring a complex SSID can help obscure the network name from potential attackers but does not prevent unauthorized devices from connecting if they know the SSID. Disabling physical ports can restrict access to wired connections but does not apply to wireless devices and has limited use in most home environments.