A SOHO has had several issues with various unauthorized devices consuming the network's bandwidth. There are only four network devices that are authorized to access the Internet as well as the local…

Complex passwords strengthen authentication credentials but do not prevent a device that already has the wireless password from connecting.

Disabling static IP addresses has no effect on network access; unauthorized devices can still receive an IP from DHCP and connect normally.

Disabling switch ports could block wired connections to specific ports but does not control which wireless devices can associate with the access point.

MAC filtering on the router or access point allows the administrator to specify the exact MAC addresses of the four authorized devices and deny all others. When an unauthorized device attempts to connect, its MAC address is not in the approved list and access is denied, directly preventing bandwidth consumption.