Final answer:
The easiest method to restrict a SOHO wireless network to two computers is by enabling MAC filtering, which permits network access exclusively to devices with listed MAC addresses.
Step-by-step explanation:
The easiest way for a technician to limit the usage of a SOHO wireless network to two computers would be to enable MAC filtering. This is because MAC filtering allows the network administrator to create a list of permitted devices based on their Media Access Control (MAC) addresses, which are unique identifiers assigned to network interfaces. By adding only the MAC addresses of the two computers they wish to allow onto the network, the SOHO can effectively restrict access to just those devices. Other options such as assigning static IP addresses, changing signal strength, or disabling unused ports on the router are not as efficient in controlling access as MAC filtering.