Final answer:
Microwave ovens and mobile phones are two devices that commonly affect wireless networks by causing interference due to similar frequency ranges used in their operations.
Step-by-step explanation:
The two devices that commonly affect wireless networks are microwave ovens and mobile phones. Microwaves use similar frequencies as WiFi (2.4 GHz to 5.0 GHz range) and thus can cause interference with wireless networks in homes when they are leaky. Mobile phones, typically operating in the range of 1.9 GHz, can also affect wireless communications as they share frequencies used by critical communication or medical equipment, leading to the need to switch them off or place them in a non-communicative mode in certain sensitive environments such as airplanes and hospitals.
Moreover, Bluetooth is another wireless technology that operates in the 2.4-GHz range, and while it is designed to link nearby devices like headphones and hands-free car systems, it can also potentially interfere with other devices using the same frequencies. Therefore, gadgets like Bluetooth enabled devices could also be considered when troubleshooting interference in wireless networks.