Which device interference could cause intermittent wireless dropouts in a home network with no encryption?

• A. CB radio
• B. 2.4Ghz Cordless phones
• C. Satellite television
• D. Computers on his wired network

Answer: (B)

Interference from other devices that share the same radio frequency as the Wi‑Fi network is what causes intermittent dropouts. Wi‑Fi on the 2.4 GHz band competes with many consumer devices, and a cordless phone operating in the same 2.4 GHz spectrum can transmit and collide with Wi‑Fi signals. When that happens, the network has to back off and retry transmissions, producing dropouts, especially when the phone is in use.

The other options don’t fit this interference scenario: CB radio operates around 27 MHz, far outside the 2.4 GHz Wi‑Fi band; satellite television uses much higher frequencies; computers on a wired network aren’t transmitting over the wireless airwaves and thus don’t cause wireless interference. Encryption status isn’t the issue here; the setting points to a radio-frequency interference problem, best explained by the cordless phone in the 2.4 GHz band.