Final answer:
In a wireless LAN (WLAN), multipath interference can be caused by reflection and scattering of signals, which can result in signal degradation and errors in data transmission.
Step-by-step explanation:
In a wireless LAN (WLAN), a 'multipath' problem can be caused by reflection and scattering of signals. When radio signals bounce off and scatter from nearby objects and surfaces, they can arrive at the receiver at different times, causing interference and signal degradation. This is known as multipath interference. The reflected signals can combine with the direct signal in a way that distorts the original signal and causes errors in data transmission.