Final answer:
When several networks above -85 dBm are partially overlapping, it can cause interference and degrade signal quality. This interference can be either constructive or destructive, based on the phase and amplitude of the signals. To minimize overlap and interference, it is advisable to use different channels.
Step-by-step explanation:
If there are several networks above -85 dBm that are partially overlapping, it can cause interference and result in a degraded signal quality. When signals overlap, they can create a phenomenon called constructive or destructive interference, depending on the phase and amplitude of the signals. Constructive interference occurs when signals reinforce each other and result in a stronger signal, while destructive interference occurs when they cancel each other out and weaken the signal.
For example, in the case of Wi-Fi networks operating at frequencies between 2.4 to 5 GHz, if several networks are partially overlapping, the signals may interfere with each other and affect the data transfer speeds and reliability of the connections. It is advisable to use different channels to minimize overlap and reduce interference.