When networking in an environment with interference and multiple computers, networks or hubs.

When the distance between the computer and the wireless access point or wireless router is too great for the internal wireless network interface card to receive the wireless signal.

Interference can be caused by many environmental factors such as microwaves (such as from a microwave oven), metal appliances or metallic coating or an impeded line of sight.When there is no wireless hotspot in an area.Wireless repeaters are commonly used to improve signal range and strength within homes and small offices. However, as far as the original router or access point is concerned, only the repeater MAC is connected, making it necessary to enable safety features on the wireless repeater. Those outside of the primary network will be able to connect through the new 'repeated' network.

Also, some wireless network interface controllers (WNIC)s optionally support operating in such a mode. It can be a specialized stand-alone computer networking device. When two or more hosts have to be connected with one another over the IEEE 802.11 protocol and the distance is too long for a direct connection to be established, a wireless repeater is used to bridge the gap. A wireless repeater (also called wireless range extender or wifi extender) is a device that takes an existing signal from a wireless router or wireless access point and rebroadcasts it to create a second network.

Wireless wifi extender