In this illustration, BSS 1 and BSS 2 are depicted as overlapping blue circles. Each basic service set includes a laptop computer and an access point (labeled AP 1 or AP 2). Each access point is connected to a central link-layer switch, labeled "Switch." A laptop computer labeled H1 appears in the area where the two basic service sets overlap, is shaded in blue, and includes a blue arrow pointing from left to right.