Because Layer 2 switches use MAC addresses for communication, and each port is assigned a MAC address, VLANs are considered a Layer 2 solution for segmenting a network.
Centralized Management of Wireless Networks is made possible by a lightweight wireless protocol such as Crisco's proprietary lightweight Access Point Protocol (LAPP). This makes it so that it directs all wireless frames to a controller by adding extra headers to the frames.
Only Class B and Class C networks can be subnetted.