Answer:
A WAN is needed for the upgrade, but it has to be a network of wireless LANs or WLANs with both company floors having an Access point or wireless router and a wireless LAN controller with control and provisioning of wireless access points or CAPWAP.
Explanation:
A LAN or local area network is a network within a floor in a building with few workstations while a WAN spans from a build to a city with a network of several LANs. It Access point can be configured automatically with the wireless LAN controller (WLC) and online and offline connection and resource sharing can be made between the company floors in the building through the CAPWAP.