When designing a new WLAN infrastructure, you also need to be aware of how the...

Understanding both the physical layout and logical configuration of the network is critical. The two most helpful documents for that are:

Blueprints:Provide the architectural layout of the facility, including walls, materials, and structural elements that affect RF propagation.

Network Closet Locations:Identify where networking equipment such as switches and patch panels are located for physical cabling and AP backhaul planning.

From CWDP-305:

“Accurate blueprints and physical infrastructure documentation, such as IDF/MDF locations, are essential for physical and logical WLAN planning.”

— Reference: CWDP-305 Official Study and Reference Guide, Chapter on Wireless Design Process