Dynamic Frequency Selection (DFS) channels are shared with radar systems, such as those used in airports.
Enabling DFS in such environments can lead to interference with radar operations and cause APs to frequently change channels, disrupting WLAN stability.Therefore, DFS channels should not be enabled in airport environments.
The CWDP-305 Official Study and Reference Guide advises against the use of DFS channels in areas where radar systems operate to prevent potential interference and ensure network reliability.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Designing for Specific Applications

Comprehensive and Detailed Explanation:
In a centralized WLAN architecture, the WLAN controller is responsible for managing QoS (Quality of Service) settings. When sending an 802.11 frame to a lightweight AP, the controller places the User Priority (UP) value in the QoS Control field of the 802.11 frame header. This ensures that the frame is transmitted with the appropriate priority over the wireless medium, maintaining QoS for applications such as voice and video.
Reference: CWDP-305 Official Study Guide, Chapter on Infrastructure Design

To ensure that Access Points (APs) are installed in the exact locations specified in the design, it's essential to use visual aids and physical markers.Cameras can capture images of the intended installation sites, and marking tools can be used to indicate precise mounting locations on-site.This approach minimizes errors during installation and ensures adherence to the design plan.
The CWDP-305 Official Study and Reference Guide highlights the use of such tools:
"Use cameras and marking tools to document and indicate AP placement, ensuring accurate installation according to the design." Reference: CWDP-305 Official Study and Reference Guide, Chapter on Post-Design ValidationandTroubleshooting

Comprehensive and Detailed Explanation:
Co-Channel Interference (CCI) in the 2.4 GHz band can significantly degrade WLAN performance due to the limited number of non-overlapping channels available.If the WLAN was primarily designed for 5 GHz, the
2.4 GHz band serves as a secondary or best-effort option.In such cases, turning off 2.4 GHz radios on some APs can reduce CCI by minimizing overlapping coverage areas, thereby improving overall network performance.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Post-Design ValidationandTroubleshooting

The Received Signal Strength Indicator (RSSI) is a measure of the power present in a received radio signal.
While it is commonly used in WLAN location-based services due to its simplicity and the fact that it doesn't require additional hardware, RSSI-based positioning is susceptible to environmental factors like multipath propagation and signal attenuation, leading to lower accuracy.
In contrast:
Angle of Arrival (AoA) determines the direction of the incoming signal, offering better accuracy.
Time of Arrival (ToA) measures the time it takes for a signal to travel from the transmitter to the receiver, providing precise distance measurements.
Time Difference of Arrival (TDoA) calculates the difference in arrival times between multiple receivers, enhancing location accuracy.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Designing for Specific Applications