Comprehensive and Detailed Explanation:
For reliable Voice over Wi-Fi (VoWiFi) service, a minimum RSSI of -67 dBm is generally recommended.
This level ensures sufficient signal strength to support the quality of service required for voice applications, providing adequate signal-to-noise ratio (SNR) and minimizing the likelihood of dropped calls or poor audio quality.
Reference: CWDP-305 Official Study Guide, Chapter on Advanced Site Surveys

Comprehensive and Detailed Explanation:
In the "local MAC" variation of the centralized WLAN architecture, all MAC (Media Access Control) functions are performed by the Access Point (AP). A minimal subset of network control is offloaded to the WLAN controller, which also handles management and monitoring functions. This approach allows for more efficient processing at the edge of the network, reducing latency and improving performance.
Reference: CWDP-305 Official Study Guide, Chapter on Infrastructure Design

The Bill of Materials (BoM) is a comprehensive list detailing all hardware components, devices, and materials required for the deployment of a WLAN infrastructure. It serves as a reference for procurement and ensures that all necessary items are accounted for before the deployment begins. Unlike the Statement of Work, which outlines the scope and objectives, or the design report, which provides technical specifications, the BoM focuses specifically on the tangible components needed for implementation.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Wireless Design Process

In WLAN design software, defining different "requirement areas" allows the designer to assign distinct RF and performance requirements to different parts of the floor plan. For instance, a voice-critical conference room may require -67 dBm minimum signal strength and a specific SNR, whereas a storage area might only require basic coverage.
From CWDP-305:
"Requirement areas allow WLAN designers to set different RF performance targets such as minimum signal strength, SNR, and data rate for specific parts of the deployment area. This enables tailored design strategies."
- Reference: CWDP-305 Official Study and Reference Guide, Chapter on Wireless Design Process

In 802.1X/EAP authentication, the shared secret between the authenticator and the RADIUS server must match. If clients cannot associate and the RADIUS server is operational, the next step is to verify that the shared secret configured on both the authenticator and the RADIUS server is identical. A mismatch will prevent successful authentication.
Reference: CWDP-305 Official Study Guide, Chapter on Post-Design ValidationandTroubleshooting