Comprehensive and Detailed Explanation:
When troubleshooting 802.1X/EAP authentication issues, consider the following:
A:Ensure the RADIUS server is online and that the APs and WLAN controllers are configured to communicate with it on the correct port. Misconfigured ports can prevent authentication requests from reaching the server.
C:Verify that the authenticator (e.g., AP or controller) supports the EAP type configured on the client. A mismatch can lead to authentication failures.
D:If using certificate-based EAP methods (like EAP-TLS), confirm that the client's certificate is valid, not expired, and trusted by the RADIUS server. Certificate issues are common causes of authentication problems.
Note:
B:The RADIUS shared secret is configured between the authenticator and the RADIUS server, not on the client (supplicant). Therefore, this option is not applicable.
Reference:CWDP-305 Study Guide, Chapter on Post-Design ValidationandTroubleshooting - 802.1X/EAP Authentication Issues.

Comprehensive and Detailed Explanation:
Mounting APs above the ceiling can significantly degrade WLAN performance due to signal attenuation and unpredictable RF propagation.If aesthetic constraints were not communicated during the requirements gathering phase, the design likely does not account for the additional attenuation caused by ceiling materials.
Therefore, it's essential to inform the stakeholder that the current deployment does not meet performance requirements and that a redesign is necessary to address the unforeseen constraints.Pass4Success Reference: CWDP-305 Official Study and Reference Guide, Chapter on Post-Design ValidationandTroubleshooting

Comprehensive and Detailed Explanation:
High channel utilization can be caused by various factors, but one critical issue to rule out is the presence ofan RF signal generator causing a Denial of Service (DoS)attack. Such devices can emit continuous or intermittent signals that occupy the channel, preventing legitimate Wi-Fi communication. Identifying and eliminating such sources is essential for maintaining optimal network performance.
Low PHY rates: Can contribute to increased airtime usage but are not the primary concern in this context.
High workload or frame rates: Indicate heavy usage but not necessarily malicious interference.
Reference:CWDP-305 Study Guide, Chapter on Post-Design Validation - Spectrum Analysis and Interference Sources.

In a controller-based WLAN infrastructure, when the Wireless LAN Controller (WLC) and Access Points (APs) reside on different subnets, a router is essential to facilitate communication between them.The router enables inter-subnet routing, allowing APs to discover and communicate with the WLC.
The CWDP-305 Official Study and Reference Guide emphasizes the necessity of proper Layer 3 routing for APs to locate and join controllers across different subnets.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Infrastructure Design

Lower data rates, such as 1 Mbps, use simpler modulation schemes (e.g., BPSK) which are more robust against noise and require lower signal-to-noise ratios (SNR) for successful reception.This means that frames transmitted at lower data rates can be received over longer distances compared to higher data rates like 54 Mbps, which use more complex modulation schemes (e.g., 64-QAM) that require higher SNR and are more susceptible to signal degradation.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on ProtocolandSpectrum Analysis