Comprehensive and Detailed Explanation:
Using wider channel widths like 80 MHz can increase throughput but also reduces the number of available non-overlapping channels, leading to increased co-channel interference (CCI), especially in dense environments.Reconfiguring APs to use 20 MHz channel-widths enhances frequency reuse and minimizes CCI, thereby improving application performance in an All-Wireless-Office setup.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Post-Design ValidationandTroubleshooting

When conducting a predictive site survey, it's essential to configure the simulated APs to reflect the expected real-world conditions.If dynamic Radio Resource Management (RRM) will be utilized, setting the AP transmit power to an estimated average level that matches the expected client devices, such as 25 mW, ensures that the predictive model accurately represents the operational environment.This approach helps in designing a WLAN that provides optimal coverage and performance.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Advanced Site Surveys

A Wireless Intrusion Prevention System (WIPS) is a network security solution that monitors wireless LANs for unauthorized or malicious activity and provides real-time or automated responses. WIPS can perform a wide array of functions as outlined below:
A: Distributed protocol analysis:
WIPS sensors continuously scan wireless traffic and analyze frames to detect anomalies or policy violations in real time.
C: Performance monitoring and response:
WIPS can identify degradation in WLAN performance due to interference, misconfiguration, or rogue activity and alert administrators or take corrective action.
D: Data forensics and analysis:
WIPS platforms often include historical logging and reporting features that allow administrators to review past events and understand the timeline and impact of wireless threats.
E: Automated threat mitigation:
WIPS can automatically respond to threats by sending deauthentication frames, blocking MAC addresses, or disabling ports to mitigate rogue devices or attacks.
Note:
B: Client access to the distribution system is not a function of WIPS; it refers to client functionality in a WLAN, not a security service offered by WIPS.
"A WIPS performs functions such as rogue detection and mitigation, threat classification, forensic logging, and real-time protocol analysis. It can provide both historical analytics and proactive security enforcement."
- CWDP-305 Study Guide, Chapter on Post-Design ValidationandTroubleshooting

Comprehensive and Detailed Explanation:
A signal with a low duty cycle indicates that it is active only for short periods and remains inactive for the majority of the time.Such signals typically have minimal impact on WLAN performance because they occupy the channel infrequently, allowing Wi-Fi transmissions to occur during the inactive periods.Therefore, while it's essential to be aware of such signals, they generally do not pose significant interference to WLAN operations.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on ProtocolandSpectrum Analysis

If QoS markings are correct from the client to the AP but incorrect from the AP to the client, it's likely that the QoS markings are being stripped or not trusted somewhere on the wired network between the controller and the AP. This misconfiguration can result in the AP transmitting frames without the appropriate QoS markings, affecting voice quality.
Reference: CWDP-305 Official Study Guide, Chapter on ProtocolandSpectrum Analysis