In high-density venues such as stadiums or convention centers, the presence of large crowds significantly impacts Wi-Fi signal propagation. Human bodies consist mostly of water, which absorbs and attenuates radio frequency (RF) signals, especially in the 2.4 GHz and 5 GHz bands commonly used by Wi-Fi. This absorption leads to reduced signal strength and potential connectivity issues during events when the venue is filled with people.
Designing a WLAN for such environments requires careful consideration of crowd density and its impact on RF signals. Strategies may include increasing the number of APs, using directional antennas to focus coverage, and conducting site surveys during events to assess real-world performance.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Designing for Specific Applications

Any deviation from the RF design plan, including changes in AP placement, can significantly impact the performance and coverage of the WLAN.Therefore, it's crucial to consult the RF designer before making any alterations.The RF designer can assess the proposed changes and determine if they align with the overall network design objectives or if adjustments are necessary to maintain optimal performance.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Wireless Design Process

If a persistent source of interference cannot be removed, the best course of action is to design around it- usually by changing channels to avoid the affected frequencies. This minimizes the impact on WLAN operation while still coexisting with the interfering device.
From CWDP-305:
"If interference is detected during post-deployment validation and cannot be mitigated by removal, channel reallocation is the most effective way to work around the problem without affecting WLAN integrity."
- Reference: CWDP-305 Official Study Guide, Post-Design ValidationandTroubleshooting

Comprehensive and Detailed Explanation:
Modulation is the technique of varying a carrier signal's properties-such as amplitude, frequency, or phase- to encode and transmit data. This process allows the transmission of information over various mediums, including radio frequencies used in wireless communications.
Option A:Describes spread spectrum techniques, not modulation.
Option B:Is a partial description but lacks the specificity of how the carrier is modified.
Option D:Is a vague statement that doesn't accurately define modulation.
Reference:CWDP-305 Study Guide, Chapter on RF Fundamentals - Modulation Techniques.

For accurate deployment of access points in a multi-floor indoor environment, providing a camera and marking tools is essential. A camera allows the installation team to reference visual cues from the design, ensuring APs are placed in the correct locations. Marking tools help in identifying precise mounting points on ceilings or walls, facilitating adherence to the design plan. These tools, combined with the design documentation, enable the installation team to execute the deployment accurately, maintaining the integrity of the WLAN design.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Wireless Design Process