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

An AP-on-a-Stick survey is a method of validating a predictive design by placing an AP at each proposed location and measuring the signal coverage and performance. This allows the designer to verify the accuracy of the predictive design and make any adjustments if needed. An AP-on-a-Stick survey is more cost-effective and time-efficient than deploying all the APs and performing a passive or active site survey, which would require installing the APs, cabling, power, and network infrastructure. Using a client device to measure the signal from the AP locations is not a reliable way of validating the design, as it does not account for the interference, noise, and multipath effects that may affect the actual AP performance. Reference: 1: CWDP Certified Wireless Design Professional Official Study Guide: Exam PW0-304, Chapter 5, page 163.

Comprehensive and Detailed Explanation:
For enterprises requiring high network uptime, it's crucial to design for redundancy and failover in both the wireless and wired components of the network. This includes:
Wireless and Wired Network Failover:Ensuring that both wireless access points and wired infrastructure have redundancy to prevent single points of failure.
Physical Aspects (Power and Cabling):Implementing redundant power supplies, uninterruptible power supplies (UPS), and proper cabling practices to maintain network availability during power outages or hardware failures.
Reference:CWDP-305 Study Guide, Chapter on Infrastructure Design - High Availability and Redundancy Planning.