CWDP Capacity Planning and High-Density Design

Question 1

What is the recommended approach for AP placement in a high-density wireless environment?

Accepted Answer

Deploy APs at lower power with more density and use smaller cells with directional antennas

Answer

High-density environments require more APs at lower power levels to create smaller cells, reducing co-channel interference and providing dedicated capacity per area, often using directional antennas to control coverage.

Question 2

How should channel planning be approached in a multi-floor building to minimize co-channel interference?

Accepted Answer

Use a 3D channel reuse pattern ensuring the same channel is not used on adjacent APs vertically or horizontally

Answer

A 3D channel reuse plan considers both horizontal and vertical AP adjacencies, ensuring that co-channel APs are separated by enough distance and floor attenuation to prevent significant co-channel interference.

Question 3

What is airtime fairness and why is it important in WLAN design?

Accepted Answer

A mechanism ensuring slow clients don't monopolize the wireless medium, degrading performance for faster clients

Answer

Airtime fairness allocates equal time on the wireless medium to each client regardless of their data rate, preventing slow clients from consuming disproportionate airtime and degrading the experience for faster clients.

Question 4

What factors determine the number of APs needed for a high-density deployment?

Accepted Answer

Number of concurrent clients, application bandwidth requirements, and acceptable contention ratio

Answer

Capacity planning considers the expected number of concurrent devices, bandwidth requirements per application, acceptable contention ratios, device capabilities, and traffic patterns to determine AP count.

Question 5

What is band steering and how does it benefit wireless network performance?

Accepted Answer

Encouraging dual-band clients to connect to the 5 GHz band for better performance and reduced 2.4 GHz congestion

Answer

Band steering detects dual-band capable clients and encourages them to connect to the 5 GHz band, which typically offers more available channels, wider channel widths, and less congestion than the crowded 2.4 GHz band.

Certified Wireless Design Professional (CWDP) Practice Test

Certified Wireless Design Professional (CWDP) Practice Test

CWDP Capacity Planning and High-Density Design