CWDP Channel Planning and RF Design

Question 1

What is the primary goal of channel planning in a WLAN deployment?

Accepted Answer

Minimize co-channel interference between access points

Answer

Channel planning aims to minimize co-channel interference by ensuring APs using the same channel are spaced far enough apart that their signals do not significantly overlap.

Question 2

In the 2.4 GHz band, how many non-overlapping 20 MHz channels are available in the United States?

Accepted Answer

3

Answer

Only channels 1, 6, and 11 are non-overlapping in the 2.4 GHz band in the US, giving exactly 3 usable non-overlapping channels.

Question 3

What is co-channel interference (CCI) in a WLAN environment?

Accepted Answer

Interference between access points operating on the same channel

Answer

CCI occurs when two or more APs share the same channel and their coverage areas overlap, causing them to contend for airtime and degrade performance.

Question 4

Which channel planning strategy assigns the same channel to APs that are sufficiently separated to prevent interference?

Accepted Answer

Frequency reuse planning

Answer

Frequency reuse planning deliberately reuses the same channels at APs spaced far enough apart so their coverage cells do not interfere with each other.

Question 5

In the 5 GHz band using 20 MHz channels, approximately how many non-overlapping channels are available in the US across UNII-1, UNII-2, UNII-2e, and UNII-3?

Accepted Answer

25

Answer

The US 5 GHz band provides approximately 25 non-overlapping 20 MHz channels when all available UNII sub-bands are considered, making it far richer than 2.4 GHz.

Certified Wireless Design Professional (CWDP) Practice Test

Certified Wireless Design Professional (CWDP) Practice Test

CWDP Channel Planning and RF Design