Module07_-_deck_1

What is the recommended received signal strength for WLAN coverage design?

–70 dBm or stronger.

Why is a received signal of –70 dBm significant?

It is usually well above the noise floor and considered a quality received signal.

What does SNR stand for in WLAN design?

Signal-to-Noise Ratio.

What is the relationship between SNR and data corruption?

Low SNR can lead to data corruption and layer 2 retransmissions.

What is the acceptable SNR for voice-grade WLAN design?

25 dB or greater.

What effect does higher transmit power have in WLAN design?

Can lead to capacity problems and increased co-channel interference (CCI).

What does the acronym TPC stand for?

Transmit Power Control.

What do roaming design thresholds generally involve?

Signal strength, SNR, and bit-error rate.

What is the concept of primary and secondary coverage in WLAN design?

Each client station needs to hear one primary AP and a secondary AP for better coverage.

What is the main concern when designing for high-density WLAN environments?

Capacity design and managing airtime consumption.

What is the primary goal of channel reuse in WLAN?

Prevent co-channel interference.

In the 2.4 GHz band, how many non-overlapping channels exist?

Three.

What are DFS channels used for in WLAN design?

To avoid interference with radar systems.

Why is it important to disable lower data rates in WLAN design?

Reduces airtime consumption and increases performance.

What is an important aspect of load balancing in high-density WLANs?

Load balancing is not recommended if roaming is a requirement.

What often causes co-channel interference (CCI) in WLAN?

Client transmissions.

What should be considered when deploying multiple APs on different floors?

A channel reuse pattern is necessary to avoid overlapping frequencies.

What does channel bonding in WLAN enable?

The creation of larger channels (e.g., 40 MHz or 80 MHz) by using adjacent channels.

What is the effect of having multiple SSIDs in a WLAN?

Creates additional layer 2 management overhead.

What type of antennas are commonly used for directional coverage indoors?

Patch antennas.

What design consideration is important for high-density environments like stadiums?

Specialty antennas are needed for effective coverage.