CWNA WLAN Design & Site Survey 3

Question 1

What is the purpose of a post-deployment validation survey?

Accepted Answer

To verify that the deployed WLAN meets the original design requirements

Answer

To plan initial AP placement before installation

Answer

To update AP firmware to the latest version after installation

Answer

To add additional APs to an already operational network

Question 2

Which site survey methodology involves associating with APs and actively measuring actual connection performance such as throughput and latency?

Accepted Answer

Active survey

Answer

Passive survey

Answer

Predictive survey

Answer

Noise floor survey

Question 3

From an RF perspective, what is the fundamental requirement for supporting seamless client roaming between APs?

Accepted Answer

Adjacent APs must have overlapping coverage areas so the client can detect both simultaneously

Answer

All APs must broadcast identical SSIDs and use the same channel

Answer

All APs must operate at maximum transmit power

Answer

APs must be placed no more than 50 feet apart regardless of environment

Question 4

What is the main advantage of the 5 GHz band over the 2.4 GHz band for enterprise WLAN design?

Accepted Answer

More non-overlapping channels available and significantly less RF congestion

Answer

Greater range and superior penetration through concrete walls

Answer

Native backward compatibility with legacy 802.11b devices

Answer

Lower cost access points that support the band

Question 5

What is multipath and how does it affect WLAN performance?

Accepted Answer

RF signals reflecting off surfaces and arriving at the receiver at slightly different times, causing signal distortion

Answer

Multiple APs transmitting on the same channel simultaneously, causing packet collisions

Answer

The use of multiple spatial streams via MIMO antenna technology

Answer

Multiple clients simultaneously contending for the wireless medium

Question 6

During a site survey you observe an AP with -45 dBm RSSI at a client location, yet clients report poor throughput. What is the most likely cause?

Accepted Answer

A high noise floor is causing poor SNR despite the strong received signal

Answer

The AP transmit power is configured too low for the environment

Answer

The client is located too far from the AP antenna

Answer

The AP is configured with an incorrect channel width setting

Question 7

What is the recommended channel planning approach for a multi-AP 5 GHz deployment to maximize capacity and minimize interference?

Accepted Answer

Systematically assign non-overlapping channels to adjacent APs to minimize co-channel interference

Answer

Assign channels randomly across all APs to spread interference evenly

Answer

Use only UNII-1 channels (36, 40, 44, 48) to avoid DFS requirements on all APs

Answer

Configure all APs to use the same channel so clients can associate to the strongest signal