CWS CWS Wireless Client Devices 5

Question 1

A client connected at 802.11n HT40 on 2.4 GHz is experiencing frequent retransmissions. What is the most likely root cause?

Accepted Answer

HT40 on 2.4 GHz overlaps with adjacent-channel BSSs causing heavy co-channel interference

Answer

40 MHz channels on 2.4 GHz consume most of the available spectrum, causing severe interference with neighboring networks.

Question 2

Which driver or OS-level setting on a Windows laptop most directly controls whether the Wi-Fi adapter scans for better APs while connected?

Accepted Answer

Roaming Aggressiveness

Answer

The Roaming Aggressiveness setting in the Windows Wi-Fi adapter advanced properties controls how often and at what signal threshold the client scans for better APs.

Question 3

What is the purpose of the 802.11v BSS Transition Management feature from a client perspective?

Accepted Answer

It allows the AP to suggest that the client roam to a different AP

Answer

802.11v BSS Transition Management lets the AP send requests/suggestions for a client to roam, enabling load balancing and steering.

Question 4

A wireless VoIP client experiences choppy audio only when roaming between APs. Which combination of 802.11 amendments best addresses this issue?

Accepted Answer

802.11k, 802.11r, and 802.11v

Answer

802.11k (neighbor reports), 802.11r (fast roaming), and 802.11v (BSS transition) together minimize roam latency for real-time applications.

Question 5

Which value in a client's received frame indicates the modulation and coding scheme used, directly affecting the data rate?

Accepted Answer

MCS index

Answer

The MCS index defines the combination of modulation order, coding rate, and guard interval that determines the PHY data rate.

CWS Exam Practice Test

CWS Exam Practice Test

CWS CWS Wireless Client Devices 5