CWS CWS WLAN Roaming and QoS Questions and Answers 2

Question 1

Which QoS mechanism in 802.11 replaces the legacy DCF for differentiated traffic handling?

Accepted Answer

EDCA (Enhanced Distributed Channel Access)

Answer

HCCA (HCF Controlled Channel Access)

Answer

PCF (Point Coordination Function)

Answer

RTS/CTS

Question 2

What roaming threshold metric do most enterprise WLAN controllers use to trigger a client roam?

Accepted Answer

RSSI below a configured dBm threshold

Answer

AP CPU utilization above 80%

Answer

Client IP address conflict

Answer

Channel utilization above 50%

Question 3

In 802.11r, what is stored in the PMK-R0 key holder?

Accepted Answer

The top-level fast transition key derived from the master session key

Answer

The per-packet encryption key

Answer

The pairwise master key for a single AP

Answer

The RADIUS server certificate

Question 4

Which TXOP parameter in WMM defines the maximum time a station may transmit after winning channel access?

Accepted Answer

TXOP Limit

Answer

CWmax

Answer

AIFSN

Answer

CWmin

Question 5

What is the primary benefit of deploying both 802.11k and 802.11v together in an enterprise WLAN?

Accepted Answer

Clients receive neighbor reports AND network-assisted roaming suggestions for seamless handoffs

Answer

Higher throughput via channel bonding

Answer

Stronger encryption during roaming

Answer

Reduced beacon overhead

Question 6

What does DSCP marking accomplish for wireless QoS in a unified wired/wireless network?

Accepted Answer

Maps IP-layer traffic priority to WMM Access Categories across the wired-wireless boundary

Answer

Assigns static channels to APs

Answer

Configures RADIUS authentication priority

Answer

Encrypts QoS tags at Layer 2