CWS CWS WLAN Roaming and QoS Questions and Answers 3

Question 1

Which 802.11 feature allows a client to request a neighbor report from its currently associated AP?

Accepted Answer

802.11k Neighbor Report Request

Answer

802.11v BSS Transition Query

Answer

802.11r Pre-Authentication

Answer

802.11u GAS Request

Question 2

What is the purpose of the AIFS (Arbitration Inter-Frame Space) in EDCA?

Accepted Answer

Defines the minimum idle time before a traffic category may begin contending for the channel

Answer

Sets the maximum frame size for a burst

Answer

Configures the encryption key refresh interval

Answer

Determines the beacon transmission interval

Question 3

In a 802.11r over-the-air fast transition, what frames does the client use to complete the roam?

Accepted Answer

Authentication and Reassociation frames with FT IEs

Answer

Probe and Association frames only

Answer

EAPOL 4-way handshake frames

Answer

Deauthentication and new Association frames

Question 4

Which AC_BK (Background) traffic characteristic distinguishes it from AC_BE (Best Effort)?

Accepted Answer

AC_BK uses a larger CWmin and longer AIFS, resulting in lower priority than AC_BE

Answer

AC_BK uses stronger encryption

Answer

AC_BK is reserved for management frames

Answer

AC_BK has a shorter TXOP limit than AC_VO

Question 5

What problem does load balancing address in a multi-AP WLAN deployment?

Accepted Answer

Prevents too many clients from associating with one AP while nearby APs are underutilized

Answer

Reduces RF interference between co-channel APs

Answer

Eliminates hidden node collisions

Answer

Distributes DHCP leases evenly

Question 6

Which protocol is used by a WLAN controller to request that a client roam to a different AP under 802.11v?

Accepted Answer

BSS Transition Management Request

Answer

RADIUS Change of Authorization

Answer

EAP Re-Authentication Protocol

Answer

DHCP Inform