CWS Wireless Client Devices Flashcards

Which Wi-Fi client power-saving mechanism allows an access point to buffer frames for a sleeping client and deliver them upon request?

Answer: Legacy Power Save (PS-Poll)

Legacy Power Save uses PS-Poll frames to request buffered unicast data from the AP after waking.

A wireless client associates but cannot obtain an IP address. The most likely Layer 2 issue to investigate first is:

Answer: 4-Way Handshake failure

A failed 4-Way Handshake prevents successful association completion, blocking all traffic including DHCP.

What is the primary purpose of the 802.11 Probe Request frame sent by a wireless client?

Answer: To actively discover available BSSs

Probe Requests are sent by clients to actively scan for SSIDs and gather AP capability information.

Which client device setting controls how aggressively the client roams away from an AP with a degrading signal?

Answer: Roaming aggressiveness / sensitivity

Roaming aggressiveness (or sensitivity) determines the RSSI threshold at which a client will scan and reassociate to a better AP.

A dual-band 802.11ac client is connected to a 2.4 GHz radio. What feature could the AP use to encourage the client to use the 5 GHz band?

Answer: Band steering

Band steering techniques (e.g., delaying Probe Responses on 2.4 GHz) encourage capable clients to associate on 5 GHz.

Which frame type does a wireless client transmit to gracefully disconnect from an AP?

Answer: Disassociation frame

A Disassociation frame is sent by the client to terminate the association while keeping the authentication state.

What does the term 'sticky client' describe in a Wi-Fi environment?

Answer: A client that remains associated to a far or weak AP instead of roaming to a closer one

A sticky client fails to roam to a closer or stronger AP, degrading its own throughput and potentially affecting channel airtime.