the CWNP PW0-205 test training

1. Which of the following descriptions accurately describes IEEE 802.11 compliant Power Save mode operation in a DCF Basic Service Set?

A. Following a period of time in a low power state, client stations wake themselves and automatically poll the access point for traffic using a PS-Poll frame.

B. When the access point's buffer is full, the access point wakes all client stations using a PS-Poll frame so that they can receive the data.

C. Upon receiving traffic for a dozing station, the access point wakes the client station using a PS-Poll frame so that the client station can receive the data.

D. After waking from a low power state, client stations listen for the next beacon to determine if sending a PS-Poll frame to the access point is necessary.

E. After waking at a schedule TBTT, client stations automatically send Null Function frames to the access point with the Power Management bit cleared.

Answer: D

2. The Timestamp field, found in 802.11 Beacon Management frames, is 8 bytes in length and serves which of the following purposes?

A. Keeps all client stations in a BSS synchronized to within approximately 4 microseconds of the access point.

B. Allows client stations in the IBSS to pick the best of multiple beacons.

C. Used to notify client stations using power management features of how long their queued frames have been held by the access point.

D. Informs associating client stations how often to expect Beacon Management frames to be sent by the access point.

E. Allows all client stations in a BSS to calculate how long it took for the Beacon Management frame to traverse the wireless medium.

Answer: AB