CWS CWS 802.11 Standards and Protocols 5

Question 1

What is the role of the Distribution System (DS) in 802.11 architecture?

Accepted Answer

Interconnects multiple BSSs to form an Extended Service Set (ESS)

Answer

The Distribution System interconnects APs and bridges 802.11 frames to the wired backbone, allowing multiple BSSs to form a single ESS with seamless Layer 2 connectivity.

Question 2

Which 802.11 feature allows an AP to steer a dual-band capable client from 2.4 GHz to 5 GHz?

Accepted Answer

BSS Transition Management (802.11v)

Answer

802.11v BSS Transition Management lets APs send suggestions or requests to clients to transition to a different BSS, which can include steering to a less congested or higher-frequency band.

Question 3

What is the maximum theoretical throughput of 802.11g?

Accepted Answer

54 Mbps

Answer

802.11g achieves a maximum PHY rate of 54 Mbps using OFDM in the 2.4 GHz band, matching the speed of 802.11a in the 5 GHz band.

Question 4

Which channel access method is mandatory for all 802.11 STAs and serves as the baseline for medium contention?

Accepted Answer

DCF (Distributed Coordination Function)

Answer

DCF is the mandatory baseline medium access method based on CSMA/CA with random backoff, required for all 802.11 compliant stations.

Question 5

What does a STA do when it detects a 'hidden node' problem cannot be solved passively?

Accepted Answer

Enables RTS/CTS handshake to reserve the medium before transmitting

Answer

RTS/CTS allows a transmitting station to reserve the medium; the CTS frame is heard by stations that cannot hear the original sender, preventing collisions.

CWS Exam Practice Test

CWS Exam Practice Test

CWS CWS 802.11 Standards and Protocols 5