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

Encrypts frames between the STA and the AP

Answer

Manages the contention window for channel access

Answer

Provides IP address assignment to wireless clients

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

TPC (Transmit Power Control)

Answer

BST (Band Steering Technology)

Answer

DFS (Dynamic Frequency Selection)

Question 3

What is the maximum theoretical throughput of 802.11g?

Accepted Answer

54 Mbps

Answer

11 Mbps

Answer

22 Mbps

Answer

72 Mbps

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

PCF (Point Coordination Function)

Answer

HCF (Hybrid Coordination Function)

Answer

EDCA (Enhanced Distributed Channel Access)

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

Increases its transmit power to overcome the hidden node

Answer

Switches to a non-overlapping channel automatically

Answer

Sends a de-auth frame to the conflicting station

Question 6

Which element in a 802.11 Beacon frame tells clients the interval at which Beacons are transmitted?

Accepted Answer

Beacon Interval field

Answer

Capability Information field

Answer

DTIM Count field

Answer

TIM (Traffic Indication Map) element

Question 7

In 802.11ax, what does 'Target Wake Time' (TWT) primarily accomplish?

Accepted Answer

Negotiates scheduled wake intervals so IoT/battery devices sleep longer and reduce channel contention

Answer

Sets the time an AP must wake to process management frames

Answer

Defines the wakeup latency after a DTIM beacon for power-save clients

Answer

Specifies the deadline for a TXOP burst to complete