CWS CWS 802.11 Standards and Protocols 4

Question 1

Which 802.11 amendment introduced the 6 GHz band for Wi-Fi operation?

Accepted Answer

802.11ax with 6 GHz (Wi-Fi 6E)

Answer

Wi-Fi 6E is the industry name for 802.11ax devices that also operate in the newly opened 6 GHz band, providing additional spectrum and reducing congestion.

Question 2

What is the maximum number of spatial streams supported by 802.11ac?

Accepted Answer

8

Answer

802.11ac supports up to 8 spatial streams with MU-MIMO, though real-world deployments typically use 3–4 streams.

Question 3

In the context of 802.11 DCF, what does the acronym DIFS stand for?

Accepted Answer

Distributed Inter-Frame Space

Answer

DIFS (Distributed Inter-Frame Space) is the minimum idle time a station must wait before attempting a transmission using the DCF contention method.

Question 4

Which statement correctly describes 802.11 frame aggregation?

Accepted Answer

A-MSDU and A-MPDU bundle multiple frames to reduce per-frame overhead

Answer

A-MSDU (Aggregate MAC Service Data Unit) and A-MPDU (Aggregate MAC Protocol Data Unit) were introduced in 802.11n to bundle frames, reducing header and acknowledgment overhead.

Question 5

What is the purpose of the 802.11k Radio Resource Management (RRM) amendment?

Accepted Answer

Enable STAs to report channel and neighbor AP measurements to aid roaming decisions

Answer

802.11k allows APs to collect radio measurement reports from clients, providing neighbor lists and signal data that help clients make smarter, faster roaming decisions.

CWS Exam Practice Test

CWS Exam Practice Test

CWS CWS 802.11 Standards and Protocols 4