CWNA Technology & Digital Applications 3

Question 1

Which 802.11 power management mode allows a client to sleep for multiple beacon intervals rather than waking every DTIM?

Accepted Answer

WMM Power Save (U-APSD)

Answer

WMM Power Save (U-APSD) allows clients to sleep between service periods and retrieve buffered frames more efficiently than legacy PS-Poll.

Question 2

An enterprise network uses 802.11r to speed up roaming for VoIP handsets. What does 802.11r specifically optimize?

Accepted Answer

The 4-way handshake and key exchange during reassociation

Answer

802.11r (Fast BSS Transition) pre-negotiates security keys before the client roams, reducing reassociation latency from hundreds of milliseconds to under 50ms.

Question 3

In the context of CWNA, what is the primary role of the Distribution System (DS) in a wireless infrastructure network?

Accepted Answer

Connecting APs to each other and to the wired LAN backbone

Answer

The Distribution System (DS) is the wired or wireless medium that interconnects APs and connects the wireless network to the wired LAN infrastructure.

Question 4

Which statement best describes how 802.11k (Radio Resource Management) benefits wireless clients?

Accepted Answer

It provides clients with neighbor AP reports to reduce active scanning time

Answer

802.11k provides clients with neighbor AP lists, allowing them to make informed roaming decisions without scanning every channel, reducing roam decision latency.

Question 5

What is the maximum number of spatial streams supported by 802.11ac Wave 2 for downlink MU-MIMO?

Accepted Answer

8 streams total across clients

Answer

802.11ac Wave 2 DL MU-MIMO supports up to 4 simultaneous spatial streams split across multiple clients, with a maximum of 8 total spatial streams across the AP.

CWNA - Wireless Network Administrator Practice Test

CWNA - Wireless Network Administrator Practice Test

CWNA Technology & Digital Applications 3