CWNA Wireless Network Administrator MCQ 5

Question 1

What is the primary purpose of Dynamic Frequency Selection (DFS) in the 5 GHz band?

Accepted Answer

Detect radar systems and vacate channels used by them

Answer

DFS is an FCC-mandated mechanism requiring 5 GHz devices to detect military and weather radar signals and switch to a radar-free channel within 10 seconds.

Question 2

A CWNA candidate converts 100 mW to dBm. What is the correct value?

Accepted Answer

20 dBm

Answer

dBm = 10 × log10(mW/1 mW); 10 × log10(100) = 10 × 2 = 20 dBm.

Question 3

Which 802.11 QoS access category has the highest priority and is intended for voice traffic under WMM?

Accepted Answer

AC_VO (Voice)

Answer

Under WMM, AC_VO (Voice) has the shortest arbitration inter-frame space and smallest contention window, giving voice traffic the highest channel access priority.

Question 4

What is the function of the RADIUS server in an 802.1X/EAP WLAN deployment?

Accepted Answer

Acts as the authentication server that validates client credentials

Answer

In 802.1X, the RADIUS server is the Authentication Server (AS) that validates the client's EAP credentials and communicates results to the authenticator (AP or WLC).

Question 5

An administrator observes that clients near the AP edge are 'sticky' and refuse to roam to a closer AP. Which client-side mechanism is responsible for this behavior?

Accepted Answer

Client-controlled roaming decisions based on its own RSSI threshold

Answer

Roaming decisions are made by the client, not the AP; many clients have high RSSI thresholds before they initiate roaming, causing them to stay associated to a distant AP.

CWNA - Wireless Network Administrator Practice Test

CWNA - Wireless Network Administrator Practice Test

CWNA Wireless Network Administrator MCQ 5