CWNA Wireless Network Administrator MCQ 2

Question 1

Which 802.11 amendment introduced OFDMA as a key technology to improve multi-user efficiency in dense environments?

Accepted Answer

802.11ax

Answer

802.11ax (Wi-Fi 6) introduced OFDMA, allowing the channel to be divided into smaller resource units shared among multiple clients simultaneously.

Question 2

A wireless engineer needs to reduce co-channel interference on a 2.4 GHz network. Which set of non-overlapping channels should be used?

Accepted Answer

1, 6, 11

Answer

In the 2.4 GHz band (US regulatory domain), channels 1, 6, and 11 are the only three non-overlapping 20 MHz channels.

Question 3

What is the primary function of the Distribution System (DS) in an 802.11 BSS architecture?

Accepted Answer

Connects multiple APs to form an ESS

Answer

The Distribution System interconnects multiple APs and their BSSs to form an Extended Service Set (ESS), typically using a wired backbone.

Question 4

Which EAP method uses a server-side certificate only and generates dynamic session keys via a TLS tunnel?

Accepted Answer

EAP-TTLS

Answer

EAP-TTLS requires only a server-side certificate to create a TLS tunnel, inside which legacy authentication methods run to authenticate the client.

Question 5

A CWNA candidate measures a received signal of -65 dBm and a noise floor of -90 dBm. What is the SNR?

Accepted Answer

25 dB

Answer

SNR = Signal – Noise = -65 dBm – (-90 dBm) = 25 dB.

CWNA - Wireless Network Administrator Practice Test