Free CWNA Wireless Network Administrator General Information Questions and Answers

Question 1

Which of the following is accurate about IEEE 802.11 WLANs' use of the Orthogonal Frequency Division Multiplexing (OFDM) modulation method?

Accepted Answer

OFDM modulation is used only in 5 GHz 802. 11 transmissions.

Answer

The ERP, HT, and VHT PHYs use OFDM, which was initially introduced in 802. 11a.

Answer

BPSK modulation is used in OFDM to provide data speeds of up to 7 Gbps.

Answer

Frequency-hopping spread spectrum (FHSS) PHY devices employed OFDM.

Question 2

A 3x3:2 AP, AP-1. a 3x3:3 client, STA-3. How many spatial streams can be used simultaneously for an HT-OFDM downlink broadcast from AP-1 to STA-3?

Accepted Answer

Two spatial streams, because the definition of the AP indicates that it is capable of only two spatial streams.

Answer

Three spatial streams, as the AP can only support three spatial streams, according to its definition.

Answer

Three spatial streams, as the client's definition states that this is the maximum number of spatial streams it can support.

Answer

One spatial stream, as the AP's definition specifies it can only support one spatial stream.

Question 3

You are responsible for establishing a wireless connection between two structures on a single campus.
The link must support at least 150 Mbps of data rates.
Which WLAN technology role ought to be implemented?

Accepted Answer

IBSS

Answer

WPAN

Answer

Wireless bridging

Answer

Access BSS

Question 4

What 802.11 PHY uses the very low-frequency bands that aren't currently being used by broadcast video signals?

Accepted Answer

DSSS

Answer

SIG

Answer

TVHT

Answer

DMG

Question 5

It detects 2.4-GHz APs but not even 5-GHz APs. You discover when analyzing the problem that this issue affects every laptop of this model in the company. In the same workspaces, several other tablets connect on channels 48 and 52. What is the most likely issue?

Accepted Answer

The antennas in the laptops have insufficient gain to detect the 5 GHz signals.

Answer

The clients are set up to use WPA and only WPA2 is supported on 5 GHz channels.

Answer

The client drivers need to be updated because they are broken.

Answer

The access points are set up to forbid 5 GHz.

Question 6

What information should be included in a post-deployment site survey report in addition to the findings of the coverage study to guarantee that WLAN users receive appropriate performance?

Accepted Answer

Capacity analysis results

Answer

WAN interface analysts results

Answer

Layer 4 protocol availability analysis results

Answer

Application Layer protocol availability analysis results

Question 7

About 40 miles from the reaction team's headquarters, a distant area has experienced a natural calamity. The response team must set up a local wireless network using 802.11 WLAN access points. Which of the listed approaches is the most effective for implementing network backhaul for Internet communications in this situation?

Accepted Answer

Cellular/LTE

Answer

Temporary wired cable

Answer

Temporary wired DSL

Answer

802.11 bridging