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CWAP-404 Practice Exam Questions and Answers

Certified Wireless Analysis Professional

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Total Questions : 60

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Question # 1

Which one of the following is an advantage of using display filters that is not an advantage of capture-time filters?

Options:

A.  

They allow for focused analysis on just the packets of interest

B.  

Once created they are reusable for later captures

C.  

They only hide the packets from view and the filtered packets can be enabled for view later

D.  

Multiple of them can be applied simultaneously

Discussion 0
Question # 2

You have installed a new 802.1 lac WLAN configured with 80 MHz channels. Users in one area are complaining about poor performance. This area is currently served by a single AP. You take a spectrum analysis capture in the poor performing area. While examining the waterfall plot you notice the airtime utilization is higher on the first 20 MHz of the 80 MHz channel when compared to the rest of the channel. What do you conclude?

Options:

A.  

The AP is misconfigured and needs to be reconfigured to 80 MHz operation

B.  

Non-Wi-Fi interference is preventing the APs 80 MHz operation

C.  

The first 20 MHz is the AP's primary channel and higher airtime utilization on the primary channel is normal when an AP is configured for 80 MHz operation

D.  

RRM is enabled and has dynamically picked a 20 MHz channel

Discussion 0
Question # 3

In which element of a Beacon frame would you look to identity the current HT protection mode in which an AP is operating?

Options:

A.  

HT Protection Element

B.  

HT Operations Element

C.  

ERP Information Element

D.  

HT Capabilities Element

Discussion 0
Question # 4

The PHY layer provides framing by adding a header to create what type of data unit?

Options:

A.  

MPDU

B.  

PSDU

C.  

MSDU

D.  

PPDU

Discussion 0
Question # 5

Which common feature of a Spectrum Analyzer would be the best to help you locate a non-802.11 interference source?

Options:

A.  

Max hold

B.  

Min hold

C.  

Location filter

D.  

Device finder

Discussion 0
Question # 6

What is the function of the PHY layer?

Options:

A.  

Convert PPDUs to PSDUs for transmissions and PSDUs to PPDUs for receptions

B.  

Convert MSDUs to PPDUs for transmissions and PPDUs to MSDUs for receptions

C.  

Convert PPDUs to MSDUs for transmissions and MSDUs to PPDUs for receptions

D.  

Convert PSDUs to PPDUs for transmissions and PPDUs to PSDUs for receptions

Discussion 0
Question # 7

Finish the statement:

It is possible to distinguish between_______22 MHz transmissions and________20 MHz transmissions when looking at an FFT plot.

Options:

A.  

HR/DSSS and ERP

B.  

OFDM and HT

C.  

ERP and VHT

D.  

HT and VHT

Discussion 0
Question # 8

Which one of the following is required for Wi-Fi integration in laptop-based Spectrum Analyzer software in addition to the spectrum analysis adapter?

Options:

A.  

An 802.11 wireless adaptor

B.  

A firmware upgrade for the spectrum analysis adapter

C.  

A directional antenna

D.  

SNMP read credentials to the WLAN controller or APs

Discussion 0
Question # 9

How does a VoIP Phone, using WMM Power Save, request data frames buffered at the AP?

Options:

A.  

The VoIP phone transmits a PS-Poll frame

B.  

The VoIP phone sets the More Data bit in the MAC Header to 1

C.  

The VoIP phone transmits a WMM Action frame

D.  

The VoIP phone transmits a trigger frame, which is a QoS Null frame or a QoS Data frame

Discussion 0
Question # 10

What is encrypted within the third message of the 4-Way Handshake?

Options:

A.  

PMK

B.  

PTK

C.  

GMK

D.  

GTK

Discussion 0
Question # 11

When a data frame is encrypted with WPA2, to which portion of the frame is the encryption applied?

Options:

A.  

Frame body and MAC Header

B.  

Frame body excluding the LLCPDU

C.  

Frame body including the LLCPDU

D.  

The whole MPDU

Discussion 0
Question # 12

Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?

Options:

A.  

Obtain detailed -knowledge of the wireless vendors debug and logging options

B.  

Interview the network manager about the issues being experienced

C.  

Observe the problem

D.  

Talk to the end users about their experiences

Discussion 0
Question # 13

You're the WLAN administrator for a large retailer based at the HQ in New York. The London-based office has been complaining about WLAN disconnections around lunch time each day. You suspect this might be interference from the staff microwave, how might you test your theory from the New York office?

Options:

A.  

Ask a local member of staff to change the frequency of the microwave and see if the disconnections stop

B.  

Ask a local member of staff to take some pictures of the microwave, including some close-ups of the door seal so that you can assess it

C.  

Access the microwave remotely and run a diagnostic check

D.  

Place one of the London APs into spectrum analyzer mode and monitor the situation over lunch time

Discussion 0
Question # 14

You are troubleshooting a client that is experiencing slow WLAN performance. As part of the troubleshooting activity, you start a packet capture on your laptop close to the client device. While analyzing the packets, you suspect that you have not captured all packets transmitted by the client. By analyzing the trace file, how can you confirm if you have missing packets?

Options:

A.  

The missing packets will be shown as CRC errored packets

B.  

Protocol Analyzers show the number of missing packets in their statistics view

C.  

Look for gaps in the sequence number in MAC headers.

D.  

Retransmission are an indication of missing packets

Discussion 0
Question # 15

Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection.

The CRC is calculated over what?

Options:

A.  

Mac Header and Frame Body only

B.  

Frame Body only

C.  

PHY Header, MAC Header and Frame Body

D.  

PHY Header and Mac Header only

Discussion 0
Question # 16

When performing protocol analysis, you capture an 802.1 lac data frame on channel 52, transmitted at MCS 8. At what data rate was the PHY Preamble transmitted?

Options:

A.  

54 Mbps

B.  

86.7 Mbps

C.  

6 Mbps

D.  

78 Mbps

Discussion 0
Question # 17

Which piece of information is not transmitted in an HT PPDU header?

Options:

A.  

Number of Spatial Streams

B.  

PPDU length

C.  

MCS index

D.  

Channel number

Discussion 0
Question # 18

You are analyzing a packet decode of a Probe Request and notice the SSID element has a length of zero. What do you conclude about the transmitting STA?

Options:

A.  

The WLAN adaptor is configured in promiscuous mode

B.  

The STA is operating in Ad-Hoc mode

C.  

The STA's WLAN adaptor is disabled

D.  

The STA is discovering a list of available BSSs

Discussion 0
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