Verified CWAP-404 &As – Provide CWAP-404 with Correct Answers [Q55-Q73]

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Verified CWAP-404 Exam Dumps Q&As – Provide CWAP-404 with Correct Answers

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CWNP CWAP-404 Exam Certification Details:

Recommended Training	CWAP self-paced training kit, Training Class
Sample Questions	CWNP CWAP-404 Sample Questions
Passing Score	70%
Exam Code	CWAP-404 CWAP
Number of Questions	60

Q55. To what data rates can a 5 GHz PHY device shift when changers occur in the signal strength?

11, 5.5, 2, 1

24, 18, 12, 5.5

24, 18, 11, 2

24, 18, 12, 6

Q56. Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?

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

Interview the network manager about the issues being experienced

Observe the problem

Talk to the end users about their experiences

Q57. According to the 802.11n-2009 amendment, what security requirement is specified for HT BSSs?

In an RSN, HT stations may not communicate with one another using TKIP.

TKIP cannot be supported in an HT BSS.

All unicast traffic transmitted by an HT station and destined to an HT station must use AES- CCMP.

HT BSSs are prevented from supporting WEP.

HT BSSs must mandatorily support 802.11r FT.

Q58. What two IEEE 802.11 entities may be used to separate successful transmissions within an EDCA TXOP? (Choose 2)

SIFS

AIFS

ACK

CAP

PIFS

EIFS

RIFS

Q59. Which statements are true regarding frame acknowledgement in an IEEE 802.11 WLAN? (Choose 3)

Following non-QoS Data frames with the More Fragments bit set to 1, the Duration/ID field of the ACK frame is set to a value equal to two SIFS plus the next Data fragment and its ACK.

A client station’s Reassociation Request frames are only acknowledged with a Reassociation Response from the access point and not with an ACK frame.

Probe request acknowledgement (sending of a Probe Response frame) is configurable in the access point and is always linked to SSID broadcast configuration in Beacons.

In an EDCA BSS, encrypted Data frames are only acknowledged by client stations, never by access points.

Data frame fragments are acknowledged individually (with an ACK frame).

The RA field of ACK frames is always obtained from the Address 2 field in the corresponding frame being acknowledged.

Q60. Which one of the following is required for Wi-Fi integration in laptop-based Spectrum Analyzer software?

A supported WLAN adaptor with a customized driver

Any 802.11 wireless adaptor

A dual radio spectrum analyzer card

SNMP read credentials to the WLAN controller or APs

Q61. When would you expect to see a Reassociation Request frame?

Every time a STA associates to an AP to which it has previously been associated

Only when a STA is using FT roaming

Only when a STA roams back to an AP it has previously been associated with

Every time a STA roams

Q62. How is the length of an AIFS calculated?

DIFS + SIFS + AIFSN

SIFS + AIFS * Time Unit

SIFS * Slot Time + AIFSN

AIFSN * Slot Time + SIFS

Q63. As the WLAN engineer in your organization, you must troubleshoot performance problems related to co- channel interference (CCI).
What is a good measurement of CCI impact in addition to the number of APs seen on a channel?

The frequency used

Non-Wi-Fi device count

Retries

Utilization

Q64. How long, in microseconds, is the required Slot Time that is announced by an AP in an HT BSS when HR/DSSS, ERP-OFDM, and HT-OFDM client stations are associated to the AP?

2 μs

4 μs

9 μs

10 μs

20 μs

Q65. What does the value of the Listen Interval field in an Association request frame indicate?

How long a STA performing active scanning will listen for Probe Responses before changing channels

How often a STA will go off channel to look for other BSSs

How often a STA in power save mode wakes up to listen to Beacon frames

How long a STA waits for an Ack before retransmitting the frame

Q66. ABC International has installed a new smart ZigBee controlled lighting system. However, the network team is concerned that this new system will interfere with the existing WLAN and has asked you to investigate the impact of the two systems operating simultaneously in the 2.4 GHz band. When performing Spectrum Analysis, which question could you answer by looking at the FFT plot?

Do the ZigBee channels used by the lighting system overlap with the WLAN channels?

Is the ZigBee system using more than 50% of the available airtime?

Is the WLAN corrupting ZigBee system messages?

Is the ZigBee system causing an increase in WLAN retries?

Q67. Many access points support IEEE 802.1Q VLAN tagging. When analyzing a WLAN system using IEEE 802.1Q tags, where can the VLAN tag number be seen?

In the Sequence Control field of the MSDU

In the PLCP header’s Service field

In the Frame Control field of the MPDU header

In the Ethernet header on the wired port of the access point

In the Beacon Management frame’s Capabilities fixed field

Q68. Which statement accurately describes IEEE 802.11 Power Save operation in a Basic Service Set that does not support the QoS facility?

Following a period of time in a low power state, client stations wake themselves and automatically poll the access point for traffic using a PS-Poll frame.

When the access point’s buffer is full, the access point wakes all client stations using a PS-Poll frame so that they can receive the data.

Upon receiving traffic for a dozing station, the access point wakes the client station using a PS- Poll frame so that the client station can receive the data.

After waking from a low power state, client stations listen for the next Beacon to determine if sending a PS-Poll frame to the access point is necessary.

After waking at a scheduled TBTT, client stations send Null Function frames to the access point with the Power Management bit set back to zero.

Q69. Given: The graphic is taken from a spectrum analyzer.

What types of RF transmitters are illustrated?

An IEEE 802.11 HR/DSSS security camera on channel 6 and an RFID tag

A Bluetooth headset and a narrowband RF jamming device

A 2.4 GHz cordless phone and an OpenAir FHSS system

A 20 MHz HT IEEE 802.11 system using channel 1 and a microwave oven

Q70. Which one of the following portions of information is communicated in the PHY Header?

Signal strength

Date rate

SNR

Noise

Q71. ABC Company’s WLAN administrator is getting complaints from one user that his WLAN throughput is sluggish compared to other users in his area. The administrator takes his diagnostics laptop, which has a wireless protocol analyzer installed, to the area where the complaining user works. The administrator uses the PING utility to test connectivity from the complaining user’s wireless client station to another wireless client station across the closest access point, while capturing the wireless frames.
The administrator sees what is displayed in this screenshot.

From this screenshot, which statements can you conclude to be TRUE that are related to the complaining user’s throughput problem? (Choose 2)

The complaining user’s WLAN client utilities are configured with a small fragmentation threshold.

The complaining user’s station is retransmitting fragments many times likely due to nearby RF interference.

The access point and other stations are using ERP-OFDM modulation, and the complaining user’s wireless client station is using HR/DSSS modulation.

The complaining user’s wireless client station should be using RTS/CTS as a protection mechanism, but it is not.

The access point is not signaling for protection (Protection = no) in the Beacons, but it should be.

Q72. You are performing a multiple adapter channel aggregation capture to troubleshoot a VoIP roaming problem and would like to measure the roaming time from the last VoIP packet sent on the old AP’s channel to the first VoIP packet sent on the new AP’s channel. Which timing column in the packet view would measure this for you?

Roaming

Relative

Absolute

Delta

Q73. VoIP is used heavily in your organization.
You must troubleshoot problems with dropped calls on the WLAN.
What is a common cause of dropped calls when using Wi-Fi VoIP phones?

Use of WMM

Data rates below 54 Mbps

Data rates below 75 Mbps

Slow roaming

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