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CWNP CWAP-404 Exam Certification Details:

Recommended Training	CWAP self-paced training kit, Training Class
Duration	90 minutes
Exam Price	$275 USD
Exam Code	CWAP-404 CWAP
Passing Score	70%

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CWNP CWAP-404 Reliable Dumps Book | CWAP-404 New Exam Materials

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CWNP Certified Wireless Analysis Professional Sample Questions (Q189-Q194):

NEW QUESTION # 189
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?

A. The missing packets will be shown as CRC errored packets
B. Retransmission are an indication of missing packets
C. Protocol Analyzers show the number of missing packets in their statistics view
D. Look for gaps in the sequence number in MAC headers.

Answer: D

Explanation:
Explanation
One way to confirm if you have missing packets in your packet capture is to look for gaps in the sequence number in MAC headers. The sequence number is a 12-bit field in the MAC header that is used to identify and order data frames within a traffic stream. The sequence number is incremented by one for each new data frame transmitted by a STA, except for retransmissions, fragments, and control frames. The sequence number can range from 0 to 4095, and then wraps around to 0. If you see a jump or a gap in the sequence number between two consecutive data frames from the same STA, it means that you have missed some packets in between. The other options are not correct, as they do not confirm if you have missing packets in your packet capture. CRC errored packets are packets that have been corrupted during transmission and have failed the error detection check. Protocol analyzers may show the number of CRC errored packets in their statistics view, but not the number of missing packets. Retransmissions are an indication of packet loss or collision, but not necessarily of missing packets in your capture. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 5: 802.11 MAC Sublayer, page 114-115

NEW QUESTION # 190
Which one of the these is the most important in the WLAN troubleshooting methodology among those listed?

A. Talk to the end users about their experiences
B. Interview the network manager about the issues being experienced
C. Obtain detailed knowledge of the wireless vendors debug and logging options
D. Observe the problem

Answer: D

Explanation:
Observing the problem is the most important step in the WLAN troubleshooting methodology among those listed. This step involves capturing and analyzing the relevant data from the wireless network, such as packets, frames, spectrum, and performance metrics. Observing the problem helps to verify the existence and scope of the issue, identify the root cause and possible solutions, and validate the results of any actions taken. The other steps are also important, but they are not as critical as observing the problem.

NEW QUESTION # 191
What is the formula used to calculate the Duration field value in an RTS frame?

A. RTS Duration field = CTS duration
B. RTS Duration field = Data or management frame to be sent duration + CTS duration + one ACK duration + three SIFS
C. RTS Duration field = Data or management frame to be sent duration + CTS duration
D. RTS Duration field = Data or management to be sent frame duration

Answer: B

NEW QUESTION # 192
Which statements are true regarding frame acknowledgement in an IEEE 802.11 WLAN? (Choose 3)

A. Data frame fragments are acknowledged individually (with an ACK frame).
B. A client station's Reassociation Request frames are only acknowledged with a Reassociation Response from the access point and not with an ACK frame.
C. 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.
D. 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.
E. In an EDCA BSS, encrypted Data frames are only acknowledged by client stations, never by access points.
F. The RA field of ACK frames is always obtained from the Address 2 field in the corresponding frame being acknowledged.

Answer: A,C,F

NEW QUESTION # 193
Which piece of information Is not transmitted in an HT PDDU header?

A. Channel number
B. PPDU length
C. Number of Spatial Streams
D. MCS index

Answer: A

Explanation:
The channel number is not transmitted in an HT PPDU header. An HT PPDU header is a part of the PPDU that contains information such as modulation, coding, data rate, and number of spatial streams for an 802.11n transmission. The channel number is not included in the HT PPDU header, as it is determined by the frequency band and channel width that are used by the transmitter and receiver. The channel number can be inferred from the frequency band and channel width, which are indicated by bits in different fields of the HT PPDU header, such as HT- SIG and HT-LTF. The other options are not correct, as they are transmitted in an HT PPDU header. The number of spatial streams, PPDU length, and MCS index are indicated by bits in the HT-SIG field of the HT PPDU header.

NEW QUESTION # 194
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