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>> CWAP-404考試證照 <<

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CWNP CWAP-404 考試大綱：

主題	簡介
主題 1	WLAN Medium Access: The exam evaluates the understanding of a wireless network professional about 802.11 contention algorithms and their impact on WLAN performance. The CWAP-404 exam requires candidates to analyze QoS configurations and operations.
主題 2	MAC Sublayer and Functions: The topic measures the ability of a wireless network professional to understand and analyze the MAC layer operations. Candidates are expected to validate BSS configurations and identify issues like CRC errors and retransmissions, ensuring they can maintain the integrity and performance of the WLAN.
主題 3	PHY Layers and Technologies: In the topic, the CWAP-404 exam tests the understanding of a wireless network professional about the Physical (PHY) layer functions and technologies. Wireless analysts need to describe and apply knowledge of PHY headers, PPDUs, and other PHY-related data. This topic ensures that analysts are proficient in interpreting PHY information within protocol analyzers and can select appropriate capture devices for different PHY types.
主題 4	Spectrum Analysis: The topic assesses the ability of a wireless network professional to capture and interpret RF spectrum data. The exam targets the skills in identifying device signatures and RF issues through spectrum analyzers.

最新的 CWAP Wi-Fi Analysis CWAP-404 免費考試真題 (Q56-Q61):

問題 #56
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. Retransmission are an indication of missing packets
B. Protocol Analyzers show the number of missing packets in their statistics view
C. The missing packets will be shown as CRC errored packets
D. Look for gaps in the sequence number in MAC headers.

答案：D

解題說明：
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

問題 #57
ABC Company is having VoWiFi latency problems on their 802.11g WLAN. A wireless administrator has noticed in the phone's client utilities software that the MAC CRC Error count is higher on stations with problems than on those client stations without problems.
A high MAC CRC Error count is attributable to which of the following? (Choose 3)

A. 2.4 GHz ISM band interference from sources such as wireless video cameras and analog phones
B. High multipath conditions due to an RF environment with highly reflective materials
C. Dynamic Rate Switching algorithms that decrease data rates for latency-sensitive applications
D. Co-located DCF and EDCA access points that are using non-overlapping 2.4 GHz channels
E. High collision rates due to dense population of voice stations and no admission control
F. Two access points with overlapping coverage on a single channel

答案：A,B,E

問題 #58
Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection. The CRC is calculated over what?

A. Mac Header and Frame Body only
B. PHY Header, MAC Header and Frame Body
C. Frame Body only
D. PHY Header and MAC Header only

答案：A

解題說明：
The CRC is calculated over the MAC Header and Frame Body only. The CRC (Cyclic Redundancy Check) is a 32-bit value that is used for error detection in wireless transmissions.
The CRC is calculated over the MAC Header and Frame Body of a PSDU, which are the parts of the data unit that contain information such as source and destination addresses, frame type, frame control, sequence number, payload, etc. The CRC is appended to the end of the PSDU as a FCS (Frame Check Sequence) field. The CRC is not calculated over the PHY Header or PHY Preamble, which are parts of the PPDU that contain information such as modulation, coding, data rate, etc. The PHY Header and PHY Preamble are added or removed by the PHY layer during the conversion between PSDU and PPDU.

問題 #59
What is the purpose of a PHY preamble?

A. It indicates to the PHY the modulation that shall be used for transmission (and reception) of the PSDU.
B. It communicates important information about the PSDU's length, rate, and upper layer protocol- related parameters.
C. It provides the receiver(s) with an opportunity for RF channel synchronization prior to the start of the PLCP header.
D. It provides a cyclic redundancy check (CRC) for the receiving station to validate that the PLCP header was received correctly.

答案：C

問題 #60
Which one of the following statements is not true concerning DTIMs?

A. DTIM stands for Delivery Traffic Indication Map
B. Every Beacon frame must contain a DTIM
C. The DTIM interval can dictate when an STA will wake up to listen to beacon frames
D. Buffered Broadcast and Multicast traffic will be transmitted following a DTIM

答案：B

解題說明：
Every Beacon frame must contain a DTIM is not a true statement concerning DTIMs. DTIM stands for Delivery Traffic Indication Message, and it is a subfield within the TIM (Traffic Indication Map) element in a Beacon frame. The DTIM indicates how many Beacon frames (including the current one) will appear before the next DTIM. For example, if the DTIM interval is set to 3, it means that every third Beacon frame will contain a DTIM. Buffered broadcast and multicast traffic will be transmitted following a DTIM, so that STAs in power save mode can wake up and receive them. The DTIM interval can also dictate when an STA will wake up to listen to Beacon frames, as some STAs may choose to only listen to Beacon frames that contain a DTIM.

問題 #61
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最好的CWAP-404考試證照，令人稱贊的考試指南幫助妳輕松通過CWAP-404考試

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最新的 CWAP Wi-Fi Analysis CWAP-404 免費考試真題 (Q56-Q61):

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