[2025年05月21日] 最新CWAP-404のPDF問題集リアル無料テスト本日更新です
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質問 # 17
Where would you look in a packet trace file to identify the configured Minimum Basic Rate (MBR) of a BSS?
- A. In the Minimum Basic Rate Element in a Beacon frame
- B. In the MBR Information Element in an Association Response frame
- C. In the MBR Action frame
- D. Supported Rates & Extended Supported Rates elements in a Beacon frame
正解：D
解説：
Explanation
The configured Minimum Basic Rate (MBR) of a BSS can be identified by looking at the Supported Rates and Extended Supported Rates elements in a Beacon frame. A Beacon frame is a type of management frame that is transmitted by an AP to advertise its presence and capabilities to potential clients. A Beacon frame contains various information elements (IEs) that provide details about the BSS configuration and operation. The Supported Rates andExtended Supported Rates IEs list the data rates that are supported by the AP for data transmission. The MBR is the lowest data rate among these supported rates that is required for all clients to join and communicate with the BSS. The MBR is usually marked with a flag bit in these IEs to indicate its mandatory status. The other options are not correct, as they do not exist or do not indicate the MBR of a BSS. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 5: 802.11 MAC Sublayer, page 123-124
質問 # 18
What IEEE 802.11 technology is illustrated by the exhibit?
- A. Fragmentation
- B. U-APSD
- C. A-MSDU
- D. Jumbo frames
- E. TCP Fragment Bursting
- F. A-MPDU
正解：C
質問 # 19
What is the Extended IFS used in 802.11 contention?
- A. When the higher data rates are used and you want the fastest medium access times
- B. When the lower data rates are used and you want the fastest medium access times
- C. When 802.11ac must coexist with 802.11n
- D. When a frame reception begins but the received frame is incomplete or corrupted based on the FCS
正解：C
質問 # 20
When a data frame is encrypted with WPA2, to which portion of the frame is the encryption applied?
- A. Frame body and MAC Header
- B. Frame body including the LLCPDU
- C. Frame body excluding the LLCPDU
- D. The whole MPDU
正解：B
解説：
Explanation
When a data frame is encrypted with WPA2, the encryption is applied to the frame body including the LLCPDU. The LLCPDU (Logical Link Control Protocol Data Unit) is a part of the frame body that contains information such as protocol type, source and destination service access points (SAPs), and control fields. The LLCPDU is added by the LLC (Logical Link Control) sublayer to provide multiplexing and flow control functions for different upper layer protocols. When a data frame is encrypted with WPA2, which uses AES-CCMP as its encryption algorithm, both the payload and the LLCPDU are encrypted as a single unit. The MAC header and FCS are not encrypted, as they are needed for addressing and error detection purposes. References: [Wireless Analysis Professional Study Guide CWAP-404], Chapter 5: 802.11 MAC Sublayer, page 115-116
質問 # 21
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?
- A. 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 access it
- B. Access the microwave remotely and run a diagnostic check
- C. Ask a local member of staff to change the frequency of the microwave and see if the disconnections stop
- D. Place one of the London APs into spectrum analyzer mode and monitor the situation over lunch time
正解：D
解説：
The best way to test the theory of microwave interference from the New York office is to use a remote spectrum analyzer. By placing one of the London APs into spectrum analyzer mode, you can capture and analyze the RF spectrum in the London office over lunch time. You can then look for any signs of microwave interference, such as high duty cycle, high amplitude, or frequency hopping on the 2.4 GHz band. This method does not require any physical access to the microwave or any changes to its frequency.
質問 # 22
Which one of the following is an advantage of using display filters that is not an advantage of capture-time filters?
- 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
正解：C
解説：
Display filters are applied after the capture is completed and they only hide the packets from view. The filtered packets are still present in the capture file and can be enabled for view later by changing or removing the display filter. This is an advantage over capture-time filters, which discard the packets that do not match the filter criteria and cannot be recovered later.
質問 # 23
You are troubleshooting problems with DHCP in relation to lightweight APs. They vendor class identifier (VCI) is not specified in the DHCP server. When you contact vendor support, they inform you that it is not necessary.
When is this information true?
- A. When only one client option 60 value is required
- B. When only one client option 43 value is required
- C. When the DHCP server is directly connected to the subnet
- D. When only one AP exists on the subnet
正解：B
質問 # 24
You have been asked to recommend a protocol analysis solution that uses open source software and works with the Linux platform. It must provide decoding of 802.11ac frames and minimal support for reporting and statistics.
What solution would you recommend?
- A. Wireshark
- B. CommView for Wi-Fi
- C. Wi-Fi Analyzer Pro
- D. OmniPeek
正解：A
質問 # 25
Which statements are true regarding Beacons from an AP in an HT infrastructure BSS that is configured with multiple WLAN profiles? (Choose 3)
- A. The BSSID and Source Address are always the same.
- B. The Beacon interval must be the same for all WLANs (SSIDs) supported by a single AP
- C. When the SSID is "hidden," the ESS subfield of the Capability Information field distinguishes one BSS from another.
- D. Beacons can be disabled for security purposes.
- E. The Receiver address and the BSSID are always the same.
- F. The Destination Address is always FF:FF:FF:FF:FF:FF.
- G. All Beacons generated by APs contain a TIM information element.
正解：A、F、G
質問 # 26
You work as an SE for a value-added reseller. A client has an existing deployment of 802.11n Aps and wants to upgrade several BSSs to 802.11ac.
What hardware feature of some enterprise Aps may allow for this without a forklift upgrade?
- A. Replace the antennas with 802.11ac antennas
- B. Simply check the Enable 802.11ac checkbox in the web-based configuration interface
- C. Adding an 802.11ac module to the existing APs
- D. Converting the 802.11n radio to an 802.11ac radio through software
正解：C
質問 # 27
What element was added to the general frame of 802.11 with the 802.11e amendment and the
802.11- 2007 rollup?
- A. Address 4
- B. HT Control
- C. RSN-IE
- D. QoS Control
正解：D
質問 # 28
Why would a STA that supports 802.11k Radio Measurement send a Neighbor Request to an AP?
- A. To request a list of neighboring STAs which enables the STA to better pick the right protection mechanisms
- B. To inform the current AP about the STA's intent to roam to a neighboring AP, ensuring a seamless handover
- C. To request a list of neighboring APs which the STA can use as roaming candidates
- D. To learn about neighboring interference sources and tune its RF radio accordingly
正解：C
解説：
A STA that supports 802.11k Radio Measurement would send a Neighbor Request to an AP to request a list of neighboring APs which the STA can use as roaming candidates. A Neighbor Request is an Action frame that contains a subelement specifying the type of information that the STA wants to receive from the AP. A Neighbor Report is an Action frame that contains a subelement with a list of neighboring APs that match the criteria specified in the Neighbor Request. The Neighbor Report provides information such as BSSID, channel, operating class, and PHY type of each neighboring AP. This information helps the STA to perform intelligent roaming decisions based on signal quality, load, and compatibility.
質問 # 29
Which one of the following should be the first step when troubleshooting a WLAN issue?
- A. Identify probable causes
- B. Identify capture locations
- C. Perform an initial WLAN scan and see if any obvious issues stand out
- D. Define the problem
正解：D
解説：
The first step in any troubleshooting process is to define the problem. This involves gathering information from various sources, such as users, network administrators, network documentation, and network monitoring tools. Defining the problem helps to narrow down the scope of the issue and identify the symptoms, causes, and effects of the problem.
質問 # 30
A new firmware has been released for the AP model you use in your WLAN.
You have more than 120 of these APs installed.
What is a good reason for applying a firmware update on an enterprise AP?
- A. Enable the short guard interval
- B. Enable new security features and patch vulnerabilities
- C. Enable 4x4:4 spatial streams on a 3x3:3 AP
- D. Disable lower data rates
正解：B
質問 # 31
WMM-PS trigger frames can be what type of IEEE 802.11 frames? (Choose 2)
- A. QoS Null
- B. CTS
- C. Reassociation
- D. PS-Poll
- E. QoS Data
- F. QoS Action
正解：A、E
質問 # 32
What is the function of the PHY Preamble?
- A. To terminate a conversation between transmitter and receiver
- B. Carries the NDP used in Transmit Beamforming and MU-MIMO
- C. To set the modulation method for the MPDU
- D. Allows the receiver to detect and synchronize with the signal
正解：D
解説：
The function of the PHY preamble is to allow the receiver to detect and synchronize with the signal. The PHY preamble is a part of the PPDU that is transmitted before the PHY header and the PSDU. The PHY preamble consists of a series of training fields that help the receiver to adjust its parameters, such as frequency, timing, and gain, to match the incoming signal. The PHY preamble also helps the receiver to estimate the channel conditions and noise level.
質問 # 33
Which statements are true regarding wireless network discovery and scanning processes for an HT network? (Choose 2)
- A. Client stations send Probe Request frames on all HT channels in the 2.4 GHz ISM band in a consecutive manner until they receive at least 3 Probe Response frames.
- B. Client stations may continually send Probe Request frames on all HT channels in the 2.4 GHz ISM band in a consecutive manner, regardless of their association state.
- C. Access points send Beacon frames on all HT channels in the 2.4 GHz ISM band in a consecutive manner including the channel for which the access point is configured.
- D. Client stations send Probe Request frames on all HT channels in the 2.4 GHz ISM band in a consecutive manner until they associate with an access point. After associating to an access point, they no longer transmit Probe Request frames.
- E. Access points send Beacon frames only on the HT channel in the 2.4 GHz ISM band for which the access point is configured, and only after scanning that channel to discover existing BSSs.
正解：B、E
質問 # 34
What HT PPDU format is shown in the exhibit?
- A. HT-greenfield format
- B. Dual Training Field format
- C. ERP-OFDM format
- D. Non-HT format
- E. Non-HT duplicate format
- F. HT-mixed format
正解：F
質問 # 35
Which one of the following is required for Wi-Fi integration in laptop-based Spectrum Analyzer software in addition to the spectrum analysis adapter?
- A. A firmware upgrade for the spectrum analysis adapter
- B. An 802.11 wireless adaptor
- C. A directional antenna
- D. SNMP read credentials to the WLAN controller or APs
正解：B
解説：
Explanation
An 802.11 wireless adaptor is required for Wi-Fi integration in laptop-based spectrum analyzer software in addition to the spectrum analysis adapter. The spectrum analysis adapter is a hardware device that captures the RF signals in the wireless environment and sends them to the spectrum analyzer software for analysis and display. The 802.11 wireless adapter is a hardware device that connects the laptop to the wireless network and allows the spectrum analyzer software to correlate the RF data with the Wi-Fi data, such as SSID, channel, and BSSID. This enables the spectrum analyzer software to provide more context and insight into the spectrum activity and its impact on the Wi-Fi network. A firmware upgrade for the spectrum analysis adapter is not required for Wi-Fi integration, but it may be needed to fix bugs or add features to the device. A directional antenna is an antenna that focuses the RF energy in a specific direction and has a high gain and a narrow beamwidth. A directional antenna can be used with a spectrum analysis adapter to pinpoint the location or source of interference or noise in the wireless environment, but it is not required for Wi-Fi integration. SNMP read credentials to the WLAN controller or APs are not required for Wi-Fi integration, but they may be useful for obtaining additional information about the wireless network configuration and performance from the network devices.References:
CWAP-404 Study Guide, Chapter 4: Spectrum Analysis and Troubleshooting, page 123 CWAP-404 Objectives, Section 4.2: Integrate Wi-Fi data with spectrum analysis data CWAP-404 Study Guide, Chapter 4: Spectrum Analysis and Troubleshooting, page 131
質問 # 36
Protocol analyzers may present field values in either binary, decimal or hexadecimal. What precedes a hexadecimal value to indicate it is hexadecimal?
- A. HEX
- B. 0x
- C. %
- D. 16x
正解：B
解説：
A hexadecimal value is a value that uses base 16 notation, which means it can have digits from 0 to 9 and letters from A to F.
A hexadecimal value is usually preceded by 0x to indicate that it is hexadecimal and not decimal or binary.
For example, 0x0A is hexadecimal for 10 in decimal or 00001010 in binary. The other options are not valid prefixes for hexadecimal values.
質問 # 37
You require 802.11ac capture solution.
You want to capture using native operating system tools if possible.
What operating system has built-in ability to capture 802.11ac frames assuming it is running on the appropriate laptop hardware?
- A. Windows 8.1
- B. Mac OS X
- C. Windows 10
- D. Windows 7
正解：B
質問 # 38
You have been recently hired as the wireless network administrator for an organization spread across seven locations. They have deployed more than 100 APs, but they have not been managed in either an automated or manual process for more than 18 months.
Given this length of time, what is one of the first things you should evaluate from a support perspective?
- A. The VLANs in use
- B. The channels in use
- C. The data rates allowed
- D. The firmware revision
正解：D
質問 # 39
In the analyzer trace shown, the TBTT is nominally 102.5 milliseconds.
Why does the Beacon transmission interval vary?
- A. This trace shows an HT network where HR/DSSS nodes are active on the network. The access point is changing slot times from short to long as needed.
- B. The DCF Interframe space (DIFS) is nominally 50 ms, but typically varies by as much as 10 ms, which causes delays in Beacons.
- C. The access point must arbitrate to gain access to the RF medium in order to transmit a Beacon.
- D. Beacon frames vary in size, and therefore some take slightly longer to send than others.
正解：C
質問 # 40
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