CWAP-405のPDFで合格させるスゴ問題集でCWAP-405最新のリアル試験問題
有効なCWAP-405テスト解答CWAP-405試験PDF問題を試そう
質問 # 13
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?
- A. Retries
- B. Non-Wi-Fi device count
- C. Utilization
- D. The frequency used
正解：D
質問 # 14
Which one of the following should be the first step when troubleshooting a WLAN issue?
- A. Perform an initial WLAN scan and see if any obvious issues stand out
- B. Define the problem
- C. Identify capture locations
- D. Identify probable causes
正解：B
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 problem12 References:
* CWAP-403 Study Guide, Chapter 1: Troubleshooting Methodology, page 7
* CWAP-403 Objectives, Section 1.1: Define the problem
質問 # 15
Given: Adjacent Channel Interference (ACI) can cause frame corruption and poor performance in WLANs.
You are using a protocol analyzer in the attempt to detect ACI.
What should you look for in such a scenario?
- A. Capture on the channel you think may be impacted by ACI and see if any frames are captured from adjacent channels
- B. Look at CRC errors
- C. Look at Retry counts
- D. Look for frames with a low signal strength value in the radio tap header
正解：A
質問 # 16
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 the DHCP server is directly connected to the subnet
- B. When only one AP exists on the subnet
- C. When only one client option 43 value is required
- D. When only one client option 60 value is required
正解：C
解説：
The DHCP server should be configured to provide the IP address information to the APs, but it may also be required to pass information for option 43. Option 43 is a vendor information option and can be used for any vendor purpose. The vendor class identifier (VCI) (for example, "Cisco AP c3600") is used with option 60 to determine the appropriate information to return with option 43.
質問 # 17
Which one of the following is not a valid acknowledgement frame?
- A. Ack
- B. RTS
- C. Block Ack
- D. CTS
正解：B
解説：
RTS is not a valid acknowledgement frame. RTS stands for Request To Send, and it is a control frame that is used to initiate an RTS/CTS exchange before sending a data frame. The purpose of an RTS/CTS exchange is to reserve the medium for a data transmission and avoid collisions with hidden nodes. An acknowledgement frame is a control frame that is used to confirm the successful reception of a data frame or a block of data frames. The valid acknowledgement frames are CTS (Clear To Send), Ack (Acknowledgement), and Block Ack (Block Acknowledgement) . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 186; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 187; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 189; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 190.
質問 # 18
What is an AIFS?
- A. A medium access method introduced by 802.lln, but never implemented
- B. The shortest period of time a STA can sleep
- C. A form of aggregation performed at the PHY layer based on 802.lie UP values interpreted from DSCP values
- D. A variable Interframe Space introduced by 802.lie to help prioritize medium access for different Access Categories
正解：D
解説：
An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An interframe space is a period of time that a STA (station) has to wait before attempting to access the medium. An AIFS is a type of interframe space that varies depending on the AC of the traffic. An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. There are four ACs defined by 802.11e: AC_VO (Voice), AC_VI (Video), AC_BE (Best Effort), and AC_BK (Background). Each AC has a different AIFSN (Arbitration Interframe Space Number) value, which determines how long it has to wait before attempting to access the medium. A lower AIFSN value means a higher priority and a shorter waiting time. The other options are not correct, as they do not describe what an AIFS is. An AIFS is not a medium access method introduced by 802.11n, but never implemented, as it is part of the 802.11e standard and widely used in QoS-enabled WLANs. An AIFS is not a form of aggregation performed at the PHY layer based on 802.11e UP values interpreted from DSCP values, as aggregation is a technique that combines multiple frames into one larger frame to improve efficiency and throughput, not prioritization or medium access. An AIFS is not the shortest period of time a STA can sleep, as sleeping is a power saving mode that allows a STA to conserve battery power by periodically turning off its radio, not accessing the medium. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7:
QoS Analysis, page 194-195
質問 # 19
Finish the statement:
It is possible to distinguish between_______22 MHz transmissions and________20 MHz transmissions when looking at an FFT plot.
- A. HT and VHT
- B. HR/DSSS and ERP
- C. OFDM and HT
- D. ERP and VHT
正解：C
解説：
It is possible to distinguish between OFDM 20 MHz transmissions and HT 20 MHz transmissions when looking at an FFT plot. OFDM and HT are two different modulation schemes used by 802.11 WLANs.
OFDM is used by legacy 802.11a/g devices, while HT is used by newer 802.11n/ac devices. OFDM and HT have different spectral characteristics that can be observed on an FFT plot. OFDM transmissions have a flat spectrum with sharp edges, while HT transmissions have a tapered spectrum with rounded edges. This is because HT uses guard intervals and cyclic prefixes to reduce inter-symbol interference and improve performance. The other options are not correct, as they do not describe different modulation schemes or channel widths that can be distinguished on an FFT plot. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 3: Spectrum Analysis, page 70-71
質問 # 20
Several users have reported WLAN network connection issues and the users connect to the same AP. These users are spread throughout a 320 square meter area. Using a spectrum analyzer, you see RF energy across the entire 2.4 GHz band at significant signal strength levels. The users all connect using either HT or ERP devices.
What is the likely cause of this problem within this area?
- A. Video camera
- B. Bluetooth devices
- C. Wide-band jammer
- D. Microwave oven
正解：C
質問 # 21
Which one of the following statements is not true concerning DTIMs?
- A. The DTIM interval can dictate when an STA will wake up to listen to beacon frames
- B. Buffered Broadcast and Multicast traffic will be transmitted following a DTIM
- C. DTIM stands for Delivery Traffic Indication Map
- D. Every Beacon frame must contain a DTIM
正解：D
解説：
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 . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter
6: MAC Sublayer Frame Exchanges, page 200; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 201.
質問 # 22
Given: Protocol analyzer often have useful graphical dashboards providing information about the health and operations of the WLAN.
What is a valid use of a graph showing the Top APs Based on Active Associations?
- A. Evaluating the capacity handling on a specific channel
- B. Ensuring compliance with corporate security policies
- C. Discovering the total number of client STAs on your network
- D. Locating overloaded APs
正解：D
質問 # 23
How is the length of an AIFS calculated?
- A. SIFS * Slot Time + AIFSN
- B. AIFSN * Slot Time + SIFS
- C. DIFS + SIFS + AIFSN
- D. SIFS + AIFS * Time Unit
正解：B
解説：
The length of an AIFS (Arbitration Interframe Space) is calculated by multiplying the AIFSN (Arbitration Interframe Space Number) by the Slot Time and adding the SIFS (Short Interframe Space). An AIFS is a variable interframe space introduced by 802.11e to help prioritize medium access for different Access Categories (ACs). An AC is a logical queue that corresponds to a QoS (Quality of Service) level for different types of traffic. Each AC has a different AIFSN value, which determines how long it has to wait before attempting to access the medium. A lower AIFSN value means a higher priority and a shorter waiting time.
The Slot Time is a fixed value that depends on the PHY type and channel width. The SIFS is the shortest interframe space that is used for high-priority transmissions, such as ACKs or CTSs. The formula for calculating the AIFS length is: AIFS = AIFSN * Slot Time + SIFS. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 7: QoS Analysis, page 194-195
質問 # 24
The manager in the security group is concerned about compliance with security policies on the WLAN. The budget is not available for a full WIPS SOLUTION. He has asked you to implement a process that will verify compliance.
What would you recommend in such a scenario?
- A. Implement AP-based sensors throughout the facility and then monitor for performance issues with these sensors
- B. Use a laptop-based protocol analyzer that provides compliance reporting to monitor the environment on a periodic basis
- C. Simplify enable 802.11w, which will enforce management frame compliance
- D. Use the built-in spectrum analyzer features of the APs to ensure that WPA2-Enterprise is implemented throughout the organization
正解：B
質問 # 25
What is the function of 802.11 Management frames?
- A. Manage the BSS
- B. Prioritize network administration traffic
- C. Communicate configuration changes between WLAN controller and APs
- D. Manage the flow of data
正解：A
解説：
The function of 802.11 management frames is to manage the BSS. A BSS (Basic Service Set) is a group of STAs (stations) that share a common SSID (Service Set Identifier) and communicate with each other through an AP (access point) or directly in an ad hoc mode. Management frames are one of the three types of 802.11 frames, along with control and data frames. Management frames are used to establish, maintain, and terminate associations between STAs and APs, as well as to advertise and discover BSSs, exchange security information, report errors, and perform other management functions. The other options are not correct, as they are not functions of 802.11 management frames. Prioritizing network administration traffic, communicating configuration changes between WLAN controller and APs, and managing the flow of data are functions of other types of frames or protocols. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 120-121
質問 # 26
When using a commercial WLAN protocol analyzer, you notice that it is listing vendor names for some APs and client STAs.
What is the source of this information?
- A. Banner grabbing
- B. Vendor OUI values
- C. DNS name resolution
- D. Broadcast name resolution
正解：B
質問 # 27
You are troubleshooting VoIP WLAN issues. When performing a PING to a remote device that would be involved in a call link, you see that the time value averages 220 milliseconds.
How much extra delay beyond that recommend for VoIP links is in this link?
- A. There is not enough information because the PING command give round-trip-times
- B. There is 80 milliseconds more delay than recommended
- C. There is 70 milliseconds more delay than recommended
- D. There is no extra delay beyond that recommended, instead there is 80 milliseconds less
正解：D
質問 # 28
A client is operating in an unstable RF environment. Out of five data frames transmitted to the client it only receives four. The client sends a Block Ack to acknowledge the receipt of these four frames but due to frame corruption the Block Ack is not received by the AP. Which frames will be retransmitted'
- A. All data frames
- B. Only the data frame which was corrupted
- C. Only the Block Ack
- D. Both the corrupted data and Block Ack
正解：A
解説：
All data frames will be retransmitted in this scenario. This is because the AP uses a Block Ack (BA) mechanism to acknowledge the receipt of multiple data frames from a client in a single frame. The BA contains a bitmap that indicates which data frames were received correctly and which were not. If the BA is not received by the AP due to frame corruption, the AP will assume that none of the data frames were received by the client and will retransmit all of them. The other options are not correct, as they do not account for the loss of the BA or the use of the bitmap. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 6: 802.11 Frame Exchanges, page 167-168
質問 # 29
You are attempting to determine timing information within a packet capture of a WLAN protocol analyzer.
What time is used to display the time the packet was captured based on the system clock in the computer?
- A. Interframe
- B. Relative
- C. Arrival
- D. Delta
正解：C
解説：
Arrival Time-This is the time that is assigned to a packet after it is processed by the host system. This timestamp is dependent upon the system clock of the computer, and designates when the packet was captured.
質問 # 30
You have implemented centralized, infrastructure-based spectrum analysis. The Aps are configured to perform spectrum analysis in an ad-hoc manner and will go offline as Aps to perform this duty when needed.
What unique method of spectrum analysis monitoring is provided by this solution that is not typically available in a laptop-based analyzer?
- A. Web-based viewing
- B. Band selection
- C. Real-time FFT
- D. RBW adjustments
正解：D
質問 # 31
Where would you look in a packet trace file to identify the configured Minimum Basic Rate (MBR) of a BSS?
- A. In the MBR Action frame
- B. In the MBR Information Element in an Association Response frame
- C. In the Minimum Basic Rate Element in a Beacon frame
- D. Supported Rates & Extended Supported Rates elements in a Beacon frame
正解：D
解説：
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 and Extended 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-405], Chapter 5: 802.11 MAC Sublayer, page 123-124
質問 # 32
You need to determine RF activity over time in a spectrum analyzer. It is to be able to see the activity and the amplitude of that activity.
What kind of view should be used?
- A. Channel listing
- B. Device listing
- C. Swept spectrogram
- D. Real-time FFT
正解：C
解説：
The FFT shows spectral activity in the frequency domain, while waterfall or swept spectrogram views attempt to represent RF activity over time
質問 # 33
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. Adding an 802.11ac module to the existing APs
- B. Replace the antennas with 802.11ac antennas
- C. Converting the 802.11n radio to an 802.11ac radio through software
- D. Simply check the Enable 802.11ac checkbox in the web-based configuration interface
正解：D
質問 # 34
Which piece of information is not transmitted in an HT PPDU header?
- A. PPDU length
- B. Number of Spatial Streams
- C. MCS index
- D. Channel number
正解：D
解説：
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. References: [Wireless Analysis Professional Study Guide CWAP-
405], Chapter 4: 802.11 Physical Layer, page 108-109
質問 # 35
Which one of the following is not an 802.11 Management frame?
- A. PS-Poll
- B. Beacon
- C. Action
- D. Authentication
正解：A
解説：
A PS-Poll (Power Save Poll) frame is not an 802.11 management frame. A PS-Poll frame is a type of control frame that is used by a STA in power save mode to request data frames from an AP. A STA in power save mode can conserve battery power by periodically sleeping and waking up. When a STA sleeps, it cannot receive any data frames from the AP, so it informs the AP of its power save status by setting a bit in its MAC header. The AP then buffers any data frames destined for the sleeping STA until it wakes up. When a STA wakes up, it sends a PS-Poll frame to the AP, indicating its association ID and requesting any buffered data frames. The AP then responds with one or more data frames, followed by an ACK or BA frame from the STA. The other options are not correct, as they are types of 802.11 management frames. An Action frame is used to perform various management actions, such as spectrum management, QoS management, radio measurement, etc. A Beacon frame is used to advertise the presence and capabilities of an AP or BSS. An Authentication frame is used to establish or terminate an authentication relationship between a STA and an AP. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 6: 802.11 Frame Exchanges, page 169-170
質問 # 36
Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an A- MPDU?
- A. A-MPDU flag in the QoS Control Field
- B. The HT Operation Element
- C. A-MPDU flag in the Frame Control Field
- D. The Aggregation flag in the Radio Tap Header
正解：D
解説：
In a protocol analyzer, you would find an indication that a frame was transmitted as part of an A-MPDU by looking at the Aggregation flag in the Radio Tap Header. The Radio Tap Header is a pseudo-header that is added by some wireless capture devices to provide additional information about the physical layer characteristics of a frame. The Aggregation flag is one of the fields in this header, and it indicates whether the frame belongs to an A-MPDU or not. If the flag is set to 1, it means that the frame is part of an A-MPDU; if it is set to 0, it means that the frame is not part of an A-MPDU . References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 9: PHY Layer Frame Formats and Technologies, page 303; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 9: PHY Layer Frame Formats and Technologies, page 304.
質問 # 37
After examining a Beacon frame decode you see the SSID Element has a length of 0. What do you conclude about this frame?
- A. This is a common attack on WISP backend SQL databases
- B. SSID elements always have a length of 0
- C. The frame is corrupted
- D. The beacon is from a BSS configured to hide the SSID
正解：D
解説：
If the SSID element has a length of 0 in a Beacon frame decode, it means that the beacon is from a BSS configured to hide the SSID. The SSID element is a part of the Beacon frame that contains the name or identifier of the BSS. The SSID element has two fields: length and value. The length field indicates how many bytes are used for the value field, which contains the actual SSID string. If the length field is 0, it means that there is no value field or SSID string in the element. This is a common technique used by some APs to hide their SSID from passive scanning clients or potential attackers. However, this technique does not provide much security, as there are other ways to discover or reveal the hidden SSID, such as active scanning or capturing probe response or association frames. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 5: 802.11 MAC Sublayer, page 122-123
質問 # 38
......
CWAP-405問題集はあなたの合格を必ず保証します：https://www.jpntest.com/shiken/CWAP-405-mondaishu
CWAP-405テスト問題集とオンライン試験エンジン：https://drive.google.com/open?id=1zw_PXe22wcK_AtQ3KGeKnn3yjW0UZsCp