最新のCWNP CWDP-304のPDFと問題集で（2024）無料試験問題解答
あなたを合格させるCWDP Wi-Fi Design CWDP-304試験問題集で2024年03月14日には233問あります
質問 # 13
What two 802.11 amendments deal with regulatory and transmission requirements?
Response:
- A. 802.11h
- B. 802.11d
- C. 802.11k
- D. 802.11f
- E. 802.11i
正解：B、D
質問 # 14
After designing a WLAN infrastructure using predictive design software. What's the best way to validate the predictive design in the physical space before deployment, if time and budget allow for it?
- A. Deploy all of the APs as they're shown in the predictive design and perform an active site survey.
- B. Deploy all of the APs as they're shown in the predictive design and perform a passive site survey.
- C. Perform an AP-on-a-Stick survey using AP locations based upon the predictive design to confirm each AP's placement.
- D. Use a client device positioned where the APs will be installed and measure the signal from the client device.
正解：C
質問 # 15
What is the best method of gathering attenuation measurements from any building materials or objects?
- A. Use the pre-built attenuation values in the predictive design tool.
- B. After measuring the RSSI in free space 1 meter (3 feet) apart, put an AP 0.32 meters (1 feet) away from the wall or object on the other side.
Take measurements and compare the difference. - C. After measuring the RSSI in free space 5 meters (16.5 feet) apart, put an AP 4 meters (13 feet) away from the wall or object on one side and your measuring device 0.67 meters (2 feet) away from the wall or object on the other side. Take measurement and compare the difference.
- D. Look on the Internet for attenuation values for each one of the materials that might attenuate the Wi-Fi signal using the material provider's websites.
正解：C
質問 # 16
What roaming technology uses stored keys at the APs for roam back if a client STA returns after having roamed away?
Response:
- A. SCA roaming
- B. PMK caching
- C. OKC
- D. Preauthentication
正解：B
質問 # 17
What are some common problems with short (12 or fewer characters) ASCII passphrases in WPA/WPA2-Personal networks?
Response:
- A. They only produce a 64-bit PMK instead of a 256-bit PMK.
- B. Very few AP and client vendors support entry of an ASCII-based passphrase.
- C. They are more susceptible to dictionary attacks than longer passphrases.
- D. They lead to weak group keys in a BSS.
正解：C
質問 # 18
What are some advantages of designing guest access with all guest users tunneled directly into the DMZ?
- A. Minimizes configuration requirements for segmentation and filtering of guest traffic across internal LAN
- B. Allows a single SSID with different authentication/encryption models to be used for all WLAN services for corporate users and guests
- C. Enhances performance of web proxy servers in the DMZ for guest Internet traffic
- D. The border firewall configuration will not require any additional rules to pass guest traffic to the DMZ controller
正解：B
質問 # 19
A cable with 2.5 dB of loss is used to measure the return loss of an antenna. The measured value in-band is shown to be larger than 20 dB. What is the actual return loss of the antenna, and is it considered to be a reasonable value?
Response:
- A. Larger than 15 dB and maybe
- B. Larger than 17.5 dB and yes
- C. Larger than 17.5 dB and no
- D. Larger than 15 dB and yes
正解：D
質問 # 20
What advantage provided by 802.11n and 802.11ac is not usable in 1X1:1 low-end client devices?
Response:
- A. Maximal Ratio Combining
- B. Mandatory data rates
- C. MCS data rates
- D. Channel bonding
正解：B
質問 # 21
Your customer's 802.11n laptops are not able to see the SSID in the 5 GHz band in the conference room.
When doing a walkthrough using one of
these laptops, you confirm that it is unable to see the SSID in the 5 GHz band in the conference room. When using your own 802.11 ac laptop, you're able to see the SSID. What is the most likely cause of this problem?
- A. The customer laptop does not support Transmit Beamforming
- B. Their laptops are SISO clients
- C. The AP is configured to use channel 36
- D. The AP is on channel 144
正解：D
質問 # 22
In an RSN requiring low-latency reassociations and no fast secure roaming protocols, what security solutions are ideal for protecting VoWiFi communication?(Choose all that apply.) Response:
- A. 802.1X/EAP
- B. WPA2-Enterprise
- C. WEP
- D. WPA-Personal
- E. WPA2-Personal
正解：B、E
解説：
WPA2-Personal and WPA2-Enterprise are ideal security solutions for protecting VoWiFi communication in an RSN requiring low-latency reassociations and no fast secure roaming protocols. WPA2-Personal uses a pre-shared key (PSK) to authenticate and encrypt the communication between the VoWiFi device and the access point. WPA2-Enterprise uses 802.1X/EAP to authenticate the VoWiFi device and the RADIUS server, and then derives a unique encryption key for each session. Both WPA2-Personal and WPA2-Enterprise use AES-CCMP as the encryption algorithm, which provides strong security and low overhead. WPA2-Personal and WPA2-Enterprise also support key caching andpre-authentication mechanisms, which reduce the latency and disruption during reassociations. These features are essential for maintaining the quality of service and user experience for VoWiFi communication.
WPA-Personal, WEP, and 802.1X/EAP are not ideal security solutions for protecting VoWiFi communication in an RSN requiring low-latency reassociations and no fast secure roaming protocols. WPA-Personal uses TKIP as the encryption algorithm, which is less secure and more computationally intensive than AES-CCMP.
WPA-Personal also does not support key caching and pre-authentication mechanisms, which increase the latency and disruption during reassociations. WEP is an outdated and insecure encryption algorithm that can be easily cracked by attackers. WEP also does not support any authentication or key management mechanisms, which expose the VoWiFi communication to various attacks. 802.1X/EAP is an authentication framework, not a security solution. 802.1X/EAP alone does not provide any encryption or key management for the VoWiFi communication. 802.1X/EAP must be combined with a robust encryption algorithm, such as AES-CCMP, to provide adequate security for VoWiFi communication. References: CWNP, CWDP Certified Wireless Design Professional Official Study Guide, Security Considerations for Voice over Wi-Fi (VoWiFi) Systems, Top 13 VoIP Security Issues and How to Combat Them
質問 # 23
In a convention center, you have received complaints about the WLAN infrastructure. At this moment, the are only two APs in one auditorium. After analyzing the situation, you determined that there are more client devices that the infrastructure was designed for. There are only two APs to support more than 300 devices using the Wi-Fi at the same time. What should you do to make the Wi-Fi work as expected?
- A. Redesign the entire WLAN
- B. Turn up the output power on the APs so that they can handle more clients
- C. Quickly add more APs
- D. Upgrade the Ethernet connections to MultiGig
正解：A
質問 # 24
What statements are true regarding jitter and latency?(Choose all that apply.) Response:
- A. Jitter is a measurement of the variance of the number of frames received from an application for a specific time interval.
- B. Latency is a measurement of the time required to transmit two subsequent frames.
- C. Latency is a measurement of the time delay experienced in the delivery of a frame.
- D. Jitter is a measurement of average latency based on a sample of >100 frames.
- E. Jitter is a measurement of latency variability from one frame to another.
正解：C、E
解説：
Jitter and latency are two important metrics for measuring the quality and performance of wireless networks, especially for real-time applications such as voice and video. Latency is the average time taken for a data packet to reach the destination, while network jitter is the irregularity in latency. When the latency is consistently high, it can mean a slow but stable connection. On the other hand, a high jitter means there may be sporadic disruptions or delays in the transmission, which can affect the quality of service and user experience. Jitter is caused by various factors, such as network congestion, interference, routing changes, hardware issues, or packet prioritization. Jitter can be measured by calculating the difference between the latency of two consecutive packets, or by using the standard deviation of the latency of a sample of packets.
Jitter can be reduced by using Quality of Service (QoS) mechanisms, such as traffic shaping, queuing, or scheduling, which can prioritize the packets based on their importance and sensitivity to delay. Jitter can also be mitigated by using jitter buffers, whichcan store the incoming packets and smooth out the variations in latency before delivering them to the application. References: CWNP, CWDP Certified Wireless Design Professional Official Study Guide, Network Jitter - Common Causes and Best Solutions, Network Jitter vs Latency: What's the Difference and Why Does It Matter, Jitter vs Latency - What's The Difference and Why it Matters
質問 # 25
When deploying a new WLAN infrastructure using PoE to power the APs, you realize that a known good AP is not powering up. You use the same cable to connect your laptop and connect without any trouble. What is the most likely reason the AP did not power up?
- A. Lack of PoE budget on the switch
- B. Missing AP licenses in the controller
- C. Spanning-tree convergence
- D. Layer 3 routing
正解：A
質問 # 26
When preparing a floor plan graphic for use in predictive and manual site surveying, what calibration method will lead to the most accurate and reliable RF data?
- A. Measure the width of an actual office doorway with a tape measure and use this value to calibrate against a doorway graphic.
- B. Use the longest available measurement (like a straight exterior wall) to calibrate the graphic's scale.
- C. Use the known size of a small object, such as a ceiling tile, and use a single instance of this object (e.g. a single ceiling tile) to scale the floor plan.
- D. Calibrate the ceiling height of the floor plan first, then the survey software should be able to auto-calibrate the X and Y planes of the graphic.
正解：B
質問 # 27
What factors are key features when designing a guest network for a large enterprise?(Choose all that apply.) Response:
- A. Traffic tunneling or anchoring
- B. Rate limiting
- C. SSID segmentation
- D. 802.1X security
- E. 802.11n
正解：A、B
質問 # 28
Given: You are evaluating the theoretical and real-world RF gain benefits of transmit and receive features introduced by 802.11 with MIMO. This exercise allows you to quantify the features value in a real-world environment.
What is the maximum theoretical signal gain of chip-based TxBF and MRC (as features) when compared to the same AP using only a single antenna for transmit and receive (effectively simulating a 1x1 chip)?
- A. 2 Rx or Tx chains = 3 dBi gain 3 Rx or Tx chains = approx 5 dBi gain 4 Rx or Tx chains = 6 dBi gain
- B. 2 Rx or Tx chains = 1 dBi gain 3 Rx or Tx chains = 2 dBi gain 4 Rx or Tx chains = 3 dBi gain
- C. 2 Rx or Tx chains = approx 4-6.5 dBi gain 3 Rx or Tx chains = approx 7-10 dBi gain
- D. 2 Rx or Tx chains = 3 dBi gain 3 Rx or Tx chains = 6 dBi gain 4 Rx or Tx chains = 9 dBi gain
正解：C
解説：
The maximum theoretical signal gain of chip-based TxBF and MRC depends on the number of antennas and the channel conditions. TxBF (transmit beamforming) is a technique that focuses the transmitted signal in the direction of the intended receiver, resulting in higher signal strength and less interference. MRC (maximum ratio combining) is a technique that combines the signals received by multiple antennas in an optimal way, resulting in higher signal-to-noise ratio and better performance. The theoretical gain of TxBF and MRC can be calculated as GTxBF=10log10(N) and GMRC=10log10(N) where N is the number of antennas. Therefore, the total gain of TxBF and MRC is Gtotal=GTxBF+GMRC=20log10(N) However, this is the ideal case and assumes perfect channel conditions and alignment. In reality, the gain is lower due to factors such as channel fading, antenna spacing, and feedback delay.According to the CWDP study guide1, the typical gain of TxBF and MRC is about 4-6.5 dBi for 2 antennas, 7-10 dBi for 3 antennas, and 10-13 dBi for 4 antennas.Therefore, the answer is D.References:1: CWDP Certified Wireless Design Professional Official Study Guide: Exam PW0-250, Chapter 8, page 267.
質問 # 29
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CWDP-304問題集はCWDP Wi-Fi Design認証済み試験問題と解答：https://www.goshiken.com/CWNP/CWDP-304-mondaishu.html
CWDP-304無料試験学習ガイド！（更新された233問あります)：https://drive.google.com/open?id=1tTI5FsezOsPJ8lxM3Prs6zeIMulls7dj