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CWDP-305試験解答 & CWDP-305日本語版受験参考書
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CWDP-305日本語版受験参考書、CWDP-305認定デベロッパー
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CWNP CWDP-305 認定試験の出題範囲:
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CWNP Certified Wireless Design Professional 認定 CWDP-305 試験問題 (Q191-Q196):
質問 # 191
When designing a wireless bridge to connect two offices 13 kilometers (approximately 8 miles) apart, which factor must the Wireless Engineer consider to account for Fresnel Zone clearance?
- A. Earth bulge
- B. Antenna gain
- C. Receive sensitivity
- D. FSPL
正解:A
解説:
When establishing a long-distance wireless bridge, such as one spanning 13 kilometers, it's crucial to consider the Fresnel Zone, which is the elliptical area around the line-of-sight path between two antennas. Obstructions within this zone can cause signal degradation due to diffraction.
One significant factor affecting the Fresnel Zone over long distances is the Earth's curvature, commonly referred to as the Earth bulge. As the distance between the two points increases, the Earth's surface curves away, potentially intruding into the Fresnel Zone and obstructing the signal path. Therefore, engineers must calculate the Earth's bulge and ensure that antenna heights are sufficient to maintain a clear Fresnel Zone.
While Free Space Path Loss (FSPL), antenna gain, and receiver sensitivity are essential parameters in link budget calculations, they do not directly address the physical clearance required in the Fresnel Zone.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Infrastructure Design
質問 # 192
Main Topic:Post-Design ValidationandTroubleshooting
Question:
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?
- A. Larger than 17.5 dB and no
- B. Larger than 15 dB and maybe
- C. Larger than 17.5 dB and yes
- D. Larger than 15 dB and yes
正解:C
解説:
Comprehensive and Detailed Explanation:
Return loss measures how well devices or lines match impedance, with higher values indicating better matching and less signal reflection. When measuring return loss through a cable with known loss, the actual return loss of the antenna is calculated by subtracting twice the cable loss from the measured value:
Measured return loss = 20 dB
Cable loss = 2.5 dB
Actual return loss = 20 dB - (2 × 2.5 dB) = 15 dB
However, since the question states the measured value is "larger than 20 dB," let's assume it's, for example,
22.5 dB:
Actual return loss = 22.5 dB - (2 × 2.5 dB) = 17.5 dB
An actual return loss of17.5 dBis considered acceptable and indicates a reasonably good impedance match, minimizing signal reflections.
Reference:CWDP-305 Study Guide, Chapter on Post-Design Validation - Antenna and Cable Testing.
質問 # 193
You and 10 other people are connected to a public hot-spot. You issue a ping sweep on the network but can't find any devices on the same subnet as yours. What feature might be enabled on the WLAN infrastructure that is preventing you from communicating with other devices on that subnet?
- A. Band steering
- B. OSPF external routes
- C. Load balancing
- D. Peer-to-peer blocking
正解:D
解説:
In public WLAN environments, security and privacy are paramount. To prevent clients from communicating directly with each other, many WLANs implement peer-to-peer blocking (also known as client isolation).
This feature ensures that each client can communicate with the internet but not with other clients on the same network, thereby enhancing security.
The CWDP-305 Official Study and Reference Guide discusses this feature:
"Client isolation prevents wireless clients from communicating directly with each other, which is especially important in public or guest networks to protect user privacy and security." Therefore, the inability to detect other devices on the subnet is likely due to peer-to-peer blocking being enabled on the WLAN infrastructure.
Reference: CWDP-305 Official Study and Reference Guide, Chapter on Post-Design Validation and Troubleshooting
質問 # 194
Which one of the following is an essential metric to measure when performing a survey and design for VoIP across WLANs?
- A. PoE provided to wireless handsets
- B. Throughput rates above 50 Mbps
- C. Data rates above 100 Mbps
- D. Latency
正解:D
解説:
Comprehensive and Detailed Explanation:
Latency is a critical metric when designing WLANs for VoIP (Voice over IP) applications. High latency can result in poor call quality, including delays and echoes. Industry standards recommend that one-way latency should not exceed 150 milliseconds to maintain acceptable voice quality. Therefore, during site surveys and network design, measuring and minimizing latency is essential to ensure a high-quality VoIP experience.
Reference: CWDP-305 Official Study Guide, Chapter on Designing for Specific Applications
質問 # 195
When a WLAN controller sends an 802.11 frame to a lightweight AP for transmission on the wireless medium, how does it mark the frame for
802.11 QoS priority?
- A. The WLAN controller will place the user priority (UP) value in the QoS Control field of the 802.11 frame header before passing it to the lightweight AP.
- B. The WLAN controller does not mark 802.11 frames with priority values only the APs can do this.
- C. The WLAN controller does not mark the 802.11 frames with priority values only the Layer 3 switches can do this.
- D. The WLAN controller does not mark the 802.11 frames with priority values only the Layer 3 routers can do this.
正解:A
質問 # 196
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