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シスコ３００−４２５の認定資格を取得することは、無線ネットワークにおけるキャリアアップを望むＩＴプロフェッショナルにとって貴重な実績です。この認定資格は、企業向け無線ネットワークの設計と展開における専門的な能力の証として、グローバルに認知されています。この資格を持っていることで、候補者は、高性能、信頼性、セキュリティを含む、近代的なビジネスのニーズを満たす無線ネットワークを設計・実装する能力を証明できます。
質問 # 113
An engineer must ensure that the new wireless LAN deployment can support seamless roaming between access points using a standard based on an amendment to the 802.11 protocol. Which protocol must the engineer selects?
- A. 802.11e
- B. 802.11i
- C. 802.11ac
- D. 802.11r
正解：D
解説：
質問 # 114
An engineer is designing a wireless network that will support many different types of wireless clients. When conducting the survey, which client must be used to ensure a consistent experience for all of the wireless clients?
- A. the client that has the highest RF properties
- B. the client with the worst RF characteristics
- C. the client that is used most by the company
- D. the client that is used least by the company
正解：B
解説：
When designing a wireless network for diverse clients, it's crucial to ensure that the network will be reliable for all users. Therefore, surveys should be conducted with the client that has the worst RF characteristics, as indicated in option D. This approach ensures that the network is designed to support even the weakest client, thereby providing a consistent experience for all users.
https://documentation.meraki.com/MR/WiFi_Basics_and_Best_Practices/Conducting_Site_Surveys_with_MR_A
質問 # 115
What is the attenuation value of a human body on a wireless signal?
- A. 6 dB
- B. 4 dB
- C. 12 dB
- D. 3 dB
正解：D
解説：
Signal AttenuationSignal attenuation or signal loss occurs even as the signal passes through air. The loss of signal strength is more pronounced as the signal passes through different objects. A transmit power of 20 mW is equivalent to 13 dBm. Therefore, if the transmitted power at the entry point of a plasterboard wall is at 13 dBm, the signal strength is reduced to 10 dBm when exiting that wall. This table shows the likely loss in signal strength caused by various types of objects.
Signal Attenuation Caused By Various Types of Objects
Object in Signal Path
Signal Attenuation through Object
Plasterboard wall
3 dB
Glass wall with metal frame
6 dB
Cinder block wall
4 dB
Office window
3 dB
Metal door
6 dB
Metal door in brick wall
12 dB
Human body
3 dB
Each site surveyed has different levels of multipath distortion, signal loses, and signal noise. Hospitals are typically the most challenging environment to survey due to high multipath distortion, signal losses and signal noise. Hospitals take longer to survey, require a denser population of access points, and require higher performance standards. Manufacturing and shop floors are the next hardest to survey. These sites generally have metal siding and many metal objects on the floor, which result in reflected signals that recreate multipath distortion. Office buildings and hospitality sites generally have high signal attenuation but a lesser degree of multipath distortion.
https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/71642-vocera-deploy-guide.html
質問 # 116
What is the wireless signal loss of large cases of liquid materials being stored in a warehouse environment?
- A. It is impactful but overall negligible to the RF design.
- B. It is not impactful to the RF design.
- C. It is less than dry goods.
- D. It is higher than dry goods.
正解：D
質問 # 117
A rapidly expanding company has tasked their network engineer with wirelessly connecting a new cubicle area with Cisco workgroup bridges until the wired network is complete. Each of 42 new users has a computer and VoIP phone. How many APs for workgroup bridging must be ordered to keep cost at a minimum while connecting all devices?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
Explanation
So, each AP will have 25 clients. Minimum 4 APs are sufficient.
質問 # 118
An engineer must repurpose a lab WLC appliance for use in the production environment of the enterprise.
After the new WLC is configured with the information of the other WLC, the mobility tunnels are still not coming up. What is the reason?
- A. The hardware platform is incompatible.
- B. The WLC management interfaces are in the same VLAN.
- C. The mobility groups are different.
- D. A firewall is blocking UDP port 16667 between the WLCs.
正解：C
解説：
For mobility tunnels to come up between WLCs, they need to be part of the same mobility group. If they are configured with different mobility groups, the mobility tunnels will not establish, preventing the WLCs from sharing client, AP, and security information.
質問 # 119 
Refer to the exhibit. An enterprise is using wireless as the main network connectivity for clients. To ensure service continuity. a pair of controllers will be installed in a datacentre. An engineer is designing SSO on the pair of controllers. What needs to be included in the design to avoid having the secondary controller go into maintenance mode?
- A. The connection between the redundancy ports is missing.
- B. The Global Configuration of SSO is set to Disabled on the controller.
- C. The redundancy port must be the same subnet as the redundancy mgmt.
- D. The Keep alive timer is too low. which causes synchronization problems.
正解：B
解説：
Explanation
https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-7/High_Availability_DG.html
質問 # 120
A customer has multiple WLCs running in N+1 redundancy with APs load balanced between the WLCs. The customer performs AP failover testing between the WLCs and notices that some of the APs do not move back to their primary WLC after it recovers. What are two points that must be addressed in the design? (Choose two.)
- A. APs do not have their secondary WLC information configured correctly.
- B. APs do not have their primary WLC information configured correctly.
- C. AP Fallback is not enabled on one of the WLCs.
- D. APs failover priorities are set to Low.
- E. DHCP Option 43 information is incorrect.
正解：A、B
質問 # 121
An engineer has deployed a group of APs in an auditorium and notices that the APs are showing high cochannel interference. Which profile can be used to adjust the parameters for these high- density APs?
- A. RF profile
- B. QoS profile
- C. ISE profile
- D. AVC profile
正解：A
解説：
質問 # 122
What is the recommended cell overlap when designing a wireless network for Cisco Hyperlocation?
- A. 50%
- B. 30%
- C. 40%
- D. 20%
正解：D
解説：
Section: Wired and Wireless Infrastructure
質問 # 123
An engineer must decide the cell overlap for a wireless voice deployment.
Which Cisco measurement recommendation should be considered?
- A. One AP should be deployed per 3000 square feet.
- B. The edge of the cell should be below 35 RSSI.
- C. The edge of the cell should be -67 dBm.
- D. The measurement should be done on the 2.4-GHz band.
正解：C
解説：
質問 # 124
A university is in the process of designing a wireless network in an auditorium that seats 500 students and supports student laptops. Which design methodology should the university implement in the auditorium?
- A. roaming design model
- B. location design model
- C. voice design model
- D. high-density design model
正解：D
解説：
https://www.cisco.com/c/dam/en_us/solutions/industries/docs/education/cisco_wlan_design_guide.pdf
質問 # 125
Guest anchoring is configured for a newly created SSID for your company. It has been noticed that the mobility tunnels are not up, and that MPING fails from your foreign WLC to the anchor WLC. What is the reason that it is failing?
- A. A rule is needed at the firewall to allow TCP port 97 for communication to work.
- B. A rule is needed at the firewall to allow UDP port 16666 for communication towork.
- C. A rule is needed at the firewall to allow UDP port 97 for communication to work.
- D. A rule is needed at the firewall to allow TCP port 16666 for communication to work.
正解：B
解説：
Guest anchoring requires mobility tunnels to be established between the foreign and anchor WLCs. For these tunnels to function, the firewall must allow specific ports for communication. UDP port 16666 is the port used for mobility traffic in Cisco wireless networks, and if it is not allowed through the firewall, MPING and mobility tunnels will fail. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide Premium Edition and Practice
質問 # 126
A wireless network consultant must assess an existing wireless LAN controller. Which section must the consultant check before replacing the old APs with APs that are IEEE 802.11ac-capable?
- A. number of AP licenses
- B. controller PSU
- C. software version
- D. throughput capacity
正解：A
解説：
https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9100ax-access-points/nb-06-802-11ax-faq-cte-en.html
質問 # 127
A high-density wireless network is designed. Which Cisco WLC configuration setting must be incorporated in the design to encourage clients to use the 5 GHz spectrum?
- A. Band Select
- B. RRM
- C. Cisco Centralized Key Management
- D. load balancing
正解：A
質問 # 128
A company is in the process of relocating to a new force space and ends out that the Internet circuit will not be ready before the move. The new building has a non-Cisco WLAN to which they can connect. The engineer has a 12-port switch and one Cisco autonomous AP and must connect multiple wired devices. Which additional device is needed to get all clients connected over the workgroup bridge?
- A. hub
- B. transparent firewall
- C. router
- D. wireless controller
正解：C
質問 # 129
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Cisco 300-425 (Designing Cisco Enterprise Wireless Networks) 認定試験は、ワイヤレスネットワーク産業でキャリアを追求したい個人を対象に設計されています。この認定試験は、CCNP Enterprise 認定トラックの一部であり、Cisco テクノロジを使用した高度なワイヤレスネットワークの設計、展開、および管理に必要な知識とスキルを検証することを目的としています。
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