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シスコ300-425試験は、サイト調査、ネットワークトポロジー、セキュリティ、トラブルシューティングなど、ワイヤレスネットワークの設計と実装に関連するさまざまなトピックをカバーしています。合格者は、802.11標準、RFテクノロジー、アンテナタイプなどのワイヤレスネットワーク技術について深い理解を示さなければなりません。また、スケーラビリティ、高可用性、冗長性などのネットワーク設計原則に強い理解を持っている必要があります。
認定試験では、ワイヤレスネットワーク設計の原則、サイト調査、RF計画、高密度ワイヤレスネットワーク、セキュリティなど、エンタープライズワイヤレスネットワークの設計に関連する幅広いトピックをカバーしています。この試験は、Cisco Technologiesを使用してワイヤレスネットワークを設計、実装、およびトラブルシューティングする候補者の能力をテストするように設計されています。
質問 # 148
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. controller PSU
- B. software version
- C. number of AP licenses
- D. throughput capacity
正解：B
解説：
Before replacing old APs with IEEE 802.11ac-capable APs, it is crucial to check the software version of the wireless LAN controller. The controller's firmware must support the newer standards and capabilities of 802.11ac APs. An outdated software version may not support the advanced features and performance enhancements offered by 802.11ac technology, leading to compatibility issues and suboptimal network performance.
質問 # 149
An engineer is designing a new wireless network. The network needs to meet these requirements:
- support a high wireless client concentration
- support data over wireless
- support voice over wireless
- avoid interference
Which design approach should be taken?
- A. 2.4 GHz frequency band without channel bonding to support 20 MHz channels
- B. 5 GHz frequency band with channel bonding, to support 80 MHz channels
- C. 5 GHz frequency band with channel bonding, to support 40 MHz channels
- D. 5 GHz frequency band without channel bonding, to support 20 MHz channels
正解：D
解説：
To avoid interference you have to have a higher SNR as possible. While doing Channel bonding you add noise. Besides, high wireless clients concentration demand needs to have a high SNR and to avoid Co-Channel interference. I quote: "One of the hallmarks of a high-performing WLAN is channel reuse. This is the practice of deploying channels in such a manner that they limit the amount if CCI introduced into the environment. The best way to achieve this is by having as many channels to deploy as possible. While a 20MHz channel will not achieve the higher data rates that are advertised with 80MHz, clients can still reach acceptable speeds, allowing you to optimally use each bit of available airtime."
https://www.ekahau.com/blog/channel-planning-best-practices-for-better-wi-fi/
質問 # 150
An engineer must speed up the reauthentication delays that are being experienced on the wireless infrastructure by deploying a key-caching mechanism. Which mechanism must be configured?
- A. PEAP
- B. PMF
- C. FT
- D. GTK-randomization
正解：C
解説：
質問 # 151
An engineer added an AP to a deployment after a post-installation site survey. The engineer then notices an increase in co-channel interference and retransmissions. Which two features help mitigate the issue? (Choose two.)
- A. Transmit Power Control
- B. Coverage Hole Detection
- C. Cisco Compatible Extensions
- D. Enhanced Distributed Channel Access
- E. Dynamic Channel Assignment
正解：A、E
質問 # 152
What causes the most signal attenuation, based on the wireless design tools?
- A. glass wall
- B. office window
- C. metal door
- D. cinder block wall
正解：C
解説：
Metal doors cause the most signal attenuation in wireless design due to the properties of metal reflecting and absorbing radio waves, which can significantly reduce signal strength. Unlike materials such as cinder block or glass, metal can create a complete barrier for the signal, leading to a phenomenon known as "Faraday Cage" effect, where the metallic enclosure blocks electromagnetic fields. References: Designing Cisco Enterprise Wireless Networks (ENWLSD 300-425)
質問 # 153
A customer Wi-Fi deployment is experiencing the sticky client problem and must enable the optimized roaming feature. The wireless clients have valid security credentials for an SSID and can see an AP that offers that SSID to join. What must be configured to enhance roaming?
- A. disable DFS
- B. RSSI threshold
- C. disable 802.11k
- D. enable data rates
正解：B
質問 # 154
An AP is receiving 802.11 packets on its 802.11a radio with an RSSI value of -77 dBm. The current AP is part of an AP group that has been assigned an RF profile with RX-SOP set to Medium for 802.11 a. Which action does the AP take with the packets?
- A. All frames are classified as non-Wi-Fi frames and are not decoded by the 5 GHz radio.
- B. All frames are classified as non-Wi-Fi frames and are not decoded by the 2.4 GHz radio.
- C. Frames are decoded by the 2.4 GHz radio.
- D. Frames are decoded by the 5 GHz radio.
正解：D
質問 # 155
A network engineer is designing a new wireless network. The network needs to have these characteristics:
Which approach should be taken?
- A. Deploy APs near each other for 2.4 GHz coverage, and disable the 5 GHz radios for all APs.
- B. Deploy APs near each other for 5 GHz coverage, and enable the 2.4 GHz radios for all Aps.
- C. Deploy APs near each other for 2.4 GHz coverage, and disable the 5 GHz radios for some APs.
- D. Deploy APs near each other for 5 GHz coverage, and disable the 2A GHz radios for some Aps.
正解：D
解説：
In environments with high client density, deploying APs for 5 GHz coverage is recommended due to the larger number of non-overlapping channels available, which can support higher data rates and client capacity.
Disabling the 2.4 GHz radios on some APs can reduce interference and improve overall network performance.
https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/86/b_Cisco_Wireless_LAN_Controller_Con
質問 # 156
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. A firewall is blocking UDP port 16667 between the WLCs.
- B. The WLC management interfaces are in the same VLAN.
- C. The mobility groups are different.
- D. The hardware platform is incompatible.
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 # 157
A technician connects a Cisco Aironet 3700 Series access point to a switch and realizes that the AP is coming up with 3x3 MIMO. Which reason explains this behavior?
- A. The AP is getting power from a power injector.
- B. A redundant power supply is unavailable on the switch.
- C. The switch is 802.3af capable.
- D. The switch is PoE+ capable.
正解：D
解説：
質問 # 158
A company has 10 access point licenses available on their backup Cisco WLC and their primary Cisco WLC is at full capacity, 5 access points are set to high failover priority and 7 access points are set to critical failover priority. During a failure, not all critical access points failed over to the backup Cisco WLC. Which configuration is the cause of this issue?
- A. network ap-priority is set to disable.
- B. network ap-priority is set to enable.
- C. The critical priority access point count is oversubscribed.
- D. The high priority access point is oversubscribed.
正解：D
解説：
Explanation
https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2016/pdf/BRKCOL-2275.pdf
質問 # 159
An engineer is designing a solution where guests terminate on an anchor controller in the DMZ.
The engineer is having issues and wants to test connectivity between members of a mobility group. Which command must be issued to test whether a mobility control packet is able to be reached over the management interface?
- A. show logging
- B. eping
- C. mping
- D. tracert
正解：C
質問 # 160
A hospital wireless environment was designed with these characteristics:
* RF coverage
* better than -67 dBm in the 5 GHz spectrum
* RRM be used for DCA and TPC in the 2.4 GHz band
* RRM be used for DCA and TPC in the 5 GHz band
After deployment, why do many of the legacy 802.11b/g devices have difficulty maintaining connectivity?
- A. Excessive overlapping channels in the 2.4 GHz band exists.
- B. TPC drastically increases Tx power in the 2.4 GHz band.
- C. Excessive co-channel interference in the 2.4 GHz band exists.
- D. TPC drastically reduces Tx power in the 2.4 GHz band.
正解：D
解説：
The Cisco Aironet 3800 Series APs support mGig, which allows for higher throughput over existing cabling. However, the maximum cable length that supports 5G operation is limited by the quality of the cable and signal attenuation. Category 5e cabling can support 5G operation up to a length of 130 meters, which is within the acceptable range for maintaining the required signal integrity for 5G speeds.
質問 # 161
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. Cisco Centralized Key Management
- C. load balancing
- D. RRM
正解：A
質問 # 162 
Refer to the exhibit. During a post Mesh deployment survey, an engineer notices that frame collisions occur when MAP-1 and MAP-3 talk to RAP-2 Which type of issue does the engineer need to address in the design?
- A. exposed node
- B. hidden node
- C. backhaul latency
- D. co-channel interference
正解：B
解説：
The issue described is indicative of a hidden node problem, where MAP-1 and MAP-3 cannot hear each other's transmissions but can both communicate with RAP-2. This leads to frame collisions as both MAPs may attempt to transmit at the same time, unaware of the other's actions. The design needs to address this by implementing mechanisms such as RTS/CTS or adjusting the placement of the APs to avoid this issue.
https://www.cisco.com/en/US/docs/solutions/Enterprise/Mobility/emob30dg/WiMesh.pdf
質問 # 163
An architect configures a set of AirOS controllers to be in the same mobility group as the existing controllers.
The implementation should facilitate inter-controller roaming for users in their new campus. After the configuration, the mobility tunnel is not operational for the data path in the network. Which two validations should be performed? (Choose two.)
- A. firewall IP protocol 97
- B. firewall port 16666
- C. mapping
- D. rping
- E. mepping
正解：A、B
解説：
When the mobility tunnel is not operational for the data path, it is essential to validate the network's firewall settings. Firewall port 16666 must be open to allow mobility control messages to pass through, and firewall IP protocol 97 (EtherIP) must be permitted to enable the encapsulation of IP within IP, which is necessary for the data path of the mobility tunnel. Ensuring these firewall settings are correctly configured is critical for facilitating inter-controller roaming and operational mobility tunnels.
質問 # 164
An engineer designs a new wireless network that uses a Cisco Catalyst 9800 Series wireless controller. The controller must be in a DMZ. The internal network is to be at the main on-premises data center of the customer. In addition, the customer wants to establish an EoIP tunnel to a Cisco 5520 WLC that is in a regional force. How must this requirement be incorporated into the design?
- A. Use Cisco IOS-XE code that supports encryption of the control plane on the Catalyst 9800 WLC.
- B. Use AirOS code that supports encryption of the data plane on the 5520 WLC.
- C. Use Cisco IOS-XE code that supports encryption of the data plane on the Catalyst 9800 WLC.
- D. Use AirOS code that supports encryption of the control plane on the 5520 WLC.
正解：D
質問 # 165
An engineer must deploy a wireless network in an open-plan environment that has three SSIDs using the 5 GHz band set to 40 MHz. Co-channel interference must be reduced. Which two actions must be taken?
(Choose two.)
- A. Decrease channel bonding in the 5 GHz band to 20 MHz.
- B. Disable band steering.
- C. Reduce the power of the AP.
- D. Increase the number of SSIDs.
- E. Increase channel bonding in the 2.4 GHz band to 40 MHz.
正解：A、C
解説：
To reduce co-channel interference, it's beneficial to decrease channel bonding, which will increase the number of non-overlapping channels available. Reducing the power of the APs can also help minimize interference by reducing the range of each AP's signal, thereby reducing the chance of overlap.
質問 # 166
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