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問題 #25 
Refer to the exhibit. An engineer is configuring a switch port for a Cisco Spaces deployment at a new branch site. The Spaces connector requires access to the management VLAN 30. The network team plans to add more analytics services in the future, so the configuration must also allow for easy scalability and avoid service interruption for currently connected devices and default switch VLAN settings. Which set of commands must be added to the box in the CLI to complete the configuration?
答案：A
解題說明：
The correct answer is D. Cisco Spaces connector deployments often require a VLAN on which the connector is reachable for management or data, and Cisco Spaces wired gateway guidance identifies the connector VLAN as the VLAN used for communication to the connector. The same guidance also supports multiple source VLANs for monitored wired devices, which aligns with the requirement for future analytics-service scalability.
A trunk port is the proper design choice because it can carry multiple VLANs over the same physical interface. Cisco Catalyst switch documentation states that an access port carries traffic for only one VLAN, while an IEEE 802.1Q trunk carries multiple VLANs and supports tagged traffic. The command switchport trunk allowed vlan 30 limits the trunk initially to VLAN 30, satisfying the current management VLAN requirement without changing the native VLAN or other default VLAN settings. Cisco also documents that an allowed VLAN list limits VLAN membership only on the associated trunk port, so it does not affect other switch ports.
Option A works only for a single untagged VLAN and is less scalable. Options B and C mix access mode with trunk-only commands and are syntactically or operationally invalid. Reference topic: Wireless Monitoring and Management - Cisco Spaces connector deployment, VLAN reachability, trunking, and analytics service scalability.
問題 #26
A deployment includes IoT sensors that support only 2.4 GHz connectivity. Performance issues occur because nearby APs heavily utilize overlapping channels. Which channel plan is recommended?
答案：C
解題說明：
In most regulatory domains, channels 1, 6, and 11 are the standard non-overlapping 2.4 GHz channels. Using these minimizes adjacent-channel interference and improves performance.
Overlapping channels create excessive interference and degraded wireless throughput for legacy IoT environments.
問題 #27
Refer to the exhibit. The Catalyst 9800 WLC logs show when a client with MAC address
9C:4E:36:8A:2B:F1 fails to connect to a WLAN configured for Wi-Fi Protected Access 3- Enterprise with 802.1X. Which action must the engineer take to resolve the issue?
答案：A
解題說明：
The log is a Layer 2 802.1X authentication failure, not an AP join or WLAN encryption mismatch.
In WPA3-Enterprise, the client authenticates with 802.1X/EAP through the configured AAA path.
Cisco's Catalyst 9800 WPA3 Enterprise configuration requires the necessary RADIUS or AAA servers and authentication lists before enabling WPA3 Enterprise, and the WLAN must reference the dot1x authentication list. Therefore, a Cred Fail reason points directly at the user/device credential validation path: the supplicant credentials, Active Directory identity source, RADIUS policy match, or RADIUS reachability.
Cisco's 9800 802.1X configuration workflow also shows the controller defining a RADIUS server, adding it to a RADIUS group, creating a dot1x AAA authentication method list, and applying that list to the WLAN. It further recommends checking whether the RADIUS server is alive and using ISE RADIUS Live Logs to inspect authentication requests and results. Option A is wrong because the AP is not the supplicant in this WLAN client authentication event. Option B downgrades the security model and avoids 802.1X rather than fixing it. Option D addresses NAC behavior, not a credential authentication failure.
問題 #28
What is the time taken for an RF signal to travel from the transmitter to the receiver known as?
答案：D
解題說明：
In RF communications,propagation delayrefers to the finite time required for a signal to travel from the transmitter to the receiver over a given medium. This delay depends on the distance between the endpoints and the speed at which electromagnetic waves propagate through the medium, typically close to the speed of light in air (approximately 3 × 10# m/s). Propagation delay is fundamental in calculating network latency, timing synchronization in protocols, and designing wireless coverage, especially in large-scale enterprise networks.
Reflection (option A) occurs when RF waves encounter surfaces and bounce back, potentially causing multipath interference. Scattering (option C) refers to signal dispersion caused by small objects or irregularities in the medium, which affects signal quality but not the direct travel time. Link speed (option D) represents the maximum data rate supported by a wireless link and is unrelated to the time taken for the signal to propagate.
Cisco wireless design guides emphasize propagation delay considerations when planning high-density deployments, especially in large campuses or long-range point-to-point links, to ensure timing-sensitive applications (e.g., VoIP, video conferencing) maintain acceptable performance. Propagation delay must be factored into QoS and RF design decisions to minimize latency and optimize throughput. Reference topic:RF Fundamentals - signal propagation, latency, multipath effects, and timing in wireless networks.
問題 #29
A school district is deploying Cisco Catalyst 9176 APs to remote sites with occasional WAN outages. The IT team wants the APs to attempt joining a secondary or tertiary Catalyst 9800 WLC if the primary controller is unreachable. The team must preconfigure all controller IP addresses using the AP CLI before deploying. Which set of CLI commands sets the primary, secondary, and tertiary controller IP addresses on a Catalyst 9176 AP?
答案：C
解題說明：
Cisco lightweight and Catalyst access points use CAPWAP for AP-to-controller discovery and join operations. For AP-side preconfiguration, Cisco documents the syntax as capwap ap {primary- base | secondary-base | tertiary-base} controller-name controller-ip-address, specifically for configuring primary, secondary, and tertiary controllers on the AP. This matches option B exactly because it includes the CAPWAP AP command, the controller priority keyword, the controller name, and the controller management IP address.
The Catalyst 9800 AP join process also recognizes these configured controller entries in priority order: primary controller using capwap ap primary-base, secondary controller using capwap ap secondary-base, and tertiary controller using capwap ap tertiary-base.
This allows the AP to attempt a backup controller when the preferred controller is unavailable, which is appropriate for remote sites with intermittent WAN reachability. Option A uses obsolete or invalid set controller syntax. Option C invents an ap join command format. Option D incorrectly inserts wlc into the AP CAPWAP command.
問題 #30
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Cisco的認證資格最近越來越受歡迎了。因為這是國際廣泛認可的資格，因此參加Cisco的認證考試的人也越來越多了。其中，350-101認證考試就是最重要的考試之一。那麼，為了通過這個考試你是怎麼進行準備的呢？是死命地學習與考試相關的知識呢，還是使用了高效率的學習資料呢？
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