20+ practice questions focused on Wireless Infrastructure — one of the most tested topics on the ENCOR 350-401 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Wireless Infrastructure PracticeA network engineer is deploying a new wireless LAN controller (WLC) in a campus network. The WLC must manage 200 access points across three buildings. The engineer configures the WLC with a management IP address and enables CAPWAP. However, the access points fail to join the WLC. The APs are in the same VLAN as the WLC and can ping the WLC's management IP. What is the most likely cause of the APs not joining?
Explanation: The correct answer is that the APs are unable to discover the WLC via CAPWAP because the WLC's CAPWAP source interface is not configured or is misconfigured. Even though the APs can ping the management IP, CAPWAP discovery requires the WLC to respond from a consistent source IP. The other options are less likely: DHCP option 43 is not needed if APs are in the same subnet, APs do not need a specific IOS version to join, and APs do not need a static IP if they can obtain one via DHCP.
A company is deploying a new wireless network in a large warehouse. The network engineer must choose between using a centralized WLC architecture (with CAPWAP tunnels) or a converged access (SD-Access) wireless architecture. The warehouse has high-density client areas and requires low latency for real-time applications like voice and video. Which architecture should the engineer choose and why?
Explanation: The correct answer is converged access (SD-Access) because it enables local switching of traffic at the access layer, reducing latency and improving performance for real-time applications. Centralized CAPWAP tunnels would force all traffic back to the WLC, increasing latency. The other options are incorrect because centralized architecture does not inherently provide better RF management, and SD-Access does not require more APs or more WLCs.
A network engineer is troubleshooting a wireless network where clients in a conference room experience intermittent connectivity. The engineer notices that the access point in that room is showing a high number of CRC errors on its uplink interface. The AP is connected to a Cisco 9300 switch via a copper cable. What is the most likely cause of the CRC errors?
Explanation: CRC errors typically indicate physical layer issues such as faulty cabling, bad connectors, or electromagnetic interference. Since the AP is connected via copper, a faulty cable is the most likely cause. Duplex mismatch would cause alignment errors, not just CRC. AP overload would not cause CRC errors on the uplink. PoE issues would cause power problems, not CRC errors.
An engineer is configuring a new Cisco 9800 WLC in a branch office. The WLC will manage 50 APs and must provide guest access with a captive portal. The engineer configures a guest SSID with open authentication and a redirect ACL for the captive portal. However, after the configuration, clients can associate to the guest SSID but cannot reach the captive portal page. What is the most likely cause?
Explanation: The correct answer is that the redirect ACL is not properly configured to allow DNS and HTTP traffic to the captive portal server. Without proper ACL entries, the client's HTTP request is not redirected to the portal. The other options are incorrect because open authentication does not require a pre-shared key, the WLC does not need a specific interface for guest traffic (it can use a service port or management interface), and captive portal does not require RADIUS authentication by default.
A network engineer is deploying a wireless mesh network using outdoor access points. The mesh APs are configured to use 802.11a/n on the 5 GHz band for backhaul and 802.11b/g/n on the 2.4 GHz band for client access. The engineer notices that the mesh backhaul links are unstable and have high packet loss. What is the most likely cause of the instability?
Explanation: The correct answer is that the backhaul and client access channels are overlapping, causing interference. Using the same band for both backhaul and client access can lead to co-channel interference, especially if channels are not carefully planned. The other options are less likely: 802.11a/n is not obsolete, mesh backhaul does not require a wired connection, and 5 GHz generally has better range than 2.4 GHz for backhaul.
+15 more Wireless Infrastructure questions available
Practice all Wireless Infrastructure questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Wireless Infrastructure. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Wireless Infrastructure questions on the 350-401 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Wireless Infrastructure is tested as part of the ENCOR 350-401 blueprint. Practicing with targeted Wireless Infrastructure questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free 350-401 practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but Wireless Infrastructure is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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