Wireless questions on the CCNA cover 802.11 standards (ax/ac/n), WPA3, SSID/BSSID concepts, WLC architecture (FlexConnect, local switching), and client connectivity troubleshooting. These are mostly MCQ and multi-select.
Start Scenario PracticeA company is deploying a new Cisco wireless LAN controller (WLC) and wants to use RADIUS for authenticating wireless users. The WLC is configured with the RADIUS server IP, shared secret, and authentication port 1812. However, users are unable to authenticate. The network engineer checks the RADIUS server logs and sees that the server is receiving authentication requests from the WLC but is responding with an 'Access-Reject' message. The WLC logs show 'RADIUS server not responding' for the same server. What is the most likely cause?
Explanation: The RADIUS server is receiving authentication requests and sending 'Access-Reject' responses, but the WLC logs show 'RADIUS server not responding'. This indicates the WLC is not receiving the responses. The most likely cause is a source IP mismatch: the RADIUS server sends responses from a different IP address than the one configured on the WLC. The WLC drops these responses because they do not match the expected source IP, making it appear as if the server is not responding.
An enterprise is migrating from a traditional three-tier campus design to a software-defined access (SD-Access) fabric. The engineer needs to ensure that the existing wireless infrastructure integrates seamlessly. Which component of SD-Access is responsible for integrating wireless and wired policies?
Explanation: The Fabric Edge node is the correct answer because it is the SD-Access component that serves as the attachment point for both wired and wireless endpoints. In an SD-Access fabric, the Fabric Edge node terminates the VXLAN tunnels from the wireless LAN controller (WLC) and applies consistent policy (e.g., SGT-based ACLs) to traffic from both wired and wireless users, ensuring seamless integration of the existing wireless infrastructure.
A network engineer runs the following command on a Cisco WLC: WLC# show wlan summary WLAN ID SSID Status Security Interface 1 Guest Enabled Open guest-vlan 2 Corporate Enabled WPA2 corp-vlan 3 IoT Disabled WPA2 iot-vlan 4 Management Enabled WPA2 mgmt-vlan Based on this output, what can be concluded?
Explanation: The 'show wlan summary' output clearly shows that WLAN 3 (IoT) has a Status of 'Disabled', meaning it is not operational and cannot serve clients. Only enabled WLANs can transmit beacons and accept client associations. Therefore, option B is correct because a disabled WLAN is effectively non-functional.
Drag and drop the steps of the CAPWAP discovery and join process between a lightweight AP and a WLC into the correct order, from first to last.
Explanation: The CAPWAP process starts with the AP obtaining an IP address (via DHCP), then discovering the WLC (via DHCP option 43 or DNS). The AP sends a Discovery Request, the WLC replies with a Discovery Response, and finally the AP sends a Join Request to establish the control tunnel.
An organization is implementing 802.1X for wireless users using Cisco ISE as the RADIUS server. The network engineer configures the wireless LAN controller (WLC) with 802.1X authentication. Users report that they can connect to the SSID but cannot access any network resources. The engineer checks the WLC and sees that users are authenticated and assigned to VLAN 100. The engineer also checks the switchport connecting the WLC and sees it is a trunk. What is the most likely issue?
Explanation: The users are authenticated and assigned to VLAN 100 by the RADIUS server, but the switch trunk port connecting the WLC does not have VLAN 100 in its allowed list. This means traffic from the WLC for VLAN 100 is dropped at the switch, preventing network access even though authentication succeeded. The trunk must explicitly permit VLAN 100 for the dynamic VLAN assignment to work.
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Practice all Wireless LAN and WLC ScenariosWireless questions on the CCNA cover 802.11 standards (ax/ac/n), WPA3, SSID/BSSID concepts, WLC architecture (FlexConnect, local switching), and client connectivity troubleshooting. These are mostly MCQ and multi-select. These appear throughout the 350-401 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 350-401. Practicing each scenario type ensures you're ready for any format.
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