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 network administrator is troubleshooting a wireless connectivity issue in a large office. Users on the 5 GHz band report intermittent disconnections and slow performance, while 2.4 GHz clients are unaffected. The office uses a Cisco 9800 WLC with APs that support 802.11ac Wave 2. The administrator checks the WLC's RF profile and notices a high number of channel utilization reports on channel 36. What is the most likely cause of the problem?
Explanation: Channel 36 is a 20 MHz channel in the 5 GHz band. When many APs use the same channel (channel 36), they share the same medium, leading to co-channel interference (CCI). This causes intermittent disconnections and slow performance for 5 GHz clients because they must contend for airtime. Spreading APs across non-overlapping channels like 40, 44, or 48 reduces CCI and improves performance.
A wireless client joins the correct SSID and gets an address in the correct employee subnet, but cannot reach only one internal application while everything else works. Which troubleshooting area is the strongest first target?
Explanation: The strongest first target is the application path or policy specific to that application because the client already has general connectivity: it joined the correct SSID, authenticated, and obtained an IP address in the employee subnet. A failure limited to one internal application indicates that basic WLAN join, DHCP, and overall routing are working; therefore, ACLs, firewall rules, DNS resolution for that service, or application-specific policies are the likely cause. Option B (SSID broadcast setting) is irrelevant because the client successfully joined the SSID and has connectivity. Option C (voice VLAN on the wired access port) is not a first target because the symptom involves a single data application, not voice, and the client is on the employee subnet, not a voice VLAN. Option D (OSPF router ID on the client) is invalid because client devices do not typically run OSPF; OSPF runs on routers, not wireless clients.
A user reports that a laptop can connect to the correct SSID but repeatedly fails authentication when joining the WLAN. Which category of issue is most strongly indicated?
Explanation: The strongest indication is a wireless security or authentication mismatch rather than a pure RF coverage problem. In practical terms, the laptop can already see and attempt to join the correct SSID, which means discovery is working. Repeated authentication failure points more directly to credentials, security settings, or authentication-policy alignment than to channel or signal absence. This question is about recognizing the stage of failure. The client is finding the WLAN, but it is not being accepted onto it.
You are connected to a multilayer switch MLS1 via the console. Configure MLS1 so that IP phones connected to interface GigabitEthernet0/1 receive power via PoE, use VLAN 10 for data traffic, and use VLAN 20 for voice traffic, while the access port for an AP on GigabitEthernet0/2 should be placed in VLAN 30 and have PoE disabled. Verify your configuration using appropriate show commands.
Explanation: For the IP phone port (G0/1), you need to enable PoE (power inline auto) and configure the voice VLAN (switchport voice vlan 20) so that the phone uses VLAN 20 for voice and the access VLAN 10 for data. For the AP port (G0/2), you must change the access VLAN to 30 and disable PoE (power inline never) to prevent powering the AP through the switch. Verify with 'show interfaces switchport' to confirm voice VLAN and access VLAN settings, and 'show power inline' to check PoE status.
You are troubleshooting connectivity for a wireless client connected to the home network shown below. The client has obtained an APIPA address (169.254.x.x), indicating DHCP failure. Verify the DHCP server configuration on R1 and correct the issue so that the client receives a valid IP address from the 192.168.1.0/24 subnet.
Explanation: The client obtained an APIPA address (169.254.x.x) because DHCP was not assigning addresses. The DHCP pool is correctly configured, but the global DHCP service must be enabled with the 'service dhcp' command on R1. The excluded-address range (192.168.1.1–192.168.1.10) uses only a small fraction of the /24 subnet, so it is not the issue. Enabling 'service dhcp' allows the router to process DHCP requests and assign addresses from the pool.
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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 200-301 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 200-301. Practicing each scenario type ensures you're ready for any format.
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