The CWNA-109 exam validates your ability to plan, deploy, and troubleshoot enterprise wireless networks. Designed for network administrators and technicians, the Certified Wireless Network Administrator (CWNA) credential from CWNP demonstrates hands-on competency in WLAN architecture, security, and RF fundamentals. This page maps the exam syllabus, outlines question formats, and guides your study strategy so you can prepare efficiently and confidently.
Use this topic map to guide your study for CWNP CWNA-109 (Certified Wireless Network Administrator) within the Certified Wireless Network Administrator path.
The CWNA-109 exam combines knowledge recall with practical reasoning to assess both theoretical understanding and applied judgment. Questions progress in difficulty and reflect scenarios you will encounter in network operations and design.
Effective preparation balances topic review with hands-on practice. Allocate study time proportionally to exam weight, and reinforce connections between RF theory, protocol behavior, and deployment decisions. A structured 4-6 week plan works well for most candidates with networking experience.
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WLAN Network Architecture and Design Concepts, WLAN Network Security, and Radio Frequency (RF) Technologies typically represent the largest portion of the exam. However, all six topic areas are tested, so balanced preparation across all domains is essential. Review the official exam objectives to confirm current weighting.
RF theory explains why signals degrade (path loss, fading) and how antennas and power settings affect coverage. Protocol knowledge tells you how devices respond to weak signals (roaming, retransmission). Together, they inform design decisions: you choose AP placement based on RF predictions, then configure protocols to handle the resulting coverage patterns. Understanding both prevents costly redesigns.
While the exam does not require hands-on labs, practical experience with site surveys, AP configuration, and troubleshooting significantly improves your ability to answer scenario-based questions. If you lack field experience, prioritize lab work on RF measurement tools, WPA2/WPA3 configuration, and roaming behavior. Even simulated labs help build intuition.
Misunderstanding regulatory channel rules (especially for non-US regions) is frequent. Confusing 802.11 frame types and their role in authentication/association also trips up many candidates. Additionally, overlooking the practical constraints of RF (interference, fading) when answering design questions leads to suboptimal choices. Read scenario questions carefully and consider real-world trade-offs, not just theoretical ideals.
Focus on weak topics identified in your practice tests rather than re-reading all material. Take one final timed practice test to confirm pacing and build confidence. Review detailed explanations for any questions you missed. Avoid cramming new topics; instead, reinforce your understanding of core concepts and practice applying them to unfamiliar scenarios. Get adequate sleep before exam day.
You are evaluating access points for use in the 5 GHz frequency band. What PHY supports this band and supports 80 MHz channels?
The other options are not correct because:
You were previously onsite at XYZ's facility to conduct a pre-deployment RF site survey. The WLAN has been deployed according to your recommendations and you are onsite again to perform a post-deployment validation survey.
When performing this type of post-deployment RF site survey voice over Wi-Fi, what is an action that must be performed?
When performing a post-deployment validation survey for voice over Wi-Fi (VoWiFi), an action that must be performed isApplication analysis with an active phone call on a VoWiFi handset. Application analysis is a method of testing the performance of a specific application over the WLAN by measuring parameters such as throughput, latency, jitter, packet loss, MOS score, and R-value. Application analysis with an active phone call on a VoWiFi handset can help to evaluate the quality of service (QoS) and user experience of VoWiFi calls over the WLAN. It can also help to identify any issues or bottlenecks that may affect VoWiFi calls such as interference, roaming delays, or insufficient coverage.Reference:[CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 549; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-109], page 519.
When using a spectrum to look for non Wi-Fi interference sources, you notice significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a users workspace, but the interference disappears quickly after just 2 meters. What is the most likely cause of this interference?
USB 3 devices in the user's work area are the most likely cause of this interference when using a spectrum analyzer to look for non-Wi-Fi interference sources. A spectrum analyzer is a tool that measures and visualizes the radio frequency activity and interference in the wireless environment. A spectrum analyzer can show the spectrum usage and energy levels on each frequency band or channel and help identify and locate the sources of interference. Interference is any unwanted signal that disrupts or degrades the intended signal on a wireless channel. Interference can be caused by various sources, such as other Wi-Fi devices, non-Wi-Fi devices, or natural phenomena. Interference can affect WLAN performance and quality by causing signal loss, noise, distortion, or errors. USB 3 devices are non-Wi-Fi devices that use USB 3.0 technology to transfer data at high speeds between computers and peripherals, such as hard drives, flash drives, cameras, or printers. USB 3 devices can generate electromagnetic radiation that interferes with Wi-Fi signals in the 2.4 GHz band, especially when they are close to Wi-Fi devices or antennas. USB 3 devices can cause significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a user's workspace, but the interference disappears quickly after just 2 meters. This is because USB 3 devices emit broadband interference that affects all channels in the 2.4 GHz band with a high intensity near the source but a low intensity at a distance due to attenuation. The other options are not likely to cause this interference pattern when using a spectrum analyzer to look for non-Wi-Fi interference sources. Bluetooth devices in the user's work area are non-Wi-Fi devices that use Bluetooth technology to communicate wirelessly between computers and peripherals, such as keyboards, mice, headphones, or speakers. Bluetooth devices can cause interference with Wi-Fi signals in the 2.4 GHz band, but they use frequency hopping spread spectrum (FHSS) technique that changes frequencies rapidly and randomly within a range of 79 channels. Therefore, Bluetooth devices do not cause significant interference across the entire 2.4 GHz band (not on a few select frequencies), but rather intermittent interference on some channels at different times. Excess RF energy from a nearby AP is not a non-Wi-Fi interference source but rather a Wi-Fi interference source that occurs when an AP transmits more power than necessary for its coverage area. Excess RF energy from a nearby AP can cause co-channel interference (CCI) with other APs or client devices that use the same channel within range of each other. CCI reduces performance and capacity because it causes contention and collisions on the wireless medium,
What factors will have the most significant impact on the amount of wireless bandwidth available to each station within a BSS? (Choose 2)
The factors that will have the most significant impact on the amount of wireless bandwidth available to each station within a BSS are:
The number of client stations associated to the BSS
The presence of co-located (10m away) access points on non-overlapping channels
The number of client stations associated to the BSS affects the wireless bandwidth because each station shares the same channel and medium with other stations in the same BSS. The more stations there are, the more contention and collision there will be for the channel access, which reduces the throughput and efficiency of the wireless communication. The wireless bandwidth available to each station depends on how the access point allocates the channel resources and how the stations use the channel time. For example, if the access point uses a round-robin scheduling algorithm, each station will get an equal share of the channel time regardless of its data rate or traffic demand. However, if the access point uses a proportional fair scheduling algorithm, each station will get a share of the channel time that is proportional to its data rate and traffic demand, which may result in higher or lower bandwidth for different stations.
The presence of co-located (10m away) access points on non-overlapping channels affects the wireless bandwidth because even though they use different channels, they may still cause interference and noise to each other due to channel leakage or imperfect filtering. The interference and noise can degrade the signal quality and SNR of the wireless communication, which reduces the data rate and throughput of the wireless communication. The wireless bandwidth available to each station depends on how well the access point and the station can cope with the interference and noise from other channels. For example, if the access point and the station support dynamic frequency selection (DFS) or adaptive radio management (ARM), they can switch to a less congested channel or adjust their output power or antenna gain to avoid or minimize interference from other channels.
What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?
OFDM is a modulation method that divides the channel bandwidth into multiple subcarriers, each carrying a single data symbol. This allows for higher data rates and more robust transmissions in multipath environments. OFDM was first introduced in the 802.11a standard, which operates in the 5 GHz band and supports data rates up to 54 Mbps. Later, the 802.11g standard adopted OFDM for the 2.4 GHz band, and the 802.11n and 802.11ac standards enhanced OFDM with features such as MIMO (Multiple Input Multiple Output), channel bonding, and higher-order modulation schemes to achieve data rates up to 600 Mbps and 6.9 Gbps, respectively. These standards are collectively known as the ERP (Extended Rate PHY), HT (High Throughput), and VHT (Very High Throughput) PHYs .Reference:[CWNA-109 Study Guide], Chapter 4: Radio Frequency Signal and Antenna Concepts, page 163; [CWNA-109 Study Guide], Chapter 4: Radio Frequency Signal and Antenna Concepts, page 157.
