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Published on October 24, 2026

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CWNP Wireless Network Administrator (CWNA) Sample Questions (Q94-Q99):

NEW QUESTION # 94\ A wireless engineer measures a high VSWR value on an antenna cable run. What does this indicate?

[A. There is a significant impedance mismatch causing signal reflection.]{style="COLOR: red"}
B. The cable length is too short.
C. The transmitter power is set too low.
D. The antenna has excessive gain.

Answer: A

Explanation:\ Voltage Standing Wave Ratio (VSWR) is a measurement used to determine how efficiently RF power is transmitted from a source, through a transmission line, to a load such as an antenna. A high VSWR value indicates a significant impedance mismatch somewhere in the RF path, which causes a portion of the signal to be reflected back toward the transmitter instead of being radiated. This reflected energy can reduce range and, in extreme cases, damage the transmitter.\ An ideal VSWR value is close to 1:1, indicating minimal reflection.

NEW QUESTION # 95\ A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?

A. 26 dBm
B. 10 dBm
[C. 23 dBm]{style="COLOR: red"}
D. 13 dBm

Answer: C

Explanation:\ To calculate the EIRP at the antenna element, we need to add the transmitter output power, subtract the cable loss, and add the antenna gain. All these values need to be converted to dBm first, if they are not already given in that unit. In this case, we have:\ Transmitter output power = 50 mW = 10 log (50) dBm = 16.99 dBm Cable loss = 3 dB Antenna gain = 9 dBi EIRP = Transmitter output power - Cable loss + Antenna gain EIRP = 16.99 - 3 + 9 EIRP = 22.99 dBm Rounding up to the nearest integer, we get 23 dBm as the EIRP at the antenna element12. References: CWNA-\ 109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 92; CWNA-109 Study Guide, Chapter 2:\ Radio Frequency Fundamentals, page 88.

NEW QUESTION # 96\ You are reporting on the RF environment in your facility. The manager asks you to describe the noise floor noted in the report. Which of the following is the best explanation?

A. The extra energy radiated by access points and client devices beyond that intended for the signal.
B. The noise caused by elevators, microwave ovens, and video transmitters.
C. The energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands.
[D. The RF energy that exists in the environment from intentional and unintentional RF radiators that forms the baseline above which the intentional signal of your WLAN must exist.]{style="COLOR: red"}

Answer: D

Explanation:\ The RF energy that exists in the environment from intentional and unintentional RF radiators that forms the baseline above which the intentional signal of your WLAN must exist is the best explanation of the noise floor noted in the report. The noise floor is a term that describes the level of background noise or interference in a wireless channel or band. The noise floor is measured in dBm (decibel-milliwatts) and it represents the minimum signal strength that can be detected or received by a wireless device. The noise floor is influenced by various factors, such as the sensitivity of the receiver, the antenna gain, the cable loss, and the ambient RF environment. The ambient RF environment consists of intentional and unintentional RF radiators that emit RF energy in the wireless spectrum. Intentional RF radiators are devices that are designed to transmit RF signals for communication purposes, such as Wi-Fi access points, Bluetooth devices, microwave ovens, or cordless phones. Unintentional RF radiators are devices that are not designed to transmit RF signals but generate electromagnetic radiation as a by-product of their operation, such as USB 3 devices, PC power supplies, or fluorescent lights. The noise floor affects WLAN performance and quality because it determines the minimum signal-to-noise ratio (SNR) that is required for a successful wireless transmission. SNR is the difference between the signal strength of the desired signal and the noise floor of the channel. SNR is also measured in dB and it indicates how much the signal stands out from the noise. A higher SNR means a better signal quality and a lower bit error rate. A lower SNR means a worse signal quality and a higher bit error rate.\ Therefore, to achieve a reliable WLAN connection, the intentional signal of your WLAN must exist above the noise floor by a certain margin that depends on the data rate and modulation scheme used. The other options are not accurate or complete explanations of the noise floor noted in the report. The noise caused by elevators, microwave ovens, and video transmitters is not the noise floor but rather examples of interference sources that contribute to the noise floor. The extra energy radiated by access points and client devices beyond that intended for the signal is not the noise floor but rather an example of spurious emissions that cause interference to other devices or channels. The energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands is not the noise floor but rather an example of attenuation or reflection that reduces or changes the direction of the signal. References: CWNA-109 Study Guide, Chapter 5: Radio Frequency Signal and Antenna Concepts, page 139

NEW QUESTION # 97\ The requirements for a WLAN you are installing state that it must support unidirectional delays of less than 150 ms and the signal strength at all receivers can be no lower than -67 dBm. What application is likely used that demands these requirements?

A. FTP
[B. VoIP]{style="COLOR: red"}
C. RTLS
D. E-Mail

Answer: B

Explanation:\ VoIP (Voice over Internet Protocol) is an application that is likely used that demands the requirements of unidirectional delays of less than 150 ms and the signal strength at all receivers can be no lower than -67 dBm. VoIP is an application that allows users to make and receive voice calls over a network, such as the Internet or a WLAN. VoIP is a real-time and interactive application that requires high quality of service (QoS) to ensure good user experience and satisfaction. One of the QoS metrics for VoIP is delay, which is the time it takes for a voice packet to travel from the sender to the receiver. Delay can affect the quality and intelligibility of the voice conversation, as well as the synchronization and naturalness of the dialogue. The ITU-T G.114 recommendation suggests that the maximum acceptable one-way delay for VoIP should be less than 150 ms, as anything higher than that can cause noticeable degradation and annoyance to the users. Another QoS metric for VoIP is signal strength, which is the measure of how strong the RF signal is at the receiver. Signal strength can affect the reliability and performance of the wireless connection, as well as the data rate and throughput of the VoIP traffic. The CWNA Official Study Guide recommends that the minimum signal strength for VoIP should be -67 dBm, as anything lower than that can cause packet loss, retries, jitter, and other issues that can impair the voice quality.

NEW QUESTION # 98\ Lynne runs a small hotel, and as a value added service for his customers he has implemented a Wi-Fi hot-spot.\ Lynne has read news articles about how hackers wait at hot-spots trying to take advantage of unsuspecting users. He wants to avoid this problem at his hotel.\ What is an efficient and practical step that Lynne can take to decrease the likelihood of active attacks on his customers\' wireless computers?

A. Implement an SSL VPN in the WLAN controller that initiates after HTTPS login.
[B. Enable station-to-station traffic blocking by the access points in the hotel.]{style="COLOR: red"}
C. Implement Network Access Control (NAC) and require antivirus and firewall software along with OS patches.
D. Require EAP-FAST authentication and provide customers with a username/password on their receipt.

Answer: B

Explanation:\ In a public Wi-Fi hotspot, like the one Lynne runs in his hotel, ensuring customer security against active attacks is crucial. Active attacks involve unauthorized access, eavesdropping, or manipulation of the network traffic. To mitigate such threats, an effective and practical step is:\ * Station-to-Station Traffic Blocking: Also known as client isolation, this feature prevents direct communication between devices connected to the Wi-Fi network. By enabling this on the access points, Lynne can significantly decrease the likelihood of active attacks like man-in-the-middle (MITM) attacks, where an attacker intercepts and possibly alters the communication between two parties.\ The other options, while beneficial for network security, might not be as straightforward or practical for Lynne\'s situation:\ * Network Access Control (NAC)requires a more complex infrastructure and management, which might not be ideal for a small hotel setup.\ * Implementing an SSL VPNadds an extra layer of security but might complicate the login process for users, potentially affecting the user experience.\ * Requiring EAP-FAST authenticationprovides secure authentication but may not be feasible for transient customers who expect quick and easy network access.\ Therefore, enabling station-to-station traffic blocking is a practical and efficient measure that Lynne can implement to enhance customer security on the Wi-Fi network.\ References:\ * CWNA Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109, by David D: Coleman and David A. Westcott.\ * Best practices for securing a wireless network in a public hotspot environment.

NEW QUESTION # 99\ ......

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