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CWNP CWNA-109 Exam
Certified Wireless Network Administrator (Page 2 )

Updated On: 1-Feb-2026
Page 2 of 26
PDF with 122 Questions

An RF signal sometimes bends as it passes through some material other than free space.
What is the term that describes this behavior?

  1. Refraction
  2. Warping
  3. Scattering
  4. Reflection

Answer(s): A

Explanation:

Refraction is the bending of an RF signal as it passes through a medium with a different density than free space. This can cause the signal to change its direction and speed, which can affect the accuracy and reliability of wireless communication. Refraction is influenced by factors such as temperature, humidity, and atmospheric pressure12.


Reference:

CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 72; CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 67.



A POE device requires 47 W of power.
What POE specification should be used?

  1. 802.3at
  2. 802.3af
  3. 802.3bt
  4. 802. 11at

Answer(s): C

Explanation:

A POE device that requires 47 W of power should use the 802.3bt specification. This is because 802.3bt is the latest POE standard that supports up to 90 W of power delivery over four pairs of wires in an Ethernet cable. The previous POE standards, such as 802.3af and 802.3at, only support up to 15.4 W and 30 W of power delivery over two pairs of wires in an Ethernet cable, respectively. Therefore, they are not sufficient for powering a device that requires 47 W of power. The 802.11at specification does not exist; it is a typo or confusion with the 802.3at specification.


Reference:

CWNA-109 Study Guide, Chapter 8: Wireless LAN Access Points, page 2431



You must plan for POE in an office environment.
Which one of these devices is least likely to be a POE PSE?

  1. Midspan multi-port injector
  2. Switch
  3. VolP Phone
  4. Midspan injector

Answer(s): C

Explanation:

A VoIP phone is least likely to be a POE PSE of the devices listed. POE stands for Power over Ethernet, which is a technology that allows devices to receive both power and data over a single Ethernet cable. A POE PSE stands for Power Sourcing Equipment, which is a device that provides power to other devices over Ethernet. A POE PD stands for Powered Device, which is a device that receives power from a PSE over Ethernet. A midspan multi-port injector, a switch, and a midspan injector are examples of POE PSEs, as they can supply power to multiple devices over Ethernet cables. A VoIP phone is an example of a POE PD, as it can receive power from a PSE over an Ethernet cable. However, some VoIP phones can also act as POE PSEs for other devices, such as IP cameras or wireless access points, but this is not very common.


Reference:

CWNA-109 Study Guide, Chapter 8:

Wireless LAN Access Points, page 2411



Which one of the following 802.11 PHYs is more likely to be used in an industrial deployment but not likely to be used in standard office deployments?

  1. S1G
  2. VHT
  3. OFDM
  4. HT

Answer(s): A

Explanation:

S1G is one of the 802.11 PHYs that is more likely to be used in an industrial deployment but not likely to be used in standard office deployments. This is because S1G stands for Sub-1 GHz, which means it operates in the frequency bands below 1 GHz, such as 900 MHz and 868 MHz. These bands offer better penetration and range than the higher frequency bands used by other 802.11 PHYs, such as

2.4 GHz and 5 GHz. This makes S1G suitable for industrial applications that require robust and reliable wireless communication in harsh environments, such as factories, warehouses, mines, and smart grids. S1G also supports low-power and low-data-rate devices, such as sensors, actuators, and meters, which are common in industrial Internet of Things (IoT) scenarios. VHT, OFDM, and HT are other 802.11 PHYs that are more commonly used in standard office deployments, as they offer higher data rates and capacity than S1G, but have lower range and penetration.


Reference:

CWNA-109 Study Guide, Chapter 3: Radio Frequency Technologies, page 751



A natural disaster has occurred in a remote area that is approximately 57 miles from the response team headquarters. The response team must implement a local wireless network using 802.11 WLAN access points.
What is the best method, of those listed, for implementation of a network back- haul for communications across the Internet in this scenario?

  1. 802.11 bridging to the response team headquarters
  2. Cellular/LTE/5G
  3. Turn up the output power of the WLAN at the response team headquarters
  4. Temporary wired DSL

Answer(s): B

Explanation:

Cellular/LTE/5G is the best method for implementing a network backhaul for communications across the Internet in a remote area that is affected by a natural disaster. This is because cellular/LTE/5G networks are wireless and do not depend on physical infrastructure that may be damaged or unavailable in such scenarios. Cellular/LTE/5G networks also offer high-speed data transmission and wide coverage area, which are essential for emergency response operations. 802.11 bridging to the response team headquarters is not feasible because it requires line-of-sight and has limited range. Turning up the output power of the WLAN at the response team headquarters is not effective because it may cause interference and does not guarantee reliable connectivity. Temporary wired DSL is not practical because it requires installing cables and equipment that may not be available or accessible in a remote are a.


Reference:

CWNA-109 Study Guide, Chapter 7: Wireless LAN Topologies, page 2031



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