CWNP CWNA-109 Practice Exams
Last updated on Oct 22,2026- Exam Code: CWNA-109
- Exam Name: Certified Wireless Network Administrator
- Certification Provider: CWNP
- Latest update: Oct 22,2026
What PHY layer mechanisms might be used to increase the range for an 802.11n radio using a MIMO system? (Choose all that apply.)
- A . Maximum ratio combining
- B . Guard interval
- C . Transmit beamforming
- D . Spatial multiplexing
What is the most effective method for testing roaming in relation to 802.11 VoIP handsets?
- A . Use a spectrum analyzer to monitor RF activity during a VoIP call.
- B . Use a protocol analyzer to capture the traffic generated when a laptop roams.
- C . Place a call with the handset and move around the facility to test quality during roaming.
- D . Use the built-in roaming monitor built into all VoIP handsets.
As a consultant, you’ve been hired by XYZ Company to provide recommendations about client device selection, operation, and interoperability.
What information should be considered to help them choose the right WLAN client devices?
- A . 802.11n OFDM is more susceptible to high-power, narrowband interference than 802.11a
- B . In order to earn Wi-Fi Alliance certification, 802.11n clients stations are required to support both 2.4 and 5 GHz frequencies
- C . 802.11ac devices support the features of the VHT PHY only in the 5 GHz frequency band.
- D . 802.11ac is not backwardly compatible with 802.11n or 802.11a.
- E . When HR/DSSS devices are present, VHT MCS rates are disabled for the entire BSS.
CCMP encryption uses which AES key size?
- A . 192 bits
- B . 64 bits
- C . 256 bits
- D . 128 bits
Which one of the following frequency ranges is not specified for use by IEEE 802.11 radios as of 802.11-2012?
- A . 5.725-5.874 GHz
- B . 600-630 MHz
- C . 5.15-5.25 GHz
- D . 2.4000-2.4835 MHz
Which of the following can cause roaming problems? (Choose all that apply.)
- A . Too little cell coverage overlap
- B . Too much cell coverage overlap
- C . Free space path loss
- D . CSMA/CA
- E . Hidden node
When antenna gain is reported in dBi, the gain of the antenna is compared to what theoretical radiator?
- A . End-fire radiator
- B . Dipole radiator
- C . Isotropic radiator
- D . Anthropomorphic radiator
How many modulation and coding schemes are defined in 802.11ac?
- A . 8
- B . 10
- C . 64
- D . 77
- E . 256
A client complains of low data rates on his computer. When you evaluate the situation, you see that the signal strength is -84 dBm and the noise floor is -96 dBm. The client is an 802.11ac client and connects to an 802.11ac AP. Both the client and AP are 2×2:2 devices.
What is the likely cause of the low data rate issue?
- A . Weak signal strength
- B . CAT5e cabling run to the AP
- C . Too few spatial streams
- D . Lack of support for 802.11n
You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen.
What is the likely cause of this behavior?
- A . All clients implement single spatial stream radios
- B . The clients are all 802.11n STAs or lower
- C . The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
- D . The short guard interval is also enabled