CWNA Certification CWNA-108 Real Exam Questions and Answers FREE Updated on Sep 27, 2021
CWNA-108 Ultimate Study Guide - Actual4Dumps
NEW QUESTION 14
You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?
- A. 104 ms
- B. 10 ms
- C. 400 ns
- D. 800 ns
Answer: C
NEW QUESTION 15
In an 802.11n WLAN with a heterogeneous set of associated client devices including 802.11b,
11g, and 11n, what HT protection mode will the BSS use?
- A. Mode 3: Non-HT mixed mode
- B. Mode 1: Nonmember protection mode
- C. Mode 0: No protection mode (Greenfield)
- D. Mode 2: 20 MHz protection mode
Answer: A
NEW QUESTION 16
What Linux shell command can be used to view the hardware and PHY capabilities of a wireless adapter in detail including channel widths, output power setting, channels supported, and more?
- A. netsh wlan show device
- B. iw phy
- C. iwconflg
- D. ifconflg
Answer: C
NEW QUESTION 17
A string of characters and digits is entered into an AP and a client STA for WPA2 security. The string is 8 characters long. What is this string called?
- A. WEP key
- B. PSK
- C. MSK
- D. Passphrase
Answer: B
NEW QUESTION 18
An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss.
The cable is connected to an antenna with 16 dBi of gain.
What is the EIRP power output?
- A. 1000 mW
- B. 25 mW
- C. 50 mW
- D. 250 mW
- E. 10 mW
Answer: A
NEW QUESTION 19
Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere each other when they transmit frames. Assuming no other Aps are in the vicinity, is CCI still a possibility in this network and why?
- A. No, because CCI only occurs in the 5 GHz frequency band
- B. No, because the Aps are far enough apart that no CCI will occur
- C. Yes, because channel 11 loops around and causes CCI with channel 1
- D. Yes, because the client devices connected to one of the channel 1 APs will transmit frames that reach the other channel 1 AP as well as
Answer: D
NEW QUESTION 20
You are using a tool that allows you to see signal strength for all Aps in the area with a visual representation. It shows you SSIDs available and the security settings for each SSID. It allows you to filter by frequency band to see only 2.4 GHz networks or only 5 GHz networks. No additional features are available.
What kind of application is described?
- A. Protocol analyzer
- B. WLAN scanner tool
- C. Spectrum analyzer
- D. Site survey utility
Answer: B
NEW QUESTION 21
What statement about the IEEE 802.11e QoS facility is true?
- A. 802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.
- B. Four 802.1p user priorities are mapped to eight 802.11 transmit queues.
- C. 802.11 control frames are assigned to the 802.11 EF priority queue.
- D. When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.
Answer: A
NEW QUESTION 22
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 for voice over Wi-Fi. what is an action that must be performed?
- A. Application analysis with an active phone call on a VoWiFi handset
- B. Protocol analysis to discover channel use on neighboring APs
- C. Spectrum analysis to locate and identity RF Interference sources
- D. Frequency-band hopping analysis to detect improper RF channel implementations
Answer: C
NEW QUESTION 23
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 9 dBi gain, what is the EIRP at the antenna element?
- A. 13 dBm
- B. 26 dBm
- C. 23 dBm
- D. 10 dBm
Answer: C
NEW QUESTION 24
What is appended to the end of each 802.11 data frame after the payload?
- A. PHY header
- B. FCS
- C. Preamble
- D. MAC header
Answer: B
NEW QUESTION 25
Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?
- A. Patch and panel
- B. Dish and grid
- C. Dipole and yagi
- D. Grid and sector
Answer: A
NEW QUESTION 26
During a post-implementation survey, you have detected a non-802.11 wireless device transmitting in the area used by handheld 802.11g scanners. What is the most important factor in determining the impact of this non-802.11 device?
- A. Airtime utilization
- B. Protocols utilized
- C. Channel occupied
- D. Receive sensitivity
Answer: A
Explanation:
Airtime Utilization is a per-channel statistic that defines what percentage of the channel is currently being used, and what percentage is therefore free. Airtime usage can come from: Data traffic to and from client devices. Interference from WiFi and non-WiFi sources. Management overhead from APs and client devices. https://wyebot.com/2019/06/06/understanding-airtime-utilization/
NEW QUESTION 27
An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss.
The cable is connected to an antenna with 16 dBi of gain.
What is the EIRP power output?
- A. 1000 mW
- B. 2 W
- C. 250 mW
- D. 500 mW
Answer: A
NEW QUESTION 28
In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?
- A. 7 and 11
- B. 1 and 5
- C. 2 and 8
- D. 4 and 6
Answer: D
NEW QUESTION 29
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