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CWNP CWNA-109 Exam Syllabus Topics:

Topic	Details
Topic 1	Radio Frequency (RF) Technologies: This topic explains the basic features and behavior of RF. It also discusses applying the basic concepts of RF mathematics and measurement. Lastly, the topic covers RF signal characteristics and the functionality of RF antennas.
Topic 2	RF Validation and WLAN remediation: This topic covers RF interference, WLAN performance, the basic features of validation tools, and common wireless issues.
Topic 3	WLAN Protocols and Devices: It focuses on terminology related to the 802.11 MAC and PHY, the purpose of the three main 802.11 frame types, MAC frame format, and 802.11 channel access methods.

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CWNP Wireless Network Administrator (CWNA) Sample Questions (Q144-Q149):

NEW QUESTION # 144
You are a small business wireless network consultant and provide WLAN services for various companies. You receive a call from one of your customers stating that their laptop computers suddenly started experiencing much slower data transfers while connected to the WLAN. This company is located in a multi-tenant office building and the WLAN was designed to support laptops, tablets and mobile phones. What could cause a sudden change in performance for the laptop computers?

A. A new tenant in the building has set their AP to the same RF channel that your customer is using.
B. The antennas in the laptops have been repositioned.
C. The sky was not as cloudy that day as it typically is and the sun also radiates electromagnetic waves.
D. A few of your customer's users have Bluetooth enabled wireless headsets.

Answer: A

Explanation:
A possible cause of a sudden change in performance for the laptop computers is that a new tenant in the building has set their AP to the same RF channel that your customer is using. This can create co-channel interference (CCI), which is a situation where two or more APs or devices use the same or overlapping channels in the same area. CCI can degrade the performance of WLANs by increasing contention, collisions, retransmissions, and latency. CCI can also reduce the effective range and throughput of WLANs by lowering the signal-to-noise ratio (SNR). To avoid or mitigate CCI, it is recommended to use non-overlapping channels, adjust transmit power levels, or implement channel management techniques such as dynamic frequency selection (DFS) or load balancing. The sky condition, antenna position, or Bluetooth headset are not likely to cause a sudden change in performance for the laptop computers. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 81; [CWNA: Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 71.

NEW QUESTION # 145
In an 802.1X/EAP authentication exchange, what device acts as the "authenticator" that relays authentication messages between the client and the authentication server?

A. The RADIUS server
B. The access point or WLAN controller
C. The client's wireless network adapter (supplicant)
D. The Active Directory domain controller

Answer: B

Explanation:
In an 802.1X/EAP framework, there are three roles: the supplicant, which is the client device requesting network access; the authenticator, which is the access point or WLAN controller that controls access to the network and relays EAP messages between the supplicant and the authentication server; and the authentication server, typically a RADIUS server, which validates the credentials and makes the final access decision. The authenticator does not make authentication decisions itself; it simply passes messages back and forth and enforces the outcome.

NEW QUESTION # 146
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: C

NEW QUESTION # 147
You are a small business wireless network consultant and provide WLAN services for various companies. You receive a call from one of your customers stating that their laptop computers suddenly started experiencing much slower data transfers while connected to the WLAN. This company is located in a multi-tenant office building and the WLAN was designed to support laptops, tablets and mobile phones. What could cause a sudden change in performance for the laptop computers?

A. A new tenant in the building has set their AP to the same RF channel that your customer is using.
B. The antennas in the laptops have been repositioned.
C. The sky was not as cloudy that day as it typically is and the sun also radiates electromagnetic waves.
D. A few of your customer's users have Bluetooth enabled wireless headsets.

Answer: A

NEW QUESTION # 148
What is the final step in an effective troubleshooting process?

A. Notify the users of problem resolution
B. Document the results
C. Verify the solution
D. Disable the WLAN

Answer: B

Explanation:
The final step in an effective troubleshooting process is to document the results. Documentation is essential for keeping track of the problem history, the actions taken, the solutions implemented, and the outcomes achieved. Documentation can also help to prevent future problems, improve best practices, and provide feedback for improvement. Documentation should include relevant information such as problem description, symptoms, root cause analysis, resolution steps, verification methods, and lessons learned.

NEW QUESTION # 149
......

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