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NEW QUESTION # 18
What feature was introduced in the 802.11h amendment in order to uphold regulatory requirements for 5 GHz operations.
Answer: C
NEW QUESTION # 19
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?
Answer: B
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 # 20
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?
Answer: D
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 VPN adds an extra layer of security but might complicate the login process for users, potentially affecting the user experience.
* Requiring EAP-FAST authentication provides 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: Exam CWNA-109, by David D.
Coleman and David A. Westcott.
Best practices for securing a wireless network in a public hotspot environment.
NEW QUESTION # 21
What condition occurs when a client station cannot detect another client station because it is out of range, but both stations can communicate with the same access point, resulting in potential frame collisions at the AP?
Answer: B
Explanation:
The hidden node problem occurs when two client stations are both within range of the same access point but are out of range of each other. Because each client cannot detect the other's transmissions using Clear Channel Assessment, they may transmit simultaneously, resulting in a collision at the access point. This problem is often mitigated using RTS/CTS (Request to Send/Clear to Send) protection, which reserves the medium before transmission to help prevent hidden node collisions.
NEW QUESTION # 22
A wireless engineer is troubleshooting an area where far-away clients associated with an AP experience poor performance because a nearby client is transmitting at a much higher signal level, effectively drowning out the weaker signal at the receiver. What is this condition called?
Answer: D
NEW QUESTION # 23
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