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NEW QUESTION # 169
What security protocol, mandated by the Wi-Fi Alliance, replaced WPA2 and introduced Simultaneous Authentication of Equals (SAE) as a replacement for the PSK four-way handshake?
Answer: A
Explanation:
WPA3 is the current WLAN security certification from the Wi-Fi Alliance, and it introduced Simultaneous Authentication of Equals (SAE) as a replacement for the WPA2-Personal pre- shared key exchange. SAE, based on the Dragonfly key exchange protocol, protects against offline dictionary attacks by requiring an interactive exchange between the client and AP for each authentication attempt, unlike the older four-way handshake which could be captured and attacked offline. WPA3 also introduced mandatory Protected Management Frames (PMF).
NEW QUESTION # 170
What terms accurately complete the following sentence?
The IEEE 802.11-2016 standard specifies mandatory support of the _______________ cipher suite for Robust Security Network Associations, and optional use of the ________________ cipher suite, which is designed for use with pre-RSNA hardware and is deprecated.
Answer: B
NEW QUESTION # 171
What term describes the bending of an RF signal as it passes from one medium into another medium of different density?
Answer: C
Explanation:
Refraction is the bending of an RF wave as it travels from one medium into a medium with a different density, such as when a signal passes through layers of the atmosphere with different temperatures and humidity levels. This bending occurs because the speed of the wave changes as it enters the new medium. Refraction can cause the signal path to curve, which is especially relevant in long-distance outdoor bridge links where atmospheric conditions can affect the predicted line-of-sight path.
NEW QUESTION # 172
You are performing a post-implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?
Answer: A
Explanation:
A Wi-Fi scanner is a basic tool that can be used to easily locate areas of high co-channel interference. A Wi- Fi scanner is a software application that can run on a laptop, tablet, smartphone, or other device that has a Wi- Fi adapter. A Wi-Fi scanner can scan the wireless environment and display information about the detected access points and client stations, such as their SSID, BSSID, channel, signal strength, security, and data rate.
A Wi-Fi scanner can also show the channel utilization and overlap of different access points, which can indicate the level of co-channel interference. Co-channel interference is a type of interference that occurs when multiple access points use the same or adjacent channels within the same coverage area. Co-channel interference can reduce the throughput and performance of the WLAN, as the access points and client stations have to contend for the channel access and avoid collisions. To identify areas of high co-channel interference, a Wi-Fi scanner can be used to measure the signal strength and channel utilization of different access points and compare them with a threshold or a baseline. Alternatively, a Wi-Fi scanner can also use a color-coded heat map to visualize the co-channel interference level in different locations. References: 1, Chapter 7, page
279; 2, Section 4.3
NEW QUESTION # 173
You are implementing a multi-AP WLAN and fast secure roaming is essential. Which one of the following methods is an IEEE 802.11 standard method for fast roaming?
Answer: C
Explanation:
FT (Fast Transition) is an IEEE 802.11 standard method for fast roaming. FT is defined in the IEEE 802.11r amendment and is also known as Fast BSS Transition (FBT) or Fast Secure Roaming. FT is a feature that allows a client station to quickly switch from one AP to another within the same ESS (Extended Service Set) without having to re-authenticate and re-associate with each AP. This reduces the latency and packet loss that may occur during roaming, thus improving the user experience and maintaining the security of the connection. FT works by using pre-authentication and key caching mechanisms that allow the client station and the APs to exchange security information before the actual roaming occurs. This way, when the client station decides to roam to a new AP, it can use a fast reassociation request and response that contain only a few fields, instead of a full authentication and association exchange that require more time and data.
NEW QUESTION # 174
......
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