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問題 #108
You administer a small WLAN with nine access point. As a small business, you do not rum a RADIUS server and use WPA2-Personal for security. Recently, you changed the passphrase for WPA2-personal in all Aps and clients. Several users are now reporting the inability to connect to the network at time and it is constrained to one area of the building. When using scanner, you see that the AP covering that area is online
答案：D
解題說明：
This is because the passphrase for WPA2-Personal is case-sensitive and must match exactly on both the AP and the client. If the passphrase is entered incorrectly on the client, the client will not be able to authenticate with the AP and connect to the network. The AP that covers the problem area is not likely to require a firmware update, fail, or be improperly configured, as it is online and works with other clients that have the correct passphrase. To troubleshoot this issue, you can check the passphrase settings on the clients and make sure they matchwith the AP. You can also try to reconnect the clients to the network or reboot them if necessary. For more information on how to configure WPA2-Personal on your router
問題 #109
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?
答案：A
解題說明：
The clients are all 802.11n STAs or lower is the likely cause of this behavior. If a WLAN with 100
802.11ac access points is configured to use 80 MHz channels, but only 40 MHz communications are seen in a particular BSS, it means that the clients in that BSS do not support 80 MHz channels. This could be because they are using older standards, such as 802.11n or lower, that do not support 80 MHz channels. Alternatively, they could be using newer standards, such as
802.11ac or ax, but have their channel width settings limited to 40 MHz or lower due to device capabilities or configuration options. In either case, the AP will adapt to the client's channel width and use only 40 MHz of the 80 MHz allocated bandwidth to communicate with them. This will reduce the potential throughput and efficiency of the WLAN.
問題 #110
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?
答案：A
解題說明：
The near/far problem occurs when a client station located close to an access point transmits at a much higher received signal strength than a client station located farther away. This disparity can cause the AP's receiver to have difficulty properly receiving the weaker, distant signal, particularly if the strong nearby signal is transmitting at the same time or causing elevated noise levels. This can effectively "drown out" the distant client, resulting in poor performance or connectivity issues for stations farther from the AP.
問題 #111
An RF signal sometimes bends as it passes through a material rather than around an obstacle. What is the RF behavior that this statement best describes?
答案：C
解題說明：
Refraction is the bending of an RF signal as it passes through a material of different density. Refraction can cause the signal to change its direction and angle of arrival. For example, when a light beam passes from air to water, it bends because of the difference in the refractive index of the two mediums. Similarly, when an RF signal passes from one medium to another, such as from air to glass, it can bend due to the change in the dielectric constant of the materials12. References: 1:CWNA-109Official Study Guide, page 67 2: Refraction
問題 #112
What factors will have the most significant impact on the amount of wireless bandwidth available to each station within a BSS? (Choose 2)
答案：A,C
解題說明：
The factors that will have the most significant impact on the amount of wireless bandwidth available to each station within a Basic Service Set (BSS) are:
A). The number of client stations associated to the BSS
More client stations sharing the same BSS will reduce the available bandwidth for each station, as all clients must share the available airtime.
C). The presence of co-located (10m away) access points on non-overlapping channels Even though the channels are non-overlapping, the presence of nearby access points can still impact performance due to contention for airtime, especially if the access points are close together. This can lead to interference and reduce overall efficiency.
問題 #113
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