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質問 # 162
In an 802.11n (H T) 2.4 GHz BSS, what prevents each station from using all the airtime when other client stations are actively communicating in the same BSS?
正解：C
解説：
Explanation:What prevents each station from using all the airtime when other client stations are actively communicating in the same BSS is CSMA/C A . CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance and is a media access control method used by WLAN devices to share the wireless medium. CSMA/CA works by having each station sense the medium before transmitting a frame. If the medium is busy (i.e., another station is transmitting), the station defers its transmission until the medium is idle. If the medium is idle, the station waits for a random backoff period before transmitting. This way, CSMA/CA reduces the chances of collisions and ensures fair access to the medium for all stations. CSMA/CA also uses positive acknowledgements to confirm successful transmissions and retransmissions to recover from errors. CSMA/CD, DOS prevention, and OFDMA are not used by WLAN devices in a BSS.
質問 # 163
In a long-distance RF link, what statement about Fade Margin is true?
正解：B
解説：
Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading. It is the difference between the receiver's sensitivity and the actual received signal level. A higher Fade Margin indicates a more robust link that can withstand interference, attenuation, or other factors that may reduce the signal strength. A lower Fade Margin means that the link is more susceptible to failure or performance degradation. Fade Margin is usually expressed in decibels (dB) and can be calculated by subtracting the receiver sensitivity from the received signal level.
質問 # 164
Which antenna type radiates RF energy equally in all directions in a spherical pattern and is used primarily as a theoretical reference for calculating antenna gain?
正解：A
解説：
An isotropic radiator is a theoretical, hypothetical antenna that radiates RF energy equally in all directions, forming a perfect sphere. It does not exist in reality but is used as a baseline reference point for measuring antenna gain, expressed in dBi (decibels relative to an isotropic radiator). All real-world antennas focus energy in some directions more than others, and their gain is calculated by comparing their radiation pattern to that of the isotropic radiator.
質問 # 165
In a mesh BSS (MBSS), according to the 802.11 standard, what device connect the mesh to an Ethernet network?
正解：A
解説：
a mesh portal is a device that connects a mesh BSS (MBSS) to an Ethernet network, such as the Internet. A mesh portal acts as a bridge between the wired and wireless domains, and allows the mesh stations to communicate with external networks. A mesh portal is also a mesh point, which means it can forward traffic within the MBSS.
The other options are not correct. Option A. Mesh Gate is a device that connects a mesh BSS (MBSS) to another mesh BSS or another wireless network, such as an infrastructure BSS or an ad hoc network2. A mesh gate acts as a gateway between different wireless domains, and allows the mesh stations to communicate with other wireless networks. A mesh gate is also a mesh point, which means it can forward traffic within the MBSS. Option B. Mesh Switch is not a valid term in the 802.11 standard. Option C. Mesh Router is also not a valid term in the 802.11 standard.
質問 # 166
ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous) 802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux- based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.1X Authenticator?
正解：C
解説：
The device in the bridge implementation that acts as the 802.1X Authenticator is the root bridge.
The root bridge is the bridge that connects to the wired network and acts as the central point for all other bridges in the point-to-multipoint topology. The root bridge authenticates the non-root bridges using 802.1X/EAP and forwards their authentication requests to the RADIUS server. The non-root bridges act as the 802.1X Supplicants and use EAP methods such as EAP-TLS or EAP- PEAP to authenticate with the root bridge.
質問 # 167
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