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NEW QUESTION # 120
In a long-distance RF link, what statement about Fade Margin is true?
Answer: B
Explanation:
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. References: 1, Chapter 2, page
51; 2, Section 2.1
NEW QUESTION # 121
What condition occurs when two or more APs operating on the same channel are within range of each other, causing them to share airtime through the CSMA/CA contention process?
Answer: D
Explanation:
Co-channel interference (CCI) occurs when two or more APs, or BSSs, are configured on the same channel and are within range of each other. Because they operate on the same channel, they must share airtime using the CSMA/CA contention mechanism, meaning only one device can transmit at a time to avoid frame corruption. While technically not "interference" in the destructive sense of corrupting a signal, CCI reduces available airtime and overall network throughput as more devices compete for the same channel.
NEW QUESTION # 122
In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?
Answer: B
NEW QUESTION # 123
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: A
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. References: 1, Chapter 9, page
367; 2, Section 6.3
NEW QUESTION # 124
Your consulting firm has recently been hired to complete a site survey for a company desiring an indoor coverage WI-AN. Your engineers use predictive design software for the task, but the company insists on a pre-design site visit.
What task should be performed as part of the pre-design visit to prepare for a predictive design?
Answer: B
Explanation:
A pre-design site visit in preparation for a predictive wireless LAN design is essential for gathering physical and environmental data about the site. The key tasks to be performed during such a visit include:
Evaluating Building Materials: Different materials (concrete, glass, wood, etc.) have varying effects on RF signal propagation. Understanding the materials present helps in accurately predicting how signals will behave within the environment.
Floor Plan Verification: Ensuring that the floor plan documents are an accurate representation of the actual building layout is crucial. Discrepancies between the floor plans and the physical layout can lead to inaccuracies in the predictive design.
The other options, while potentially valuable in other contexts, are not directly related to preparing for a predictive design:
Installing APs (option A) for testing co-channel interference is more aligned with an active site survey rather than a pre-design visit for a predictive design. Collecting information about security requirements (option B) is important but is not directly related to the physical aspects of the site that would impact a predictive design. Testing antenna types (option C) would typically be part of an active site survey or the actual deployment phase, not a pre-design visit for predictive modeling. Therefore, option D is the correct answer, focusing on evaluating physical aspects crucial for accurate predictive modeling.
NEW QUESTION # 125
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