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| Section | Objectives |
|---|---|
| Topic 1: 802.11 Protocol and MAC Layer | - Frame types and communication process
|
| Topic 2: WLAN Network Design | - Design principles and planning
|
| Topic 3: WLAN Security and Management | - Security mechanisms and monitoring
|
| Topic 4: RF Technologies and Fundamentals | - Radio frequency principles and behavior
|
| Topic 5: WLAN Infrastructure and Devices | - Access points and client devices
|
| Topic 6: WLAN Regulations and Standards | - Wireless standards and amendments
|
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95. Frage
In a split-MAC architecture, which functions are typically handled by the WLAN controller rather than the access point?
Antwort: D
Begründung:
In a split-MAC architecture, MAC layer functions are divided between the access point and the WLAN controller. Time-sensitive, real-time functions such as beacon generation, frame acknowledgment, and RTS/CTS handling remain at the access point, since they require very fast response times. Centralized, non-real-time functions, such as authentication, key management, RF channel and power management, and roaming coordination, are handled by the WLAN controller. This division allows for centralized policy control while keeping latency-sensitive operations local to the AP.
96. Frage
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?
Antwort: B
Begründung:
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.
97. Frage
What security option for 802.11 networks supports SAE and requires protected management frames?
* WPA
Antwort: C
Begründung:
The security option for 802.11 networks that supports SAE and requires protected management frames is WPA3. WPA3 stands for Wi-Fi Protected Access version 3 and is the latest security standard for WLANs.
WPA3 supports two modes: WPA3-Personal and WPA3-Enterprise. WPA3-Personal uses Simultaneous Authentication of Equals (SAE) as the key exchange protocol, which provides stronger protection against offline dictionary attacks and password guessing than WPA2-Personal. WPA3 also requires protected management frames, which are encrypted frames that prevent spoofing, replay, or denial-of-service attacks on management frames such as deauthentication or disassociation frames. WPA, WPA2, and OWE do not support SAE or require protected management frames. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 307; [CWNA: Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 297.
98. Frage
Why is it generally recommended to design overlapping coverage cells with approximately 15-
20% overlap between adjacent access points in an enterprise WLAN?
Antwort: B
Begründung:
Designing for approximately 15-20% cell overlap between adjacent access points ensures that a client station roaming from one AP's coverage area to another maintains an adequate signal level throughout the transition, allowing it to roam to the new AP before completely losing connectivity to the previous one. Too little overlap can result in coverage gaps or dropped connections during roaming, while excessive overlap can increase co-channel interference between APs operating on the same channel.
99. Frage
When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?
Antwort: B
Begründung:
In the 802.11 wireless networking protocols, when a client station sends a broadcast probe request frame with a wildcard SSID (Service Set Identifier), it is essentially asking for any nearby access points (APs) to identify themselves. The way APs respond to such a probe request is governed by standard 802.11 behavior, which includes:
* Probe Request Handling: Upon receiving a broadcast probe request, each AP that can serve the client prepares a probe response. The response includes information about the AP, such as its SSID, supported data rates, and other capabilities.
* Contention-Based Mechanism: Wireless networks use a contention-based mechanism (CSMA/CA - Carrier Sense Multiple Access with Collision Avoidance) for medium access. Each AP must wait for a clear channel and win the contention process before it can send its probe response.
* Independent Responses: Each AP operates independently in responding to the probe request. There is no coordination between APs to decide which one responds first or at all, leading to multiple APs sending probe responses, each after winning the contention for the medium.
Option A accurately reflects this process, indicating that each AP prepares and sends a probe response in turn, contingent upon winning the medium contention. The other options suggest mechanisms (such as coordination with a DHCP server or simultaneous responses after a Short Interframe Space (SIFS)) that do not align with standard 802.11 procedures for handling broadcast probe requests.
References:
* IEEE 802.11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.
* CWNA Certified Wireless Network Administrator Official Study Guide: Exam PW0-105, by David D.
Coleman and David A. Westcott.
100. Frage
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