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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN Network Architecture and Design Concepts | 15% | - Network design principles
|
| Topic 2: Radio Frequency (RF) Technologies | 20% | - RF fundamentals and behavior
|
| Topic 3: WLAN Protocols and Devices | 20% | - 802.11 frame types and formats
|
| Topic 4: WLAN Regulations and Standards | 15% | - Regulatory bodies and frequency bands
|
| Topic 5: WLAN Troubleshooting and Management | 15% | - Performance and connectivity issues
|
| Topic 6: WLAN Network Security | 15% | - Authentication and encryption
|
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NEW QUESTION # 139
What field within a Beacon frame is used to inform sleeping stations that the AP has buffered broadcast or multicast traffic to be delivered?
Answer: A
Explanation:
The Traffic Indication Map (TIM) is a field included in every Beacon frame that indicates which associated stations, identified by their Association ID, have buffered unicast frames waiting at the AP. A special variant, the Delivery Traffic Indication Map (DTIM), is sent at a configured interval and informs stations that buffered broadcast or multicast traffic will be delivered following that particular beacon. Stations in power save mode wake periodically to check the TIM/DTIM and determine whether they need to retrieve buffered data.
NEW QUESTION # 140
You were previously onsite at XYZ's facility to conduct a pre-deployment RF site survey. The WLAN has been deployed according to your recommendations and you are onsite again to perform a post- deployment validation survey.
When performing this type of post-deployment RF site survey voice over Wi-Fi, what is an action that must be performed?
Answer: C
Explanation:
When performing a post-deployment validation survey for voice over Wi-Fi (VoWiFi), an action that must be performed is Application analysis with an active phone call on a VoWiFi handset.
Application analysis is a method of testing the performance of a specific application over the WLAN by measuring parameters such as throughput, latency, jitter, packet loss, MOS score, and R-value. Application analysis with an active phone call on a VoWiFi handset can help to evaluate the quality of service (QoS) and user experience of VoWiFi calls over the WLAN. It can also help to identify any issues or bottlenecks that may affect VoWiFi calls such as interference, roaming delays, or insufficient coverage.
NEW QUESTION # 141
You administer a WLAN that offers a guest SSID of GUESTNWORK. Users connect to the GUESTNWORK SSID, but report that they cannot browse the Internet. The devices simply report no Internet connection. What common problem causes this scenario?
Answer: C
Explanation:
A common problem that causes this scenario is captive portal issues. A captive portal is a web page that requires users to authenticate or accept terms and conditions before accessing the Internet through a WLAN. A captive portal is often used for guest networks to provide security and control over the network access. A captive portal works by intercepting the user's web requests and redirecting them to the portal page until the user completes the required action. However, sometimes the captive portal may not work properly due to various reasons, such as browser settings, firewall rules, DNS configuration, or network errors. This can prevent the user from browsing the Internet or seeing the portal page. To troubleshoot captive portal issues, you can try to use a different browser, clear the browser cache andcookies, disable any VPN or proxy settings, manually enter the portal URL, or contact the network administrator. NTP issues, hardware issues, or IP routing issues are not common problems that cause this scenario. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 343; [CWNA: Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 333.
NEW QUESTION # 142
What can an impedance mismatch in the RF cables and connectors cause?
Answer: D
Explanation:
VSWR stands for Voltage Standing Wave Ratio, which is a measure of how well the impedance of the RF cable and connectors matches the impedance of the transmitter and the antenna. Impedance is the opposition to the flow of alternating current in an RF circuit, and it depends on the frequency, resistance, capacitance, and inductance of the components. A perfect impedance match would have a VSWR of 1:1, meaning that all the power is transferred from the transmitter to the antenna, and none is reflected back. However, in reality, there is always some degree of mismatch, which causes some power to be reflected back to the transmitter, creating standing waves along the cable. This reduces the efficiency and performance of the wireless system, and can also damage the transmitter. Excessive VSWR can be caused by using poor quality or damaged cables and connectors, or by using components that have different impedance ratings123. References: CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 90; CWNA-109Study Guide, Chapter 2: Radio Frequency Fundamentals, page 86; CWNP website, CWNA Certification.
NEW QUESTION # 143
In a long-distance RF link, what statement about Fade Margin is true?
Answer: C
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 # 144
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