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NEW QUESTION # 54
Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter. What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?
Answer: A
Explanation:
Return loss is a measure of how well the components of an RF system are matched in terms of their impedance. Impedance is the opposition to the flow of alternating current in a circuit, and it depends on the frequency, resistance, capacitance, and inductance of the components. When the impedance of the source, the transmission line, and the load are not equal, some of the power is reflected back to the source, causing a loss of forward power. This loss is expressed in decibels (dB) as return loss. The higher the return loss, the lower the reflection and the better the impedance matching. Conversely, the lower the return loss, the higher the reflection and the worse the impedance matching.
VSWR (Voltage Standing Wave Ratio) is another way of expressing the same concept. It is the ratio of the maximum voltage to the minimum voltage along a transmission line due to the interference of the incident and reflected waves. A VSWR of 1:1 means that there is no reflection and perfect impedance matching. A VSWR higher than 1:1 means that there is some reflection and impedance mismatch. The higher the VSWR, the higher the reflection and the lower the return loss.
Therefore, a significant impedance mismatch between components in an RF system will cause high reflection, high VSWR, and low return loss.
NEW QUESTION # 55
In a split-MAC architecture, which functions are typically handled by the WLAN controller rather than the access point?
Answer: D
Explanation:
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.
NEW QUESTION # 56
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?
Answer: B
Explanation:
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.
NEW QUESTION # 57
A wireless engineer is troubleshooting a WLAN and observes a high number of retransmissions on a particular access point. What is a likely cause of this issue?
Answer: C
Explanation:
High retransmission rates typically indicate that frames are being corrupted or lost in transit, often due to RF interference, low signal-to-noise ratio (SNR), multipath issues, or co-channel/adjacent channel interference. When a frame is not properly received or fails its Frame Check Sequence (FCS), the receiver does not send an acknowledgment, prompting the sender to retransmit the frame. Excessive retransmissions consume airtime and reduce overall throughput and network capacity, and are a common symptom investigated during WLAN troubleshooting.
NEW QUESTION # 58
You recently purchased four laptops containing dual-band 802.11ac adapters. The laptops can connect to your
2.4 GHz network, but they cannot connect to the 5 GHz network. The laptops do not show the 5 GHz SSIds, which are different than the 2.4 GHz SSIDs. Existing devices can connect to the 5 GHz SSIDs with no difficulty. What is the likely problem?
Answer: A
Explanation:
The likely problem that causes this scenario is faulty drivers. Drivers are software components that enable the communication between the operating system and the hardware devices, such as the wireless adapters. Faulty drivers can cause various issues with the wireless connectivity, such as not detecting or connecting to certain networks, dropping connections, or reducing performance. Faulty drivers can be caused by corrupted files, outdated versions, incompatible settings, or hardware defects. To fix faulty drivers, you can try to update, reinstall, or roll back the drivers, or contact the manufacturer for support. Interference from non-Wi-Fi sources, DoS attack, or interference from other WLANs are not likely to cause this scenario, as they would affect all devices in the same area, not just the new laptops. References: [CWNP Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 562; [CWNA: Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109], page 532.
NEW QUESTION # 59
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