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>> CWNA-109 Exam Cram Questions <<
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NEW QUESTION # 122
What statement about 802.11 WLAN performance is true?
Answer: C
Explanation:
The statement that in modern networks, both centralized and distributed data forwarding work well for most standard office deployments is true about WLAN performance. Data forwarding refers to how wireless frames are transmitted from wireless clients to wired networks or vice versa through wireless access points (APs). Centralized data forwarding means that all wireless frames are sent to a central controller or gateway before being forwarded to their destinations.
Distributed data forwarding means that wireless frames are forwarded directly by the APs to their destinations without going through a central controller or gateway. Both methods have their advantages and disadvantages, depending on the network size, topology, traffic pattern, security, and management requirements. However, in modern networks, both methods can achieve high performance and scalability for most standard office deployments, as they can leverage advanced features such as fast roaming, load balancing, quality of service, and encryption. The other statements about WLAN performance are false. In most WLANs, special skill or tuning is required to get peak performance, such as selecting the appropriate channel, power, data rate, and antenna settings. WLANs perform worse as more wireless clients connect with each AP, as they cause more contention and interference on the wireless medium. To get the best performance out of an AP, you should not disable data rates of 72 Mbps and lower, as they are needed for backward compatibility and range extension.
NEW QUESTION # 123
What feature of 802.1 lax (HE) may impact design decisions related to AP placement and the spacing between same-channel BSS cells (3SAs) because it is designed to reduce overlapping BSS contention?
Answer: C
Explanation:
In the 802.11ax (High Efficiency, HE) amendment, one of the key features introduced is BSS (Basic Service Set) Coloring. This feature is designed to mitigate issues arising from overlapping BSSs (OBSS), which can lead to contention and interference in dense wireless environments. BSS Coloring works by:
* Assigning a "color" (a small number) to each BSS: This helps devices differentiate between frames from their own BSS and those from neighboring BSSs.
* Reducing Inter-BSS Interference: Devices can ignore frames from different BSSs (with a different
"color") under certain conditions, reducing the impact of OBSS interference.
* Improving Spatial Reuse: By distinguishing between transmissions from different BSSs, devices can make more informed decisions about when to transmit, improving the efficiency of spatial reuse and reducing unnecessary contention.
This feature directly impacts design decisions related to AP placement and the spacing between same-channel BSS cells, as it allows for closer placement of APs on the same channel without significantly increasing interference, thus improving overall network capacity and efficiency.
The other options, while features of 802.11ax, do not directly pertain to reducing overlapping BSS contention in the same manner:
* TWT (Target Wake Time)optimizes device sleep schedules to conserve power.
* Uplink MU-MIMOenhances uplink data transmission capabilities but doesn't specifically address
* OBSS contention.
* 6 GHz Band Supportintroduces new spectrum for Wi-Fi use but is not a feature aimed at reducing OBSS contention within the 802.11ax framework.
Therefore, the correct answer is B, BSS Color.
References:
* IEEE 802.11ax-2021: Enhancements for High Efficiency WLAN.
* CWNA Certified Wireless Network Administrator Official Study Guide: ExamCWNA-109, by David D: Coleman and David A. Westcott.
NEW QUESTION # 124
Which regulatory domain organization is responsible for defining RF power and channel regulations for WLAN devices operating in the United States?
Answer: D
Explanation:
The Federal Communications Commission (FCC) is the regulatory body responsible for governing the use of RF spectrum in the United States, including the unlicensed ISM and U-NII bands used by WLAN devices. The FCC establishes rules regarding maximum transmit power, permissible channels, and technical requirements that WLAN equipment manufacturers must follow. Other countries and regions have their own regulatory bodies, such as ETSI in Europe, which may impose different power and channel restrictions.
NEW QUESTION # 125
When implementing PoE, what role is played by a switch?
Answer: B
Explanation:
PoE stands for Power over Ethernet, which is a technology that allows network devices to receive power and data over the same Ethernet cable. PoE eliminates the need for separate power adapters or outlets for devices such as IP phones, cameras, or APs. PoE requires two types of devices: PSE (Power Sourcing Equipment) and PD (Powered Device). A PSE is a device that provides power to the Ethernet cable, such as a switch, injector, or splitter. A PD is a device that receives power from the Ethernet cable, such as an IP phone, camera, or AP. When implementing PoE, a switch plays the role of a PSE910. References: CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 293; CWNA-109Study Guide, Chapter 7: Power over Ethernet (PoE), page 287.
NEW QUESTION # 126
A wireless engineer is troubleshooting an area where far-away clients associated with an AP experience poor performance because a nearby client is transmitting at a much higher signal level, effectively drowning out the weaker signal at the receiver. What is this condition called?
Answer: D
Explanation:
The near/far problem occurs when a client station located close to an access point transmits at a much higher received signal strength than a client station located farther away. This disparity can cause the AP's receiver to have difficulty properly receiving the weaker, distant signal, particularly if the strong nearby signal is transmitting at the same time or causing elevated noise levels. This can effectively "drown out" the distant client, resulting in poor performance or connectivity issues for stations farther from the AP.
NEW QUESTION # 127
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