NCTI WIFI Practice Exam (100% Correct) Graded A+ |Verified| 2025
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NCTI
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NCTI
NCTI WIFI Practice Exam (100% Correct)
Graded A+ |Verified| 2025
2.4 GHz provides better coverage over longer distances but lower speeds, while
faster speeds but a shorter range.
5 GHz offers
Why is it recommended to use different SSIDs for 2.4 GHz and 5 GHz networks in a dual-band ...
NCTI WIFI Practice Exam (100% Correct)
Graded A+ |Verified| 2025
2.4 GHz provides better coverage over longer distances but lower speeds, while 5 GHz offers
faster speeds but a shorter range.
Why is it recommended to use different SSIDs for 2.4 GHz and 5 GHz networks in a dual-band setup?
Having separate SSIDs helps users manually select the appropriate band, enhancing performance based
on location or task, with 2.4 GHz for range and 5 GHz for speed.
What is the significance of the WiFi standard 802.11ac compared to older versions?
802.11ac allows faster data rates and operates mainly on the 5 GHz band, reducing interference
and supporting multiple devices more efficiently than older standards like 802.11n.
How does MU-MIMO (Multi-User, Multiple Input, Multiple Output) improve WiFi performance?
MU-MIMO allows a router to communicate with multiple devices simultaneously, leading to more
efficient network usage and reducing latency in multi-device environments.
In terms of WiFi security, why is WPA3 considered more secure than WPA2?
WPA3 enhances encryption strength, simplifies the connection process for devices without screens, and
offers better protection against brute-force attacks compared to WPA2.
Describe how channel bonding works and its effect on WiFi performance.
Channel bonding merges two adjacent channels to create a wider bandwidth, which increases data
throughput. However, it may also increase interference, especially in the 2.4 GHz band.
How do environmental factors like walls and furniture affect WiFi signals?
Physical obstacles such as walls, furniture, and appliances weaken WiFi signals, particularly on the
5 GHz band, which is more sensitive to interference compared to 2.4 GHz.
1
, Why is WiFi 6 (802.11ax) seen as a major advancement over WiFi 5 (802.11ac)?
WiFi 6 enhances speed, increases network efficiency, and reduces congestion, especially in high-density
environments. It introduces OFDMA (Orthogonal Frequency Division Multiple Access) and target
wake time for better battery management.
How does beamforming enhance WiFi performance, particularly for mobile devices?
Beamforming directs the WiFi signal toward specific devices rather than broadcasting it in all directions,
improving the strength and reliability of the connection, especially on 5 GHz networks.
What is the purpose of a WiFi mesh network, and how does it differ from using range extenders?
A mesh network consists of multiple nodes that create a seamless coverage area, whereas range
extenders create separate networks. Mesh networks maintain a single SSID and provide more
stable and broader coverage.
Why do some older devices have issues connecting to newer WiFi standards?
Older devices may lack support for new WiFi protocols or frequencies, such as the 5 GHz band or the
security requirements of WPA3, leading to connectivity issues. Updating the device or using legacy
settings may help.
What is DFS (Dynamic Frequency Selection) and why is it important in certain WiFi environments?
DFS enables WiFi networks to automatically switch to different frequencies to avoid interference with
radar systems, especially in the 5 GHz band, enhancing signal stability.
Explain the concept of WiFi roaming and how it benefits mobile users.
WiFi roaming allows a device to switch between access points within the same network as the user
moves, providing continuous connectivity without manual intervention or loss of signal, typically in
large, multi-router setups.
How does WiFi interference from neighboring networks affect performance, and how can it be
minimized?
WiFi interference occurs when multiple networks operate on the same or overlapping channels, slowing
down the connection. Changing channels or using 5 GHz can help reduce this interference.
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