COMPTIA A+ Practice Exam

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Ace your COMPTIA A+ certification with our practice exam. Engage with a variety of questions including multiple choice and performance-based, complete with hints and detailed explanations. Prepare effectively and boost your confidence for the big day!

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Which technology does 802.11n use for multiple connections?

OFDM
Beamforming
MIMO
CDMA

The correct answer is: MIMO

The correct answer is MIMO, which stands for Multiple Input Multiple Output. This technology is fundamental to the operation of 802.11n wireless networks as it allows multiple antennas to be used both at the transmitter and receiver ends. By utilizing multiple pathways for data transmission, MIMO increases the throughput and range of wireless connections, significantly improving performance compared to earlier Wi-Fi standards. MIMO works by taking advantage of multipath propagation, where signals reflect off surfaces and arrive at the receiver through different paths. This capability not only enhances data transfer speeds but also improves reliability and enables more users to connect simultaneously without experiencing interference. While options like OFDM (Orthogonal Frequency-Division Multiplexing) and Beamforming are important technologies also utilized in 802.11n, they serve different specific purposes. OFDM is used to manage the data streams over radio frequencies, contributing to higher data rates and better efficiency. Beamforming enhances signal directionality to improve connection quality but doesn't inherently create separate connections like MIMO does. CDMA (Code Division Multiple Access) is a different multiple access method used in mobile communications and is not directly related to 802.11n technologies.