📖 15. Wireless LANs

📖 From Data Communication and Networks • 168 questions available

About 15. Wireless LANs

Wireless LANs based on IEEE 802.11 standards enable mobile connectivity within buildings through radio-based CSMA/CA protocols adapted for half-duplex shared spectrum. Evolution from 802.11b/g/n/ac to Wi-Fi 6/6E/7 introduced OFDM, MIMO, beamforming, and OFDMA to combat multipath fading, increase spectral efficiency, and support dense deployments, transforming Wi-Fi from a convenience feature into primary enterprise access infrastructure capable of gigabit throughput and low-latency applications.

Security evolved from broken WEP to robust WPA3 with SAE handshake and forward secrecy, addressing wireless-specific vulnerabilities like eavesdropping and rogue access points. Site surveys, channel planning, and controller-based architectures manage RF propagation challenges absent in wired networks, while emerging standards like Wi-Fi Sensing and HaLow extend functionality beyond data transport, positioning WLANs as pervasive sensing and IoT platforms alongside traditional connectivity roles.

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🔄 Last updated: 2026-08-01