n () introduced MIMO (Multiple Input Multiple Output). MIMO uses multiple antennas to send and receive several data streams simultaneously. This pushed theoretical speeds to Mbps with spatial streams. n operates on both GHz and GHz and introduced MHz channel bonding. Wi-Fi devices remain common today. When you support them, your network must maintain backward compatibility with their older modulation schemes.
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$ curl repovive.com/roadmaps/network-design/wireless-networking/802-11n-wi-fi-4
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