Every dual-band router sold since 2009 has advertised two radios as a feature. Until WiFi 7, those two radios could not cooperate to serve a single device. Each client connected to one band or the other — not both. Multi-Link Operation, the defining architectural feature of WiFi 7, changes that constraint fundamentally. What Dual-Band Actually Meant Before WiFi 7 A dual-band WiFi 5 or WiFi 6 router presents two separate wireless networks: one on 2.