Yes, the Airport Extreme Base Station is a simulatneous dual band (2.4GHz and 5GHz) router with a USB port for networking external hard drives or other usb devices.
yes
In IT field, dual band is associated with the wireless router. This router handles frequency bands of 802.11. Dual band routers support 11a users in 5GHz band and 11b/g users on the band of 2.4GHz.
In the wireless properties choose "compatibility mode for G" or something like that. If you do so your router will allow both types of wireless cards G and N.
no, but very likely less crowded. 5ghz has a somewhat shorter range however.
5GHz with a speed of up to 54Mbps
no it can't be
Wireless standard A and Dual-Band N.
5Ghz
802.11n and 802.11a
Unlike ordinary routers that only support one wireless signal band, dual-band routers contain two different types of wireless radios. When first introduced many years ago, dual-band routers supported both 802.11a and 802.11b
All of Tenda Wifi Routers are created with the network demands of a modern home in mind, but newest AC1900 Smart Dual-Band Gigabit WiFi Router, the AC15, has additional features such as Beamforming+ technology that makes wireless connection faster and more responsive.