How wide is each of the three WLAN Unlicensed National Information Infrastructure (U-NII) bands?

The correct answer indicates that each of the three WLAN Unlicensed National Information Infrastructure (U-NII) bands has a width of 100 megahertz (MHz). This information is crucial for understanding wireless networking, as these bands are specifically allocated for unlicensed use, allowing devices such as routers and access points to operate without requiring a special licensing process.

Each U-NII band is defined to provide sufficient bandwidth for various applications, facilitating better performance and data transmission for devices operating within these bands. The allocation of 100 MHz per band helps to minimize interference and maximize throughput in wireless communications, which is essential for applications like streaming, online gaming, and high-speed internet access.

The other options suggest widths that do not correspond to the specifications set for the U-NII bands. A narrower width like 50 MHz would limit the channel throughput and increase the likelihood of interference, while significantly wider options such as 200 MHz or 300 MHz surpass the regulatory constraints and available bandwidth defined for each U-NII band. Recognizing the correct bandwidth is critical for designing and optimizing wireless networks effectively.