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300-360 · Question #240
300-360 Question #240: Real Exam Question with Answer & Explanation
The correct answer is B: 40 MHz. 802.11n (Wi-Fi 4) supports two channel widths: 20 MHz and 40 MHz. The 40 MHz option is achieved by bonding two adjacent 20 MHz channels, doubling throughput compared to 20 MHz alone. Subsequent standards expanded this further - 802.11ac (Wi-Fi 5) added 80 MHz and 160 MHz channel
Question
Which value is the max channel width of the 802.11n protocol?
Options
- A20 MHz
- B40 MHz
- C60 MHz
- D80 MHz
Explanation
802.11n (Wi-Fi 4) supports two channel widths: 20 MHz and 40 MHz. The 40 MHz option is achieved by bonding two adjacent 20 MHz channels, doubling throughput compared to 20 MHz alone. Subsequent standards expanded this further - 802.11ac (Wi-Fi 5) added 80 MHz and 160 MHz channel widths. Options C (60 MHz) and D (80 MHz) are not valid for 802.11n.
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