N10-005 · Question #407
The network administrator just upgraded all of the WAPs to new ones with 2.4 GHz b/g/n support. The new WAPs reuse the same location and channel as the previous one and with no new external…
The correct answer is B. Use only 20 MHz channel bandwidth. 802.11n supports 40 MHz channel bonding, which in the 2.4 GHz band causes significant co-channel interference. The 2.4 GHz band only has three non-overlapping 20 MHz channels (1, 6, 11). When 40 MHz bonding is used, each channel consumes two of those non-overlapping channels…
Question
The network administrator just upgraded all of the WAPs to new ones with 2.4 GHz b/g/n support. The new WAPs reuse the same location and channel as the previous one and with no new external interference detected. However, performance issues are now occurring that did not exist before. Which of the following would correct the issue?
Options
- AConfigure Wi-Fi Multimedia support
- BUse only 20 MHz channel bandwidth
- CEnable band steering to use 802.11n
- DConfigure Quality of Service
How the community answered
(36 responses)- A6% (2)
- B81% (29)
- C3% (1)
- D11% (4)
Explanation
802.11n supports 40 MHz channel bonding, which in the 2.4 GHz band causes significant co-channel interference. The 2.4 GHz band only has three non-overlapping 20 MHz channels (1, 6, 11). When 40 MHz bonding is used, each channel consumes two of those non-overlapping channels, causing them to overlap with each other. Restricting channel bandwidth to 20 MHz restores the three non-overlapping channels and eliminates the interference introduced by the new 802.11n-capable WAPs.
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