A customer wants to trade in older 802.11a/b/g access points for new 802.11n access points. What must be considered before deploying new 802.11n access points?

Question

Options

• AFewer APs are needed because 802.11n runs on a different radio frequency.
• BFewer access points are needed because 802.11n has better coverage.
• C5-GHz coverage is needed when expecting 300-450 Mbps client link.
• DNew APs should bundle channels 1, 6, and 11 to increase throughput to 150 Mbps.

• B
  4% (1)
• C
  88% (23)
• D
  8% (2)

Explanation

To achieve the advertised 300–450 Mbps 802.11n throughput, 5 GHz operation with 40 MHz channel bonding is required. On 2.4 GHz there are only three non-overlapping 20 MHz channels (1, 6, 11); bonding two of them into a 40 MHz channel would consume the entire 2.4 GHz band and cause severe co-channel interference in any multi-AP environment. The 5 GHz band has enough non-overlapping channels to support 40 MHz bonding without this problem. Option A is false - 802.11n uses the same 2.4 GHz and 5 GHz frequencies as its predecessors. Option B is misleading - coverage area does not automatically decrease AP count. Option D is incorrect - channels 1, 6, and 11 are separate non-overlapping channels, not bonded together, and bonding them is not how 802.11n throughput is achieved.

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