N10-005 Question #704: Real Exam Question with Answer & Explanation

The correct answer is B: 36, 44, 52, 60. In the 5 GHz band, 40 MHz channels are formed by bonding two adjacent 20 MHz channels. The non-overlapping 40 MHz channel pairs in the UNII-1 and UNII-2 bands are: 36+40, 44+48, 52+56, and 60+64. The primary channel designators for these pairs are 36, 44, 52, and 60. Option B (36

Question

A network administrator needs to ensure there is no same channel interference for an 802.11n deployment with four WAPs. Which of the following channel setting configurations meets this criteria when using 40 MHz channels?

Options

A36, 40, 44, 48
B36, 44, 52, 60
C36, 44, 48, 52
D36, 48, 60, 64

Explanation

In the 5 GHz band, 40 MHz channels are formed by bonding two adjacent 20 MHz channels. The non-overlapping 40 MHz channel pairs in the UNII-1 and UNII-2 bands are: 36+40, 44+48, 52+56, and 60+64. The primary channel designators for these pairs are 36, 44, 52, and 60. Option B (36, 44, 52, 60) correctly uses all four non-overlapping 40 MHz channels. Option A (36, 40, 44, 48) causes interference because 40 overlaps with the 36+40 pair. Option C (36, 44, 48, 52) fails because 48 is part of the 44+48 pair. Option D (36, 48, 60, 64) is incorrect because 48 is bonded with 44, and 64 is bonded with 60.

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