N10-005 Question #962: Real Exam Question with Answer & Explanation

The correct answer is B: 802.11b at 1Mbps. Range and data rate have an inverse relationship in wireless: lower data rates use simpler, more robust modulation schemes that can be decoded at much greater distances and through more interference. 802.11b at its lowest rate (1Mbps) uses DBPSK modulation, which provides the max

Question

A user needs maximum distance in a wireless connection. Which of the following should be configured to meet this goal?

Options

A802.11a at 54Mbps
B802.11b at 1Mbps
C802.11g at 11Mbps
D802.11n at 130Mbps

Explanation

Range and data rate have an inverse relationship in wireless: lower data rates use simpler, more robust modulation schemes that can be decoded at much greater distances and through more interference. 802.11b at its lowest rate (1Mbps) uses DBPSK modulation, which provides the maximum possible range of all the listed options. Although 802.11n generally offers greater range than 802.11b at its higher rates, 802.11b at 1Mbps out-ranges any of the options listed by falling back to the most noise-tolerant encoding. 802.11a operates in the 5GHz band, which has shorter range than 2.4GHz. Higher data rates (54Mbps, 130Mbps) require stronger signals and are limited to shorter distances.

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