300-360 Question #71: Real Exam Question with Answer & Explanation

The correct answer is A: 18 Mbps and higher should be supported.. To support only 802.11g/n and optimize for voice, two key rate configurations apply. First, 12 Mbps should be set as the lowest mandatory rate (Answer G). Making 12 Mbps mandatory disables support for 802.11b-only data rates (1, 2, 5.5, and 11 Mbps), effectively preventing legacy

Question

An engineer is configuring a new VoWLAN and wants only IEEE 802.11g/n to be supported. Which two data rates should be configured? (Choose two.)

Options

A18 Mbps and higher should be supported.
BLower than 24 Mbps should be supported.
CLower than 24 Mbps should be supported.
D1, 2, 5.5, and 11 Mbps should be disabled.
E11 Mbps should be mandatory.
F6 and 9 Mbps should be supported
G12 Mbps should be mandatory.

Explanation

To support only 802.11g/n and optimize for voice, two key rate configurations apply. First, 12 Mbps should be set as the lowest mandatory rate (Answer G). Making 12 Mbps mandatory disables support for 802.11b-only data rates (1, 2, 5.5, and 11 Mbps), effectively preventing legacy 802.11b clients from associating. Second, 18 Mbps and higher rates should be supported (Answer A). This ensures sufficient throughput headroom for voice traffic while keeping 12 Mbps as the fallback mandatory rate. Setting 12 Mbps as mandatory is the Cisco-recommended baseline for 802.11g/n-only voice deployments because it preserves backward compatibility with early 802.11g devices while excluding 802.11b. Setting the mandatory rate too high (e.g., 24 Mbps) would shrink the voice coverage area.

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