CompTIA A+ Core 1 (220-1001) — Question 299

As part of a wireless network upgrade, a home user replaced an older 802.11g WAP with one that only works on 802.11ac. Consequently, many network devices can no longer connect. Which of the following is the MOST likely reason?

Answer options

• A. The old devices require a WAP capable of supporting MIMO.
• B. The new WAP is not broadcasting its SSID.
• C. The new WAP uses WPA2, which is not compatible with the 802.11g devices.
• D. 802.11ac only operates on 5GHz, and the user has many 2.4GHz devices.

Correct answer: D

Explanation

The correct answer is D because 802.11ac primarily operates on the 5GHz band, which is not compatible with older 2.4GHz-only devices. Option A is incorrect because MIMO is supported by both standards. Option B is not likely the cause since the new WAP should still allow connections even if the SSID is not broadcasted. Option C is also incorrect because WPA2 is backward compatible with 802.11g devices.