You have implemented an 802.11ax WLAN for a customer. All APs are four stream HE APs. The customer states that it is essential that most of the clients can use the OFDMA modulation scheme. What do you tell the customer?
A.
All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
B.
If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
C.
OFDMA is an optional feature of 802.11ax and most APs don’t even support it
D.
The clients that must support OFDMA must be using an 802.11ax or Wi-Fi 6/6E chipset
The correct answer is:
D. The clients that must support OFDMA must be using an 802.11ax or Wi-Fi 6/6E chipset
Explanation: OFDMA (Orthogonal Frequency Division Multiple Access) is one of the key features of 802.11ax (Wi-Fi 6/6E). It allows the network to divide channels into smaller sub-channels and allocate them to multiple devices, improving network efficiency and performance, especially in high-density environments.
However, for clients to take advantage of OFDMA, they must support 802.11ax or Wi-Fi 6/6E chipsets. Legacy clients (e.g., those using 802.11ac, 802.11n, etc.) will not be able to use OFDMA, even if the AP supports it. Simply updating drivers on older devices (like those with 802.11ac chipsets) will not enable them to support OFDMA, as it requires hardware support built into the chipset.
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