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…

OFDMA is a new modulation scheme introduced in 802.11ax that allows multiple users to share the

same channel by dividing it into smaller subchannels called resource units (RUs). This improves the

efficiency and capacity of the WLAN by reducing contention and overhead. However, to use OFDMA,

both the AP and the client must support 802.11ax and negotiate the parameters of the subchannel

allocation. Therefore, the customer needs to upgrade the clients that require OFDMA to 802.11ax

devices12.

The other options are not correct because they do not reflect the reality of OFDMA. Option B is

incorrect because OFDMA is a mandatory feature of 802.11ax for both downlink and uplink

transmissions, and all 802.11ax APs must support it1. Option C is incorrect because OFDM and

OFDMA are different modulation schemes, and OFDM does not allow multiple users to share the

same channel. Option D is incorrect because 802.11ac devices cannot support OFDMA through driver

upgrades, as they lack the hardware and firmware capabilities to do so2.

Reference: 1: CWNA-109 Official Study Guide, page 144 2: OFDMA