Table of Contents
Question
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. The clients that must support OFDMA must also be upgraded to 802.11ax
B. OFDMA is an optional feature of 802.11ax and most APs don’t even support it
C. All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
D. If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
Answer
A. The clients that must support OFDMA must also be upgraded to 802.11ax
Explanation
In response to the customer’s statement that it is essential for most of the clients to use the OFDMA (Orthogonal Frequency Division Multiple Access) modulation scheme in the implemented 802.11ax WLAN, the most appropriate answer is:
A. The clients that must support OFDMA must also be upgraded to 802.11ax.
OFDMA is a key feature of the 802.11ax (also known as Wi-Fi 6) standard. It allows for efficient resource allocation and enables simultaneous communication with multiple clients by dividing the available channel into smaller sub-channels called Resource Units (RUs). However, for clients to benefit from OFDMA, they must support the 802.11ax standard as well.
Option B. OFDMA is an optional feature of 802.11ax and most APs don’t even support it is incorrect. OFDMA is a fundamental feature of 802.11ax, and most modern 802.11ax access points (APs) do support it. It is not an optional feature but a significant improvement introduced in the 802.11ax standard.
Option C. All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz is incorrect. While it is true that all 5 GHz PHYs (Physical Layer) use OFDM (Orthogonal Frequency Division Multiplexing) modulation, OFDMA is a specific feature within the 802.11ax standard that enhances the utilization of the channel by dividing it into sub-channels. Simply using OFDM modulation in 5 GHz does not guarantee OFDMA support.
Option D. If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades is incorrect. 802.11ac is the previous Wi-Fi standard, and it does not inherently support OFDMA. OFDMA is introduced in the 802.11ax standard. Upgrading the device drivers of 802.11ac devices would not enable them to support OFDMA.
Therefore, the correct response is to inform the customer that the clients that must support OFDMA must also be upgraded to 802.11ax, as OFDMA is a feature specific to the 802.11ax standard.
Reference
- Products – IEEE 802.11ax: The Sixth Generation of Wi-Fi White Paper – Cisco
- Wi-Fi 6 (802.11ax) Technical Guide – Cisco Meraki
- What Is OFDMA? – Cisco
- OFDMA – A Guide to the 802.11ax Technology – Home Network Community (tp-link.com)
- Why is OFDMA One of the Most Important Features in 802.11ax? (extremenetworks.com)
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