CWNA: Certified Wireless Network Administrator v107 — Question 28

You support a WLAN using dual-band 802.11ac three stream access points. All access points have both the 2.4 GHz and 5 GHz radios enabled and use 40 MHz channels in 5 GHz and 20 MHz channels in 2.4 GHz. A manager is concerned about the fact that each access point is connected using a 1 Gbps Ethernet link. He is concerned that the Ethernet link will not be able to handle the load from the wireless radios. What do you tell him?

Answer options

• A. His concern is valid and the company should upgrade all Ethernet links to 10 Gbps immediately.
• B. His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.
• C. His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.
• D. Due to 802.11 network operations and the dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gpbs Ethernet link.

Correct answer: A

Explanation

The correct answer is A because the combined throughput of the dual-band access points can exceed the capacity of a 1 Gbps Ethernet link, especially in high-demand environments. Options B, C, and D present flawed reasoning; adding a second link or relying on data compression does not adequately resolve the potential bottleneck, and the dynamic rates in a wireless setup can easily lead to congestion on a single 1 Gbps link.