CWNA: Certified Wireless Network Administrator v109 — Question 8

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 with one of each radio operational. 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 invalid because the AP will compress all data before transmitting it onto the Ethernet link.
• B. 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 Gbps Ethernet link.
• C. His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.
• D. His concern is valid and the company should upgrade all Ethernet links to 10 Gbps immediately.

Correct answer: B

Explanation

The correct answer is B because the 802.11 protocol dynamically adjusts the data rates based on the network conditions and the capabilities of connected devices, making it unlikely to exceed 1 Gbps. Options A, C, and D are incorrect as they either misunderstand the network's operational capacity or suggest unnecessary upgrades.