ACA Wireless Technologies 2

Question 1

Which IEEE 802.11 amendment introduced OFDMA as a key feature to improve multi-user efficiency?

Accepted Answer

802.11ax

Answer

802.11ax (Wi-Fi 6) introduced OFDMA (Orthogonal Frequency Division Multiple Access) to allow simultaneous transmission to multiple clients.

Question 2

What is the primary purpose of a BSSID in a wireless network?

Accepted Answer

Uniquely identifies an access point's radio interface using its MAC address

Answer

A BSSID (Basic Service Set Identifier) is the MAC address of the AP's radio interface and uniquely identifies that BSS.

Question 3

In Aruba's architecture, which component is responsible for centralized WLAN control when using controller-based deployment?

Accepted Answer

Aruba Mobility Controller

Answer

Aruba Mobility Controller acts as the centralized WLAN controller, managing APs and enforcing policies in a controller-based deployment.

Question 4

Which wireless frequency band is most susceptible to interference from microwave ovens and Bluetooth devices?

Accepted Answer

2.4 GHz

Answer

The 2.4 GHz band is heavily used by microwave ovens, Bluetooth, and other consumer devices, causing frequent interference.

Question 5

What does the term 'roaming' refer to in a wireless LAN environment?

Accepted Answer

A client moving between APs while maintaining network connectivity

Answer

Roaming is the process by which a wireless client transitions from one AP to another without losing network connectivity.

(ACA) Aruba Certified Associate Certification Practice Test