Wireless Technologies Flashcards

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

Answer: 802.11ax

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

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

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

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

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

Answer: Aruba Mobility Controller

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

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

Answer: 2.4 GHz

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

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

Answer: A client moving between APs while maintaining network connectivity

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

Which authentication framework is most commonly used for enterprise wireless networks to authenticate users against a RADIUS server?

Answer: 802.1X/EAP

802.1X with EAP (Extensible Authentication Protocol) is the standard enterprise authentication framework that integrates with RADIUS servers.

In Wi-Fi 6 (802.11ax), what is the maximum number of spatial streams supported?

Answer: 8

Wi-Fi 6 (802.11ax) supports up to 8 spatial streams for MIMO transmission, doubling the theoretical throughput per radio.