Wireless Technologies Flashcards

What is the function of the Aruba AP's 'air monitor' mode?

Answer: It passively monitors the RF environment without serving clients

An Aruba AP in air monitor (AM) mode scans the RF environment for rogue APs and interference without serving client traffic.

Which 802.11 power management feature allows an AP to buffer frames for sleeping clients and notify them via TIM?

Answer: Legacy Power Save (PS-Poll)

Legacy Power Save uses PS-Poll frames; the AP buffers frames and uses the Traffic Indication Map (TIM) in beacons to alert sleeping clients.

In an Aruba network, what protocol is used between a campus AP and a Mobility Controller to tunnel client traffic?

Answer: GRE

Aruba uses GRE (Generic Routing Encapsulation) tunnels between APs and the Mobility Controller to carry client traffic centrally.

What is the role of a Spectrum Analyzer in wireless network troubleshooting?

Answer: It identifies non-802.11 RF interference sources in the spectrum

A spectrum analyzer identifies non-802.11 RF sources such as microwave ovens, cordless phones, and Bluetooth that cause interference.

Which 802.11 frame type is responsible for carrying user data between a wireless client and an AP?

Answer: Data frames

Data frames carry actual user payload (such as IP packets) between wireless clients and the AP.

What is the primary advantage of MU-MIMO (Multi-User MIMO) over SU-MIMO?

Answer: It allows the AP to transmit to multiple clients simultaneously

MU-MIMO allows an AP to transmit to multiple clients at the same time using spatial multiplexing, increasing total network efficiency.

In WPA3-Enterprise, which security improvement over WPA2-Enterprise is mandatory?

Answer: 192-bit minimum security suite (CNSA)

WPA3-Enterprise mandates a 192-bit security suite aligned with CNSA (Commercial National Security Algorithm) for higher-assurance networks.