ACA Wireless Technologies 3

Question 1

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

Accepted Answer

It passively monitors the RF environment without serving clients

Answer

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

Question 2

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

Accepted Answer

Legacy Power Save (PS-Poll)

Answer

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

Question 3

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

Accepted Answer

GRE

Answer

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

Question 4

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

Accepted Answer

It identifies non-802.11 RF interference sources in the spectrum

Answer

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

Question 5

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

Accepted Answer

Data frames

Answer

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

(ACA) Aruba Certified Associate Certification Practice Test