ACMA Wireless Fundamentals 4

Question 1

What does RSSI measure in a wireless network?

Accepted Answer

The relative strength of a received wireless signal

Answer

RSSI (Received Signal Strength Indicator) is a relative measurement of the power level of a received wireless signal.

Question 2

Which technology allows multiple antennas to transmit and receive simultaneously in 802.11n and later, improving throughput?

Accepted Answer

MIMO

Answer

MIMO (Multiple Input Multiple Output) uses multiple antennas to send and receive multiple data streams simultaneously, increasing throughput.

Question 3

What is the purpose of a Beacon frame in 802.11 wireless networks?

Accepted Answer

To periodically advertise the BSS and its capabilities

Answer

Beacon frames are periodically broadcast by APs to advertise the SSID, supported rates, and other BSS parameters.

Question 4

What SNR (Signal-to-Noise Ratio) value in dB is generally considered the minimum for reliable VoIP over Wi-Fi?

Accepted Answer

25 dB

Answer

An SNR of at least 25 dB is generally recommended for reliable VoIP traffic over Wi-Fi to ensure acceptable call quality.

Question 5

Which channel bonding technique doubles the channel width from 20 MHz to 40 MHz in the 5 GHz band?

Accepted Answer

Channel bonding

Answer

Channel bonding combines two adjacent 20 MHz channels into a 40 MHz channel, nearly doubling maximum throughput.

(ACMA) Aruba Certified Mobility Associate Practice Test