What is a key characteristic of 256-QAM compared to 16-QAM?

256-QAM transmits fewer bits per symbol but is more resistant to noise

256-QAM uses a wider channel bandwidth than 16-QAM

256-QAM is only used in the 2.4 GHz band

256-QAM transmits more bits per symbol but requires a higher SNR to maintain reliability

A network engineer is deploying Wi-Fi in a large open-plan office. The APs are mounted on the ceiling, and clients are spread across the floor. The engineer wants to ensure that clients at the edge of the coverage area can still achieve at least 64-QAM. What is the most important factor to check?

The AP's transmit power setting.

The signal-to-noise ratio (SNR) at the client's location.

The channel width configured on the AP.

The number of spatial streams supported by the client.

In Wi-Fi, how does modulation map data bits to the RF signal?

By assigning each possible combination of bits a unique amplitude and phase state of the carrier

By encoding bits as variations in the signal's transmission time

By changing the frequency of the carrier for each individual bit

By assigning each bit a separate carrier frequency

A technician is using a site survey tool and notices that a client at the edge of the coverage area has an SNR of 15 dB. The client is currently associated at MCS 0 (BPSK 1/2). The technician wants to improve the client's throughput. What is the most effective action?

Increase the AP's transmit power to improve SNR at the client's location.

Change the client's modulation to 256-QAM manually to force higher throughput.

Disable FEC to reduce overhead and allow more data bits per transmission.

Reduce the AP's channel width from 40 MHz to 20 MHz.

Juniper NetworksCertified Specialist, Mist AI Wireless (JNCIS-MistAI)

Domain 1Objective 4

Modulation and Coding JN0-452 Practice Questions (Page 5)

Part of the Wi-Fi Fundamentals domain, which makes up ~20% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~7–12 in this domain), expect 1–2 from this objective — we provide 25 practice questions to prepare you well beyond it. (estimate)

25questions here

5free pages

7concepts

Questions 21–25

21foundation · easy
What is a key characteristic of 256-QAM compared to 16-QAM?
Select an answer first
22application · easy
A junior engineer is looking at a spectrum analyzer and sees a Wi-Fi transmission. The engineer knows the AP is using 16-QAM. How many bits are encoded per symbol in this modulation scheme?
Select an answer first
23application · medium
A network engineer is deploying Wi-Fi in a large open-plan office. The APs are mounted on the ceiling, and clients are spread across the floor. The engineer wants to ensure that clients at the edge of the coverage area can still achieve at least 64-QAM. What is the most important factor to check?
Select an answer first
24foundation · easy
In Wi-Fi, how does modulation map data bits to the RF signal?
Select an answer first
25application · medium
A technician is using a site survey tool and notices that a client at the edge of the coverage area has an SNR of 15 dB. The client is currently associated at MCS 0 (BPSK 1/2). The technician wants to improve the client's throughput. What is the most effective action?
Select an answer first

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