Modulation and Coding JN0-452 Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   A university is upgrading its Wi-Fi to 802.11ax. The network team has two conflicting goals: maximize throughput for a few high-performance research workstations and ensure reliable connectivity for hundreds of IoT sensors spread across a large campus. The team is considering using OFDMA and MU-MIMO. What is the most balanced approach?

   • AEnable OFDMA to efficiently serve the many low-data-rate IoT sensors, while allowing high-MCS transmissions for the workstations.
   • BConfigure all clients to use the same MCS to ensure fairness.
   • CDisable OFDMA and MU-MIMO to keep the network simple and reduce overhead.
   • DEnable MU-MIMO only, as it is the primary feature for improving throughput in 802.11ax.
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2. 7application · medium

   A stadium IT team is deploying Wi-Fi for a large concert. They expect high client density and heavy uplink social media usage. The RF environment is clean with high SNR, but the team is concerned about interference from the lighting system. What is the most appropriate strategy to maximize aggregate throughput?

   • ADisable lower data rates (e.g., 6, 9, 12 Mbps) to force all clients to use higher modulations and free up airtime.
   • BUse only 20 MHz channels to reduce interference from lighting and increase the number of available channels.
   • CConfigure all APs to use 1024-QAM with a 5/6 coding rate to ensure maximum data rates for every client.
   • DEnable band steering to push capable clients to 5 GHz and rely on dynamic MCS selection to adapt to each client's SNR.
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4. 8foundation · easy

   Which factor most directly influences the choice of MCS in a Wi-Fi network?

   • ANumber of connected clients
   • BSignal-to-noise ratio (SNR)
   • CMAC address of the access point
   • DSSID name
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5. 9foundation · easy

   How does using a lower MCS index affect the actual throughput of a Wi-Fi link?

   • AIt has no effect on throughput because MCS only affects error correction
   • BIt increases the raw data rate because lower MCS uses wider channels
   • CIt reduces the raw data rate but can improve reliability, potentially reducing retransmissions
   • DIt always decreases throughput even in noisy environments
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6. 10foundation · easy

   In Wi-Fi, what does a coding rate of 5/6 indicate?

   • AThe transmission uses 5 out of 6 available spatial streams
   • BThe signal can tolerate 5 errors out of every 6 bits
   • CFor every 5 bits transmitted, 6 bits are actual data
   • DFor every 6 bits transmitted, 5 bits are actual data and 1 bit is redundant overhead
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