You are a wireless network administrator at an outdoor container yard. A new multicast application that communicates with the GPS on the container handling equipment is being added to the network…

Question

Options

• AIncrease the basic rate from 6 to 24 Mbps.
• BMulticast Transmission Optimization
• CDynamic Multicast Optimization
• DEnable WiFi Multimedia.

• A
  6% (3)
• B
  4% (2)
• C
  77% (36)
• D
  13% (6)

Explanation

Dynamic Multicast Optimization (DMO) solves the core problem with wireless multicast: by default, multicast frames are transmitted at the lowest basic rate (no ACKs, no rate adaptation), which wastes airtime and reduces reliability. DMO converts the multicast stream into individual unicast transmissions for each associated client, enabling per-client rate adaptation and ACK/retransmission - delivering both maximum data rate and higher reliability.

Why the distractors fail:

• A (Increase basic rate to 24 Mbps): Raising the basic rate forces multicast and management frames to 24 Mbps, but clients with weaker signals can't decode those frames - harming range and reliability, not helping it.
• B (Multicast Transmission Optimization): This is a plausible-sounding but fabricated distractor; no standard Wi-Fi feature uses this exact name.
• D (WiFi Multimedia/WMM): WMM is a QoS mechanism that prioritizes traffic categories but does nothing to convert multicast to unicast or improve multicast data rates.

Memory tip: DMO = "multicast goes Door-to-Door." Instead of shouting one announcement at the lowest volume everyone can hear (broadcast multicast), DMO delivers a personal message to each device at the fastest speed that device supports.

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