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System Design Quiz Practice
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System Design
Why does Zoom use a Selective Forwarding Unit (SFU) instead of a Multipoint Control Unit (MCU)?
A
Because MCUs are banned under international telecom laws
B
An SFU forwards raw video packets without decoding/re-encoding, achieving sub-150ms latency and requiring minimal server CPU compared to heavy MCU transcoding bridges
C
Because SFUs only work on mobile phones
D
Because MCUs cannot support audio
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