Which option best describes the relationship between the cloud and the fog?

Question

Options

• AData is sent first to the cloud and then to the fog.
• BData is stored in the fog, but not in the cloud.
• CThe fog stores data in the network edge that may or may not be sent to the cloud.
• DThe fog is replacing the cloud.

• A
  4% (1)
• C
  92% (22)
• D
  4% (1)

Explanation

Fog computing extends cloud capabilities to the network edge (routers, gateways, local servers), where data is processed and stored close to where it's generated - and only relevant data is forwarded to the cloud, making C correct.

• A is wrong because the flow is typically reversed: data originates at edge devices, gets processed in the fog first, and may then travel to the cloud - not the other way around.
• B is wrong because fog doesn't exclude cloud storage; both can store data, and fog specifically complements the cloud rather than replacing it.
• D is wrong because fog and cloud are complementary technologies - fog handles latency-sensitive, local processing while the cloud handles large-scale storage and analytics.

Memory tip: Think of fog as "cloud that touches the ground" - just like real fog sits close to Earth's surface, fog computing sits close to the data source (the edge), while the cloud floats higher and handles the bigger picture.

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