Why should a replica be consistent with its source?

Question

Options

• AEnsure the usability of the replica
• BReduce the need to create multiple replicas
• CEnsure the security of the replica
• DReduce the size of the replica

• A
  82% (28)
• B
  3% (1)
• C
  6% (2)
• D
  9% (3)

Explanation

A replica must be consistent with its source to remain usable - if the data diverges, the replica becomes unreliable or incorrect, defeating its entire purpose (backup, load balancing, disaster recovery, etc.). Options B, C, and D are wrong because consistency has no inherent effect on how many replicas are needed, on the security of the data, or on its storage size - those concerns are addressed by separate mechanisms like access controls, compression, or replication policies. The relationship between consistency and usability is direct: an inconsistent replica may return stale or corrupted data, making it worse than useless in a production context.

Memory tip: Think of a replica like a photocopy - if the copy doesn't match the original, you can't trust it or use it. Consistency = usability.

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