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If an S3 bucket has default encryption set to SSE-S3, what happens when you upload an object with no encryption headers?

medium📝 Predict Output Q5 of 15
AWS - S3 Fundamentals
If an S3 bucket has default encryption set to SSE-S3, what happens when you upload an object with no encryption headers?
AThe object is stored unencrypted
BThe object is encrypted using SSE-KMS
CThe object is encrypted using SSE-S3 automatically
DThe upload fails with an error
Step-by-Step Solution
Solution:

  1. Step 1: Understand default encryption behavior

    When default encryption is enabled on a bucket, objects uploaded without encryption headers are encrypted automatically.

  2. Step 2: Identify encryption type

    Since default encryption is SSE-S3, the object is encrypted with SSE-S3.

  3. Final Answer:

    Object encrypted automatically with SSE-S3 -> Option C

  4. Quick Check:

    Default encryption = automatic SSE-S3 [OK]
Quick Trick: Default encryption applies when no headers present [OK]
Common Mistakes:
  • Thinking upload fails without encryption header
  • Assuming object is unencrypted by default
  • Confusing SSE-KMS with SSE-S3 default

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