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What is the default effect of an AWS IAM policy statement if the Effect field is omitted?

easy📝 Conceptual Q1 of 15
AWS - Identity and Access Management
What is the default effect of an AWS IAM policy statement if the Effect field is omitted?
ANo effect
BAllow
CDeny
DDepends on the service
Step-by-Step Solution
Solution:

  1. Step 1: Understand IAM policy default behavior

    In AWS IAM, if the Effect field is omitted, the policy statement is invalid and does not grant any permissions.

  2. Step 2: Effect field role in policy

    Since the statement is invalid, it has no effect; AWS treats it as if it doesn't exist, resulting in no permissions granted.

  3. Final Answer:

    Missing Effect means the statement has no effect -> Option A

  4. Quick Check:

    Missing Effect = No effect [OK]
Quick Trick: Missing Effect means no effect; policy statement is invalid [OK]
Common Mistakes:
MISTAKES
  • Assuming missing Effect means Allow
  • Thinking effect depends on service
  • Believing no Effect means deny

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