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A developer attaches a Lambda layer but the function fails with a permission error. What is the most likely cause?

medium📝 Debug Q6 of 15
AWS - Lambda
A developer attaches a Lambda layer but the function fails with a permission error. What is the most likely cause?
AThe layer size exceeds the limit
BThe function's execution role lacks permission to access the layer
CThe function timeout is too short
DThe layer code has syntax errors
Step-by-Step Solution
Solution:

  1. Step 1: Analyze permission error cause

    Permission errors usually mean the function cannot access the layer resource.

  2. Step 2: Check execution role permissions

    The function's role must have permission to use the layer; missing this causes failure.

  3. Final Answer:

    The function's execution role lacks permission to access the layer -> Option B

  4. Quick Check:

    Permission error = missing role access to layer [OK]
Quick Trick: Ensure execution role can access layers to avoid permission errors [OK]
Common Mistakes:
MISTAKES
  • Blaming code syntax for permission errors
  • Ignoring role permissions
  • Assuming timeout or size causes permission issues

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