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You try to launch an EC2 instance in the Default VPC but get a network error. What is the most likely cause?

medium📝 Debug Q14 of 15
AWS - VPC Fundamentals
You try to launch an EC2 instance in the Default VPC but get a network error. What is the most likely cause?
AThe Default VPC was deleted or modified incorrectly
BYou forgot to create a subnet manually
CThe instance type is not supported in the Default VPC
DAWS does not allow EC2 in Default VPC
Step-by-Step Solution
Solution:

  1. Step 1: Recall Default VPC properties

    Default VPC exists by default with subnets and internet gateway.

  2. Step 2: Analyze network error cause

    If network errors occur, it often means the Default VPC was deleted or changed wrongly.

  3. Final Answer:

    The Default VPC was deleted or modified incorrectly -> Option A

  4. Quick Check:

    Network error = Default VPC missing/changed [OK]
Quick Trick: Network errors often mean Default VPC missing or changed [OK]
Common Mistakes:
MISTAKES
  • Assuming subnets must be created manually
  • Thinking instance type blocks launch
  • Believing EC2 is disallowed in Default VPC

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