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AWS Certified Solutions Architect study material · question 381 of 500

A default VPC exists in the Region and an instance is launched without naming a subnet. What happens?

  1. The launch fails until a subnet is specified
  2. A new subnet is created for the instance
  3. The instance launches with no network interface
  4. AWS picks one of the default subnets and launches it there
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Answer: D. AWS picks one of the default subnets and launches it there

With a default VPC present, omitting the subnet lets AWS choose one of its default subnets for the instance.

Source: How Amazon VPC works (Amazon Web Services) — Default and nondefault VPCs

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