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You tried to create a subnet with CIDR 10.0.0.0/24 inside a VPC with CIDR 10.0.1.0/16. Why does this fail?

medium📝 Debug Q7 of 15
AWS - VPC Fundamentals
You tried to create a subnet with CIDR 10.0.0.0/24 inside a VPC with CIDR 10.0.1.0/16. Why does this fail?
ASubnet CIDR overlaps with VPC CIDR
BSubnet CIDR cannot be smaller than VPC CIDR
CSubnet CIDR must be within the VPC CIDR range
DSubnet CIDR must be a /16 block
Step-by-Step Solution
Solution:

  1. Step 1: Check VPC and subnet CIDR ranges

    The VPC CIDR is 10.0.1.0/16, which covers 10.0.1.0 to 10.0.255.255.

  2. Step 2: Verify subnet CIDR fit

    Subnet CIDR 10.0.0.0/24 is outside the VPC range, so it fails.

  3. Final Answer:

    Subnet CIDR must be within the VPC CIDR range -> Option C

  4. Quick Check:

    Subnet inside VPC = Required [OK]
Quick Trick: Subnet CIDR must fit inside VPC CIDR block [OK]
Common Mistakes:
  • Assuming subnet can be outside VPC range
  • Confusing smaller and larger CIDR blocks
  • Thinking subnet must be /16 always

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