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Why does AWS recommend avoiding CIDR blocks with mask sizes smaller than /16 for VPCs?

hard📝 Conceptual Q10 of 15
AWS - VPC Fundamentals
Why does AWS recommend avoiding CIDR blocks with mask sizes smaller than /16 for VPCs?
ABecause smaller CIDR blocks have fewer IP addresses
BBecause larger CIDR blocks increase routing complexity and resource limits
CBecause AWS does not support CIDR blocks smaller than /16
DBecause smaller CIDR blocks cause security issues
Step-by-Step Solution
Solution:

  1. Step 1: Understand CIDR block size impact

    Smaller mask means larger network with more IPs, increasing routing table size and complexity.

  2. Step 2: AWS best practice reasoning

    AWS limits and performance recommend avoiding very large CIDR blocks (smaller than /16) to reduce complexity and resource strain.

  3. Final Answer:

    Larger CIDR blocks increase routing complexity and resource limits -> Option B

  4. Quick Check:

    Large CIDR blocks = more routing complexity [OK]
Quick Trick: Avoid very large CIDR blocks to reduce routing load [OK]
Common Mistakes:
MISTAKES
  • Thinking smaller mask means fewer IPs
  • Assuming AWS disallows smaller than /16
  • Confusing security with CIDR size

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