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Why does AWS require VPC CIDR blocks to be non-overlapping for peering connections?

hard📝 Conceptual Q10 of 15
AWS - VPC Fundamentals
Why does AWS require VPC CIDR blocks to be non-overlapping for peering connections?
ATo enable instances to share the same IP addresses
BTo allow automatic encryption of traffic
CTo prevent IP address conflicts and routing ambiguity
DTo allow internet gateway sharing
Step-by-Step Solution
Solution:

  1. Step 1: Understand routing in peered VPCs

    Non-overlapping CIDRs ensure unique IPs so routing tables can direct traffic correctly.

  2. Step 2: Identify consequences of overlapping CIDRs

    Overlapping IPs cause conflicts and confusion in routing decisions.

  3. Final Answer:

    To prevent IP address conflicts and routing ambiguity -> Option C

  4. Quick Check:

    Non-overlapping CIDRs avoid routing conflicts [OK]
Quick Trick: Unique CIDRs avoid routing conflicts in peering [OK]
Common Mistakes:
MISTAKES
  • Thinking encryption depends on CIDR overlap
  • Believing IP sharing is allowed in peering
  • Assuming internet gateway is shared in peering

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