AWS - VPC Fundamentals
If two VPCs have overlapping CIDR blocks, what is the expected behavior when trying to route traffic between them using VPC peering?
If two VPCs have overlapping CIDR blocks, what is the expected behavior when trying to route traffic between them using VPC peering?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand VPC peering requirements
VPC peering requires non-overlapping CIDR blocks to route traffic correctly.Step 2: Analyze overlapping CIDR impact
If CIDR blocks overlap, routing tables cannot distinguish IPs, causing routing failure.Final Answer:
Traffic routing fails due to overlapping IP ranges -> Option BQuick Check:
Overlapping CIDRs block peering traffic [OK]
Quick Trick: No overlapping CIDRs in VPC peering [OK]
Common Mistakes:
MISTAKES- Assuming AWS fixes overlapping CIDRs automatically
- Thinking traffic routes via internet gateway in peering
- Believing overlapping CIDRs cause no issues
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