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You created a VPC peering connection but forgot to update the route tables. What will be the result?

medium📝 Debug Q6 of 15
AWS - VPC Fundamentals
You created a VPC peering connection but forgot to update the route tables. What will be the result?
APeering connection will be deleted automatically
BTraffic will flow without routes due to default routing
CInstances in peered VPCs cannot communicate
DSecurity groups will block all traffic
Step-by-Step Solution
Solution:

  1. Step 1: Understand route table role

    Route tables direct traffic between networks; without routes, traffic cannot reach peered VPC.

  2. Step 2: Check peering connection behavior

    Peering stays active but no communication happens without routes.

  3. Final Answer:

    Instances in peered VPCs cannot communicate -> Option C

  4. Quick Check:

    Missing routes = no communication [OK]
Quick Trick: Always update route tables after peering setup [OK]
Common Mistakes:
  • Expecting automatic routing updates
  • Assuming peering deletes itself if unused
  • Confusing security groups with routing

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