You have three VPCs: VPC A, VPC B, and VPC C. VPC A is peered with VPC B, and VPC B is peered with VPC C. Can instances in VPC A communicate with instances in VPC C through VPC B?

hard📝 Application Q8 of 15

AWS - VPC Fundamentals

ANo, because VPC peering does not support transitive routing

BYes, if route tables in VPC B allow forwarding

CYes, if security groups allow traffic

DNo, because peering connections must be in the same region

Step-by-Step Solution

Solution:

Step 1: Understand transitive routing limitation
VPC peering connections do not allow traffic to transit through a third VPC.
Step 2: Analyze the scenario
Even if VPC A is peered with B and B with C, A cannot reach C through B.
Final Answer:
No, because VPC peering does not support transitive routing -> Option A
Quick Check:
Transitive routing = Not allowed in VPC peering [OK]

Quick Trick: Peering is one-to-one, no transit through third VPC [OK]

Common Mistakes:

MISTAKES

Assuming route tables enable transit
Ignoring transitive routing limitation
Confusing region restrictions with transit

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You have three VPCs: VPC A, VPC B, and VPC C. VPC A is peered with VPC B, and VPC B is peered with VPC C. Can instances in VPC A communicate with instances in VPC C through VPC B?

Step 1: Understand transitive routing limitation

Step 2: Analyze the scenario

Final Answer:

Quick Check:

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