Cloud Formation

Question 1

Cause of “VPCPeeringConnection Failed to Stabilize” error?

Answer 1

1. You created the “AWS:EC2::VPCPeeringConnection” resource in the wrong account (receiving account rather than requesting account)
2. IPv4 CIDR ranges overlap
3. IAM Role in receiving account doesn’t have correct permissions

Question 2

Use case of exporting in Cloud Formation?

Answer 2

To share information between stacks. (Only in same region / account). Example: one stack exports subnet and SG IDs, another stack imports them

Question 3

What are two services that use 128-bit encryption rather than 256?

Answer 3

Cloud Front for field-level encryption; Lambda@Edge