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20 votes

The decision was made to place database hosts in their own VPC, and to set up VPC peering to different VPCs containing the application and web tiers. The application servers are unable to connect to the database.Which network troubleshooting steps should be taken to resolve the issue?
    Check to see if the application servers are in a private subnet or public subnet. 5.0% (1 vote)
    Check the route tables for the application server subnets for routes to the VPC peering connection. 90.0% (18 votes)
    Check the network access control lists for the database subnets for rules that allow traffic from the Internet. 5.0% (1 vote)
    Check to see if the database VPC has an Internet gateway 0.0% (0 votes)
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