The VPC staging has four subnets: web-a, web-b, data-a and data-b. All of them use the main route table.

1. Keep the VPC's id in VPC:

   sh

   copy

   VPC=$(aws ec2 describe-vpcs --filters Name=tag:Name,Values=staging --query "Vpcs[0].VpcId" --output text)

2. Create a route table named web, keeping its id in RT, and associate it with both web subnets. Each association needs that subnet's id in SUBNET first.

3. Create a route table named data and associate it with both data subnets.

4. Read the routes of web.