Database connections and proxies
Database engines with appropriate use cases (for example, heterogeneous migrations, homogeneous migrations)
Database replication (for example, read replicas)
Database types and services (for example, relational compared with nonrelational, Aurora, DynamoDB)
AWS cost management service features (for example, cost allocation tags, multi-account billing)
AWS cost management tools with appropriate use cases (for example, Cost Explorer, AWS Budgets, AWS Cost and Usage Report)
Load balancing concepts (for example, Application Load Balancer)
NAT gateways (for example, NAT instance costs compared with NAT gateway costs)
Network connectivity (for example, private lines, dedicated lines, VPNs)
Network routing, topology, and peering (for example, AWS Transit Gateway, VPC peering)
Network services with appropriate use cases (for example, DNS)