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Routing tables play a crucial role in managing network traffic within an Amazon Virtual Private Cloud (VPC). They determine how network traffic is directed between subnets, VPCs, and on-premises networks.

A routing table is a set of rules, known as routes, that specify where network traffic should be directed. Each subnet within a VPC is associated with a routing table, and by default, the main route table is assigned to all subnets.

To configure routing tables and propagate routes between VPCs and on-premises networks, follow these steps:

1. Create custom route tables: By default, each VPC comes with a main route table. However, you can create custom route tables to define specific routing rules for different subnets or VPCs.

2. Associate subnets with route tables: Associate each subnet with a specific route table that contains the desired routing rules for that subnet.

3. Propagate routes between VPCs: To allow traffic to flow between VPCs, you can configure route propagation. Route propagation enables routes from one VPC to be propagated to another VPC.

4. Configure route priorities: When multiple routes match a destination, the route with the lowest numerical prefix length takes precedence. You can adjust the priorities of routes by modifying their prefix lengths.

5. Test network connectivity: After configuring routing tables and route propagation, verify network connectivity between subnets, VPCs, and on-premises networks to ensure traffic is routed correctly.

Routing tables can be customized to meet specific network requirements, allowing for flexible and efficient routing within an AWS environment. Proper configuration and management of routing tables are essential for maintaining a secure and reliable network infrastructure.

In your own words, routing tables in AWS are responsible for ____ network traffic between subnets, VPCs, and on-premises networks.