AWS Certified Advanced Networking Specialty Practice Exam

In a scenario with multiple instances accessing a centralized service, which element must be correctly configured for access?

1. Route entries in associated subnet route tables

2. Control plane policies in AWS

3. Complex IAM role structures

4. Virtual Network computing configurations

The correct answer is: Route entries in associated subnet route tables

In a scenario where multiple instances are accessing a centralized service, the routing of traffic is critical to ensure proper connectivity. Route entries in associated subnet route tables define the paths that network traffic takes within a Virtual Private Cloud (VPC) or across VPCs. These entries must be correctly configured to point to the appropriate destinations so that instances in different subnets can communicate with the centralized service effectively. When the route table includes correct entries, it provides a means for the instances to reach the centralized service by specifying the correct next hop, whether that’s through an Internet Gateway, a NAT Gateway, or peering connections in a VPC. This is particularly important when instances are in different subnets or VPCs, where proper routing tables will facilitate the necessary communications. Without properly configured route entries, network traffic could be misrouted or blocked entirely, leading to connectivity issues that would prevent instances from accessing the centralized service. Thus, ensuring that route entries in associated subnet route tables are accurately set up is fundamental for enabling communication in this scenario.