AWS (Amazon Web Services) Certification Practice Exam

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What is the function of a Root Table in a VPC?

To add security groups to instances
To allow specific machines to communicate within the VPC
To allocate storage for VPC resources
To manage VPC traffic encryption

The correct answer is: To allow specific machines to communicate within the VPC

The root table in a Virtual Private Cloud (VPC) primarily functions as the main routing table that dictates how traffic is directed within the VPC and to outside networks. Its primary role is to define the routing rules that guide how communication occurs between different subnets and instances. Specifically, the root table allows specific machines and resources within the VPC to communicate with each other efficiently. This is crucial for ensuring that data can flow between various components of a cloud infrastructure, such as instances and services, on the same network without unnecessary complexity. In the context of the other choices, they incorrectly relate to other VPC features. Adding security groups is about managing network access based on rules and permissions, not about routing traffic. Allocating storage for VPC resources is more aligned with services like Amazon S3 or EBS, rather than routing. Lastly, traffic encryption is handled through different mechanisms, such as using VPN or specific encryption protocols, rather than through a routing table. Thus, the root table specifically plays a vital role in traffic direction and communication between machines within the VPC.