Which of the following is required for traffic symmetry in Azure using NVA?

In the context of Azure and the necessity for traffic symmetry when using a Network Virtual Appliance (NVA), the correct answer is related to SNAT (Source Network Address Translation). Traffic symmetry is important because it ensures that return traffic takes the same path back to the source that the original traffic took. When using an NVA to manage traffic flows, SNAT plays a crucial role in accomplishing this.

When traffic leaves a private or virtual network and is routed through an NVA, the NVA typically replaces the source IP address of the outbound traffic with its own public IP address (this process is known as SNAT). As a result, the return traffic from the destination back to the source must return to the NVA first, in order to get back to the original sender in a symmetric manner. This allows the NVA to properly manage the flow and state of the connections, ensuring that the sessions remain intact.

In the context of the other options, while each plays a role in network architecture and management in Azure, they do not directly contribute to achieving traffic symmetry like SNAT does. For instance, Direct Routing typically deals with routing decisions without altering the IP address, while a VPN Gateway focuses on secure connections rather than symmetric flows. Load Balancers help