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AWS Certified Advanced Networking - Specialty · AWS
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only C is correct!
C - The tunnel needs Asymmetric Routing Static VPNs created between a customer gateway and either a virtual private gateway or a transit gateway In this scenario, the virtual private gateway or transit gateway sends traffic from AWS to the on-premises network on a single VPN tunnel. This tunnel is randomly chosen by AWS and is referred to as the preferred tunnel. If the AWS VPN connection (static routing type) has an Active/Active configuration (both tunnels are UP), then you can't configure AWS to prefer a specific tunnel to send traffic. For example, tunnel A was randomly chosen by AWS as the preferred VPN tunnel for sending traffic from AWS to the on-premises network. If tunnel A goes down, then traffic from AWS automatically fails over to tunnel B. Note: With an Active/Active configuration, the customer gateway must have Asymmetric routing activated on the virtual tunnel interfaces.
In an Active/Active configuration with ECMP routing, where both tunnels are utilized simultaneously, enabling asymmetric routing on the virtual tunnel interfaces of the customer gateway is indeed necessary to accommodate the bidirectional flow of traffic over the two tunnels.