After an acquisition, a company manages two AWS Organizations. In one organization it runs multiple service-provider applications exposed as AWS PrivateLink-powered VPC endpoint services; in the other it runs multiple service-consumer applications. The solutions architect finds data transfer charges are much higher than expected. Which developer deployment guidelines will reduce data transfer charges across the environment? (Choose two.)
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Correct answer: Disable cross-zone load balancing for the Network Load Balancer in all service-provider application deployments., Ensure service-consumer compute resources use the Availability Zone–specific endpoint service by using the endpoint's local DNS name..
Why this is the answer
Data transfer charges between Availability Zones (AZs) are a common cost driver. Disabling cross-zone load balancing on Network Load Balancers (NLBs) prevents traffic from being routed to targets in other AZs, thus avoiding inter-AZ data transfer costs for those connections. Similarly, ensuring service consumers use the AZ-specific endpoint service via its local DNS name directs traffic to endpoints within the same AZ, eliminating cross-AZ data transfer for PrivateLink connections. Deploying applications into the same organization or sharing subnets via RAM doesn't inherently reduce inter-AZ data transfer. Purchasing a Savings Plan reduces the cost of existing usage, but doesn't reduce the volume of data transfer.
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