AWS Certified Solutions Architect Associate SAA-C03 Practice Question
A company's virtual private cloud (VPC) is designed with three isolated subnets, each housed in a separate Availability Zone within the same region. The instances within these subnets require external connectivity to retrieve regular updates. Assuming even distribution and moderate levels of outbound traffic, which setup would be the most economical for providing the necessary access?
Establish a single gateway for network address translation in one Availability Zone and have the other two subnets route their outbound traffic through it.
Implement scaled-down, self-managed translation instances in each subnet rather than using managed gateways.
Eliminate the gateways entirely and assign each isolated subnet an Internet Gateway to ensure external connectivity.
Provision separate gateways for network address translation in each subnet for dedicated outbound access.
Configuring a single gateway for network address translation in one of the Availability Zones is the most economical solution when the traffic is moderate and evenly distributed. This avoids the additional costs that come with setting up a gateway in each Availability Zone. It is important to consider, however, that this can pose a single point of failure and may become a bottleneck if the traffic significantly increases. For architectures where traffic patterns are consistently heavy or high availability is critical, deploying a gateway in each Availability Zone may be justified despite the higher cost.
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