4.4 Design cost-optimized network architectures.
Objective 4.4 sits in Design Cost-Optimized Architectures, which carries 20% of the Solutions Architect Associate exam. The questions below are original, written from the official objective title above, and each explanation cites the Amazon Web Services (AWS) page it rests on.
Objective title verbatim from the official objectives. Amazon Web Services (AWS) exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
Instances in private subnets pull terabytes from S3 every month through a NAT gateway, and the data processing charge dominates the network bill. What removes it?
Correct.
Concept
Traffic to an AWS service that never needed to leave the network is being charged as though it did. Routing it through an endpoint inside the VPC takes the metered device out of the path entirely rather than making that device cheaper.
Why A
A gateway endpoint gives private subnets connectivity to S3 without an internet gateway or a NAT device, and AWS charges nothing additional for using one. The terabytes stop crossing the NAT gateway, so its per-gigabyte processing charge disappears.
Source
Now you: objective 4.4 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
To save money a team runs one NAT gateway and routes private subnets in all three Availability Zones through it. What does that choice cost them?
Sample question 2 of 3
Two VPCs owned by different accounts sit in the same Availability Zone and exchange large volumes over a peering connection. Finance asks what that traffic costs.
Sample question 3 of 3
Two Regions replicate data between VPCs over public endpoints today. The team wants private addressing, encryption in transit and a lower bill. What do they build?
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Read the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.