AWS Certified Solutions Architect - Associate
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A company wants to run an in-memory database for a latency-sensitive application that runs on Amazon EC2 instances. The application processes more than 100,000 transactions each minute and requires high network throughput. A solutions architect needs to provide a cost-effective network design that minimizes data transfer charges.
Which solution meets these requirements?
Other
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UAnonymous
A
Launch all EC2 instances in the same Availability Zone within the same AWS Region. Specify a placement group with cluster strategy when launching EC2 instances.
B
Launch all EC2 instances in different Availability Zones within the same AWS Region. Specify a placement group with partition strategy when launching EC2 instances.
C
Deploy an Auto Scaling group to launch EC2 instances in different Availability Zones based on a network utilization target.
D
Deploy an Auto Scaling group with a step scaling policy to launch EC2 instances in different Availability Zones.
Explanation:
Explanation
Correct Answer: A
Why Option A is correct:
- Minimizes data transfer charges: When EC2 instances are in the same Availability Zone, there are no data transfer charges between them. Data transfer between instances in different Availability Zones incurs charges.
- Placement group with cluster strategy: This provides low-latency, high-throughput network performance by placing instances close together within a single Availability Zone, which is ideal for latency-sensitive applications like in-memory databases.
- High network throughput: Cluster placement groups provide high-bandwidth, low-latency networking between instances.
- Cost-effective: Eliminates cross-AZ data transfer costs while providing optimal performance for the in-memory database.
Why other options are incorrect:
- Option B: Launching instances in different Availability Zones would incur data transfer charges between zones, which contradicts the requirement to minimize data transfer charges.
- Option C: Auto Scaling across different Availability Zones would also incur data transfer charges and doesn't provide the low-latency, high-throughput networking needed for an in-memory database.
- Option D: Similar to option C, this would spread instances across Availability Zones, incurring data transfer charges and not providing optimal network performance for latency-sensitive applications.
Key AWS Concepts:
- Placement Groups: Cluster placement groups pack instances close together inside an Availability Zone to achieve low-latency, high-throughput networking.
- Data Transfer Pricing: Data transfer between Availability Zones is charged, while data transfer within the same Availability Zone is free.
- In-memory databases: Require low latency and high throughput between nodes, making cluster placement groups ideal.
- Network Performance: Cluster placement groups can provide up to 10 Gbps per flow and up to 100 Gbps aggregate bandwidth for supported instance types.
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