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Difficulty: MediumHigh-Performing and Elastic Compute Solutions

A weather research institute is deploying a distributed numerical weather prediction model on Amazon EC2. The application consists of tightly-coupled compute nodes that require sub-millisecond node-to-node network latency and maximum throughput to exchange state data. Additionally, a Solutions Architect must configure an Application Load Balancer (ALB) to route incoming analysis requests to the compute nodes, which listen on custom port 8080. Which combination of actions should the Solutions Architect take to meet these requirements? (Select TWO.)

  1. Deploy the EC2 instances in a cluster placement group.Answer
  2. Configure the Application Load Balancer target group health check to query port 8080.Answer
  3. C
    Deploy the EC2 instances in a spread placement group.
  4. D
    Deploy the EC2 instances in a partition placement group.
  5. E
    Configure the Application Load Balancer target group health check to query the default port 80.

Answer

Deploying the EC2 instances in a cluster placement group and configuring the Application Load Balancer target group health check to query port 8080.
Deploying the EC2 instances in a cluster placement group places the instances close together within a single Availability Zone, which satisfies the requirement for sub-millisecond node-to-node latency and maximum network throughput. Additionally, because the application is listening on a custom port 8080, the target group health check must be explicitly configured to query port 8080 to ensure the load balancer can correctly monitor the application's status.

Step-by-Step Solution

1
Analyze the networking requirements of the distributed weather forecasting simulation nodes.
The nodes are tightly coupled and require sub-millisecond node-to-node latency and high network throughput.
This requirement determines the type of EC2 placement group needed.
2
Select the correct EC2 placement group style.
A cluster placement group is selected because it packs instances close together inside a single Availability Zone, achieving the lowest possible latency and highest network performance.
Spread and partition placement groups do not guarantee low-latency node-to-node communication.
3
Configure the Application Load Balancer target group settings for the simulation service.
The target group's health check is explicitly configured to query port 8080, matching the custom port on which the simulation service runs.
If the health check defaults to another port like 80, the load balancer will fail to reach the service, marking the healthy instances as unhealthy.

Key Concept

High-Performance Compute placement groups and target group health check port synchronization.
Estimated Time:2m 0s
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Topics

High-Performing and Elastic Compute Solutions

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