Amazon Web Services SOA-C01 Practice Exam Dumps 2025

A company needs to deploy a web application on two Amazon EC2 instances behind an Application Load Balancer (ALB). Two EC2 instances will also be deployed to host the database. The infrastructure needs to be designed across Availability Zones for high availability and must limit public access to the instances as much as possible.

How should this be achieved within a VPC?

Options:

Create one public subnet for the Application Load Balancer, one public subnet for the servers, and private subnet for the database servers.

Create one public subnets for the Application Load Balancer, two private subnets for the web servers, and two private subnets for the database servers.

Create two public subnets for the Application Load Balancer, two public subnets for the web servers, and two public subnets for the database servers.

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Question 2

An application running on Amazon EC2 allows users to launch batch jobs for data analysis. The jobs are run asynchronously, and the user is notified when they are complete. While multiple jobs can run concurrently, a user’s request need not be fulfilled for up to 24 hours. To run a job, the application launches an additional EC2 instance that performs all the analytics calculations. A job takes between 75 and 110 minutes to complete and cannot be interrupted.

What is the MOST cost-effective way to run this workload?

Options:

Run the application on On-Demand EC2 instances. Run the jobs on Spot Instances with a specified duration.

Run the application on Reserved Instance EC2 instances. Run the jobs on AWS Lambda.

Run the application on On-Demand EC2 instances. Run the jobs on On-Demand EC2 instances.

Run the application on Reserved instance EC2 instances. Run the jobs on Spot Instances with a specified duration.

Question 3

A SysOps Administrator is maintaining an application that runs on Amazon EC2 instances behind an application Load Balancer (ALB). Users are reporting errors when attempting to launch the application. The administrator notices an increase in the httpcode_ELS_5xx_Count Amazon CloudWatch metric for the load balancer.

What is the possible cause for this increase?

Options:

The ALB Is associated with private subnets within the VPC.

The ALB received a request from a client, but the client closed the connection.

The ALB security group is not configured to allow inbound traffic from the users.

The ALB target group does not contain healthy EC2 instances.

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