A company wants to design a fault-tolerant EC2 architecture that can withstand the failure of an entire Availability Zone. Which approach should be used?

Use a single large EC2 instance with enhanced networking

Distribute EC2 instances across multiple Availability Zones and use an Auto Scaling group

Use EC2 instances in a single placement group

Place all EC2 instances in a single Availability Zone and use Elastic IP addresses

A company runs a stateless web application on EC2 instances in a single Auto Scaling group. The application must remain available if an entire Availability Zone becomes unavailable. Which configuration should be used?

Use a larger instance type for all instances.

Place all instances in a single placement group.

Configure the Auto Scaling group to use multiple Availability Zones.

Increase the desired capacity of the Auto Scaling group.

An Application Load Balancer marks a target as unhealthy. The target's application logs show that the health check requests are returning HTTP 503 responses. What is the most likely cause of the health check failure?

The application is overloaded or unavailable and cannot respond successfully

The target is not registered with the load balancer

The target's security group is blocking the health check traffic

The health check path is incorrect and returns a 404 error

AWSCertified CloudOps Engineer - Associate

Domain 2Objective 2

Task 2.2: Implement Highly Available and Resilient Environments. SOA-C03 Practice Questions (Page 2)

Part of the Content Domain 2: Reliability and Business Continuity domain, which makes up ~25% of our current practice bank. AWS does not publish an official question count, but from its 130-minute exam (~50–85 total, ~13–21 in this domain), expect 4–7 from this objective — we provide 19 practice questions to prepare you well beyond it. (estimate)

19questions here

4free pages

7concepts

Questions 6–10

6foundation · easy
A company runs a web application with two EC2 instances behind an Application Load Balancer. Both instances are active and serving traffic. What fault-tolerant pattern does this represent?
Select an answer first
7foundation · easy
A company wants to design a fault-tolerant EC2 architecture that can withstand the failure of an entire Availability Zone. Which approach should be used?
Select an answer first
8application · medium
A company runs a stateless web application on EC2 instances in a single Auto Scaling group. The application must remain available if an entire Availability Zone becomes unavailable. Which configuration should be used?
Select an answer first
9foundation · easy
A company has a primary database in one AWS Region and a standby database in another Region. The standby is not serving traffic unless the primary fails. What fault-tolerant pattern does this represent?
Select an answer first
10foundation · easy
An Application Load Balancer marks a target as unhealthy. The target's application logs show that the health check requests are returning HTTP 503 responses. What is the most likely cause of the health check failure?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to SOA-C03

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by AWS. “SOA-C03” is a trademark of its owner, used for identification only.

Task 2.2: Implement Highly Available and Resilient Environments. SOA-C03 Practice Questions (Page 2)

Questions 6–10

A company runs a web application with two EC2 instances behind an Application Load Balancer. Both instances are active and serving traffic. What fault-tolerant pattern does this represent?

A company wants to design a fault-tolerant EC2 architecture that can withstand the failure of an entire Availability Zone. Which approach should be used?

A company runs a stateless web application on EC2 instances in a single Auto Scaling group. The application must remain available if an entire Availability Zone becomes unavailable. Which configuration should be used?

A company has a primary database in one AWS Region and a standby database in another Region. The standby is not serving traffic unless the primary fails. What fault-tolerant pattern does this represent?

An Application Load Balancer marks a target as unhealthy. The target's application logs show that the health check requests are returning HTTP 503 responses. What is the most likely cause of the health check failure?

Keep studying — Content Domain 2: Reliability and Business Continuity