Task 2.2: Implement Highly Available and Resilient Environments. SOA-C03 Practice Questions (Page 4)

Questions 16–19

1. 16foundation · easy

   An Auto Scaling group is configured to span three Availability Zones. What is the benefit of this configuration?

   • AIt simplifies security group management by using a single security group
   • BIt improves network performance by placing instances in the same AZ
   • CIt ensures that the Auto Scaling group can maintain capacity even if one Availability Zone fails
   • DIt reduces the cost of EC2 instances by using spot instances
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A company runs a web application on EC2 instances in two Availability Zones. An Application Load Balancer distributes traffic. The application must continue to serve traffic even if one instance fails. Which configuration is required to meet this requirement?

   • AEnable cross-zone load balancing on the ALB.
   • BConfigure the ALB to perform health checks and route only to healthy targets.
   • CRegister both instances with the same target group.
   • DUse an Auto Scaling group with a desired capacity of 1.
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   An Application Load Balancer has a target group with two EC2 instances. Both instances are registered and pass the health check, but one instance occasionally returns HTTP 503 errors to clients. The health check is configured with a ping path of /health that returns HTTP 200. What should be done to prevent the ALB from sending traffic to the instance when it is returning 503 errors?

   • AChange the health check path to an endpoint that reflects the application's ability to serve requests.
   • BRemove the instance from the target group.
   • CSet the health check success code to 503.
   • DIncrease the healthy threshold to 5.
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A company runs an Amazon RDS for PostgreSQL database with Multi-AZ enabled. The primary instance in us-east-1a fails. What happens to the database endpoint?

   • AThe endpoint changes to a new DNS name that applications must update.
   • BThe DNS endpoint automatically points to the standby instance in us-east-1b.
   • CA read replica is promoted to primary automatically.
   • DThe database becomes unavailable until a new instance is manually created.
   Reveal Solution Discussion Select an answer first