Implement highly available and resilient environments.
13 practice questions under this official exam objective (SOA-C03) — each with the community-verified answer, a full option-by-option explanation and instant feedback.
How Do You Ramp ALB Traffic Gradually During EC2 Cache Warm-Up?
ALB target group slow start mode exists precisely to ramp a newly registered target's traffic share linearly instead of handing it an equal share the
Route 53 Health Checks for Weighted Records
Learn why Route 53 continues routing traffic to unhealthy endpoints when health checks are missing and how to implement them for weighted records to e
How to Fix Forced Logouts Behind CloudFront and an ALB?
Stateful EC2 sessions behind CloudFront and an Application Load Balancer break when CloudFront does not forward cookies and the ALB does not keep each
FSx for Windows File Server Multi-AZ Resiliency
Amazon FSx for Windows File Server provides a fully managed native Windows file share with SMB support and Active Directory integration. Deploying in
Why do EC2 instances return HTTP 500 when status checks are healthy?
When an Auto Scaling group relies only on EC2 status checks, instances that stay reachable but serve HTTP 500 errors from the application are never re
How Do You Add Failover to a Single-AZ RDS for MySQL Instance?
Converting an RDS for MySQL Single-AZ DB instance to a Multi-AZ DB instance deployment gives the application automatic failover to a synchronous stand
How Does Route 53 Enable Automated Failover to a DR Region?
Amazon Route 53 failover routing with a health check on the primary record is the native way to achieve automatic active-passive DNS failover between
How to automatically replicate new S3 objects to us-west-2 with least overhead?
This question tests whether you can choose the native, lowest-overhead mechanism for copying every new object from a us-east-1 S3 bucket to a us-west-
Why Are EC2 Instances in One AZ Not Receiving ALB Traffic?
An Application Load Balancer only routes traffic into Availability Zones whose subnets are attached to it, so healthy instances in an unassociated AZ
How to Balance TCP Port 1028 Across Three EC2 Instances?
This question tests load balancer selection for a custom TCP port (1028) spanning three Availability Zones with the least operational overhead. The an
How to Shift Blue/Green ALB Traffic Gradually with Route 53 DNS?
Using Route 53 weighted alias records that each point at a blue or green ALB lets you dial a percentage of DNS traffic toward green and raise it over
How Should Traffic Route Only to Healthy Application Servers?
This SOA-C03 scenario tests how to keep a three-tier application highly available by monitoring application-server health and routing traffic only to
Scale a Stateless Web App and Make PostgreSQL Highly Available?
This scenario tests decoupling a stateless web tier with an Auto Scaling group and Application Load Balancer while moving PostgreSQL to an Amazon RDS