AWS Certified Solutions Architect High Availability and Scalability 2

Question 1

An application uses an Application Load Balancer with EC2 instances in two Availability Zones. After a recent deployment, one AZ becomes unhealthy. What does the ALB do automatically?

Accepted Answer

Routes all traffic to the healthy AZ while the unhealthy AZ recovers

Answer

Terminates all instances in the unhealthy AZ

Answer

Stops accepting new connections entirely

Answer

Sends an SNS notification and waits for manual intervention

Question 2

A company wants to scale EC2 instances based on the number of messages in an SQS queue. Which Auto Scaling policy type is most appropriate?

Accepted Answer

Target tracking scaling policy using a custom CloudWatch metric

Answer

Simple scaling policy

Answer

Step scaling policy

Answer

Scheduled scaling policy

Question 3

Which RDS feature automatically promotes a standby replica to primary when the primary instance fails, minimizing downtime?

Accepted Answer

Multi-AZ failover

Answer

Read Replica promotion

Answer

RDS Proxy connection pooling

Answer

Aurora Global Database failover

Question 4

A web application needs to handle sudden traffic spikes that last only a few minutes. Which EC2 Auto Scaling feature best handles this without over-provisioning?

Accepted Answer

Warm pools

Answer

Predictive scaling

Answer

Scheduled scaling

Answer

Dynamic scaling with step scaling policies

Question 5

An Elastic Load Balancer must distribute traffic to EC2 instances across three AZs, but one AZ has significantly fewer instances. Which feature ensures even distribution?

Accepted Answer

Cross-zone load balancing

Answer

Sticky sessions

Answer

Connection draining

Answer

Path-based routing

Question 6

A company uses Aurora MySQL and wants zero-downtime read scaling. They already have 3 read replicas. What is the maximum number of Aurora read replicas supported per cluster?

Accepted Answer

15

Answer

5

Answer

10

Answer

25

Question 7

Which Route 53 routing policy distributes traffic based on the geographic location of the DNS query origin, helping reduce latency for global users?

Accepted Answer

Latency-based routing

Answer

Weighted routing

Answer

Geolocation routing

Answer

Failover routing