ACloud Guru Certified Cloud Practitioner Practice Exam

To ensure high availability when configuring an Application Load Balancer, which action is necessary?

1. Set up multiple Edge Locations

2. Configure to serve traffic to multiple Availability Zones

3. Set up more than one ALB

4. Set up cross-region Load Balancing

The correct answer is: Configure to serve traffic to multiple Availability Zones

Configuring an Application Load Balancer (ALB) to serve traffic across multiple Availability Zones is essential for ensuring high availability. This is because Availability Zones are designed to be isolated from each other, providing redundancy and fault tolerance within a region. By distributing the load across multiple zones, you minimize the risk that an issue in one zone could affect the overall application availability. If one Availability Zone experiences an outage or significant degradation in performance, the load balancer can reroute traffic to the healthy instances running in other Availability Zones. This setup not only enhances the resilience of the application but also optimizes resource utilization, leading to better performance overall. Using multiple Edge Locations primarily relates to content delivery networks (CDNs) and does not inherently provide high availability for applications hosted on an ALB, as edge locations serve to cache and expedite content delivery rather than manage traffic to backend services. While setting up more than one ALB might seem beneficial, it does not directly contribute to availability for a single application; rather, it can lead to more complexity and potential configuration issues. Cross-region Load Balancing offers benefits for load distribution and disaster recovery across different geographical regions, but for ensuring high availability within a given area, focusing on multiple Availability Zones within the same region is