ACloud Guru Certified Cloud Practitioner Practice Exam

Which AWS service helps ensure fault tolerance by distributing traffic across multiple Availability Zones?

1. VPC Peering

2. Route 53

3. Elastic Load Balancer

4. Amazon S3

The correct answer is: Elastic Load Balancer

The service that helps ensure fault tolerance by distributing traffic across multiple Availability Zones is Elastic Load Balancer. This service automatically distributes incoming application traffic across several targets, such as EC2 instances, in different Availability Zones. By balancing the load, it not only helps to optimize resource usage but also increases the availability of applications, ensuring that if one Availability Zone becomes unavailable, the traffic is rerouted to healthy instances in other zones. This redundancy and traffic distribution strategy enhances the overall resilience and fault tolerance of applications deployed in AWS. In contrast, other options do not primarily focus on this function. VPC Peering allows for networking connectivity between VPCs but does not handle traffic distribution for fault tolerance. Route 53 is a domain name system (DNS) web service that provides routing and can direct traffic to multiple endpoints, but its core function isn't to balance loads across Availability Zones like Elastic Load Balancer. Amazon S3 is a storage service that provides high durability and availability for data but does not perform traffic distribution for applications.