Table of Contents
Question
An ecommerce company wants to design a highly available application that will be hosted on multiple Amazon EC2 instances.
How should the company deploy the EC2 instances to meet these requirements?
A. Across multiple edge locations
B. Across multiple VPCs
C. Across multiple Availability Zones
D. Across multiple AWS accounts
Answer
C. Across multiple Availability Zones
Explanation
The correct answer is C. Across multiple Availability Zones.
Availability Zones are distinct locations within an AWS Region. They are isolated from each other by different physical infrastructure, such as power grids, cooling systems, and networking. This means that if there is an outage in one Availability Zone, the application will still be available in the other Availability Zones.
Deploying EC2 instances across multiple Availability Zones is a best practice for achieving high availability. This is because it reduces the risk of the application being unavailable due to a regional outage.
The other answer choices are not as effective in achieving high availability.
- Option A: Deploying EC2 instances across multiple edge locations does not provide as much protection against regional outages, as edge locations are still within the same Region.
- Option B: Deploying EC2 instances across multiple VPCs does not provide as much protection against regional outages, as VPCs are still within the same Region.
- Option D: Deploying EC2 instances across multiple AWS accounts does not provide any additional protection against regional outages, as both accounts are still in the same Region.
Therefore, the correct answer is C. Across multiple Availability Zones.
Here are some additional considerations for deploying EC2 instances for high availability:
- Use an Auto Scaling group to automatically scale the number of EC2 instances based on demand. This will help to ensure that the application is always available, even during periods of high traffic.
- Use a load balancer to distribute traffic across the EC2 instances. This will help to improve performance and prevent any single instance from becoming overloaded.
- Use a DNS failover service to ensure that the application is always accessible, even if one of the DNS servers fails.
By following these best practices, you can help to ensure that your application is highly available and resilient to outages.
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