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Amazon CLF-C02: How can company increase resilience for application?

By: Author Alex Lim

Posted on  - Last updated:

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Question

A company is launching a critical business application in an AWS Region.

How can the company increase resilience for this application?

A. Deploy a copy of the application in another AWS account.
B. Deploy the application by using multiple VPCs.
C. Deploy the application by using multiple subnets.
D. Deploy the application by using multiple Availability Zones.

Answer

D. Deploy the application by using multiple Availability Zones.

Explanation

The correct answer to the question is D. Deploy the application by using multiple Availability Zones.

An Availability Zone (AZ) is a distinct location within an AWS Region that is isolated from the other AZs in that Region. Each AZ has independent power, cooling, and physical security, and is connected to the other AZs in the same Region by low-latency, high-throughput, and highly redundant networking.

By deploying the application by using multiple AZs, the company can increase resilience for this application by ensuring that it can withstand failures of individual servers, network devices, or even an entire AZ. This way, the application can continue to operate even if one AZ becomes unavailable or degraded.

Some of the benefits of deploying applications across multiple AZs are:

  • Improved fault tolerance: If one AZ fails, the application can still run on the other AZs without interruption.
  • Enhanced performance: The application can leverage the low-latency network connections between AZs to distribute load and reduce latency for end users.
  • Increased scalability: The application can scale up or down based on demand by adding or removing resources in different AZs.

Some of the AWS services that support deploying applications across multiple AZs are:

  • Amazon Elastic Compute Cloud (EC2): You can launch EC2 instances in different AZs and use Elastic Load Balancing (ELB) or Amazon Route 53 to distribute traffic across them.
  • Amazon Relational Database Service (RDS): You can create RDS instances with Multi-AZ deployments, which automatically provision and maintain a synchronous standby replica in a different AZ for high availability and data durability.
  • Amazon Simple Storage Service (S3): You can store your data in S3 buckets that are replicated across multiple AZs within a Region by default.
  • Amazon Elastic File System (EFS): You can create EFS file systems that are accessible from EC2 instances in multiple AZs within a Region.

How can company increase resilience for application?

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