AWS Certified Cloud Practitioner — Question 955

A company has a single Amazon EC2 instance. The company wants to adopt a highly available architecture.
What can the company do to meet this requirement?

Answer options

• A. Scale vertically to a larger EC2 instance size.
• B. Scale horizontally across multiple Availability Zones.
• C. Purchase an EC2 Dedicated Instance.
• D. Change the EC2 instance family to a compute optimized instance.

Correct answer: B

Explanation

To achieve high availability, a system must be designed to withstand the failure of an individual component or data center, which is accomplished by scaling horizontally across multiple Availability Zones. Vertical scaling (A) and changing instance families (D) only alter the capacity of a single instance, leaving it as a single point of failure. Purchasing an EC2 Dedicated Instance (C) provides dedicated physical hardware but does not inherently address high availability.