CLF-C02 Question 156
Single answerAn organization is designing its infrastructure on AWS to ensure high availability and fault tolerance. They have deployed their application across multiple Availability Zones within a single AWS Region. Which of the following best explains why this architecture improves the application's fault tolerance?
- A
Availability Zones are isolated from each other and do not share single points of failure like power, networking, or physical hardware.
- B
Availability Zones are globally distributed data centers, making the application globally redundant.
- C
Availability Zones within a Region share the same physical location but are logically separated for security purposes.
- D
Availability Zones are interconnected by low-latency links, allowing them to share resources in case of failure.
Show answer and explanation
Correct answer: A
Explanation
Availability Zones in an AWS Region are physically separate locations designed to operate independently to ensure high availability. They are isolated from each other to prevent single points of failure, such as power or networking issues, from affecting multiple zones. By deploying resources across multiple AZs, organizations can achieve fault-tolerant architectures that are better equipped to handle failures.
- A. Correct.
Correct: Availability Zones are designed to be isolated from one another, ensuring that a failure in one AZ does not impact others. They do not share single points of failure such as power, networking, or physical hardware.
- B. Incorrect.
Incorrect: Availability Zones are not globally distributed; they are confined to a specific AWS Region. Global redundancy requires deploying resources across multiple AWS Regions, not just AZs.
- C. Incorrect.
Incorrect: Availability Zones are physically separate and not in the same physical location. This physical separation enhances fault tolerance, as they are not just logically separated.
- D. Incorrect.
Incorrect: While Availability Zones are interconnected by low-latency links, this does not mean they share resources during failures. The purpose of these links is to facilitate replication and communication, not resource sharing during outages.