Learn the key differences between AWS Regions and Availability Zones and how they enable high availability and fault tolerance in the AWS global infrastructure.
Table of Contents
Question
Which statement is true for the AWS global infrastructure?
A. An Availability Zone consists of a single Region.
B. An Availability Zone consists of two or more Regions.
C. A Region consists of two or more Availability Zones.
D. A Region consists of a single Availability Zone.
Answer
C. A Region consists of two or more Availability Zones.
Explanation
The correct response option is Region consists of two or more Availability Zones.
For example, the South America (Sao Paulo) Region is sa-east-1. It includes three Availability Zones: sa-east-la, sa-east-1b, and sa-east-1c.
In the AWS global infrastructure:
- Regions are geographic areas, each consisting of 2 or more isolated Availability Zones. Examples of Regions include us-east-1 (N. Virginia), eu-west-2 (London), ap-southeast-2 (Sydney) etc.
- An Availability Zone (AZ) is one or more discrete data centers within a Region, each with redundant power, networking, and connectivity, housed in separate facilities. AZs are physically separated by a meaningful distance, many kilometers, from any other AZ, although all are within 100 km (60 miles) of each other.
- A single AZ can’t constitute a Region. Regions provide the top level of redundancy and high availability, with each Region consisting of at least 2 geographically dispersed AZs to enable fault tolerance.
- So the correct statement is that a Region consists of two or more Availability Zones, not the other way around. Having multiple AZs in a Region allows you to operate production applications and databases that are more highly available, fault tolerant, and scalable than would be possible from a single data center.
The key points are that Regions contain multiple AZs to provide redundancy and failover capabilities, while AZs do not span multiple Regions. Let me know if you need any clarification or have additional questions!
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