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CLF-003
Which of the following best describes a Region in the AWS global infrastructure?
Choices
Explanation and answer
Read the explanation and correct answer (spoiler — try answering first)
Correct answer: B. A geographic area that contains one or more Availability Zones.
Explanation
A Region is a geographic area such as the Tokyo Region or the US East (N. Virginia) Region. Each Region contains multiple Availability Zones.
Per-choice explanations
A. A single physical server.
Incorrect. A Region is not a single server.
B. A geographic area that contains one or more Availability Zones.
Correct. A Region is a geographic area that contains multiple AZs.
C. A unit for managing IAM users.
Incorrect. IAM is a global service and is a separate concept from a Region.
D. A folder inside an S3 bucket.
Incorrect. This has nothing to do with the folder-like view in S3.
Practical Use
A Region is the top-level unit of the AWS global infrastructure and refers to an independent group of infrastructure located in a specific geographic area in the world. Representative examples include Tokyo (ap-northeast-1), Osaka (ap-northeast-3), US East (N. Virginia, us-east-1), and Europe (Ireland, eu-west-1). Each Region consists of multiple Availability Zones (AZs), and Regions are isolated from each other physically, in terms of power, and in terms of network. The criteria for choosing a Region in practice are geographic proximity to users (latency), laws and internal policies on data residency, the availability of the services you want to use, and price differences across Regions. Two points require special attention in practice when selecting a Region: there are differences in service availability across Regions, and some services are global services that operate across Regions. IAM, Route 53, CloudFront, and AWS Organizations are treated as global services. You either do not specify a Region for them or you must operate them in a specific fixed Region (for example, ACM certificates for CloudFront must be in us-east-1). In addition, data transfer between Regions incurs charges, so when you design cross-Region copies for backup purposes, you need to estimate the transfer volume and frequency. On CLF-C02, the relationship between Regions, AZs, and edge locations appears frequently. Regions are tested as geographic areas containing multiple AZs, AZs as isolated facilities composed of one or more data centers, and edge locations as delivery points used by services such as CloudFront. There are many distractors that ask you to choose conceptually unrelated items, such as a single physical server, a unit for managing IAM users, or a folder inside S3.