A trainer is checking how learners understand the parts of the AWS global infrastructure and the relationships among Regions, Availability Zones and edge locations. Which two of the following statements are accurate? (Select TWO.)
- AAn AWS Region contains multiple Availability Zones, which are physically separate groups of data centres within that Region Correct
- BEdge locations are sites near users that cache copies of content so that nearby users receive it with lower latency Correct
- CAn Availability Zone is a single building, and one such building always spans several AWS Regions at once
- DEdge locations are where applications run their primary compute and store the original master copies of their data
- EPlacing resources in two Availability Zones in one Region protects the application if that whole Region becomes unavailable
Why A is correct: A Region is made up of several isolated Availability Zones, so spreading resources across them gives high availability within one Region.
Why B is correct: Edge locations sit close to end users and serve cached content, which reduces latency without the request travelling back to the origin Region.
Why C is wrong: An Availability Zone is one or more data centres inside a single Region and never spans multiple Regions, so this confuses the scope of the two terms.
Why D is wrong: Primary compute and master data live in a Region's Availability Zones, while edge locations only cache content, so this overstates what edge locations do.
Why E is wrong: Two Availability Zones guard against a zone failure but sit inside the same Region, so surviving a full Region outage instead requires a second Region.