Exam Essentials
Understand the difference between durability and availability in S3. Durability is the likelihood that an object won’t be lost over the course of a year. Availability is the percentage of time an object will be accessible during the year.
Be able to select the best S3 storage class given cost, compliance, and availability requirements. S3 offers six storage classes. STANDARD has the highest availability at 99.99 percent, replicates objects across at least three zones, and is the most expensive in terms of monthly storage cost per gigabyte. ONEZONE_IA has the lowest availability at 99.5 percent and stores objects in only one zone, and its monthly per-gigabyte storage cost is less than half that of the STANDARD storage class.
Know the different options for getting data into and out of S3. You can upload or download an object by using the S3 service console, by using the AWS CLI, or by directly accessing the object’s URL. AWS Storage Gateway lets your on-premises...
