AWS S3 Quiz

What is an S3 Bucket and an S3 Object?

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  An S3 Bucket is a container for S3 Objects. An S3 Object is a file.

• An S3 Bucket is a container for S3 Objects. An S3 Object is a file and associated metadata.

• An S3 Bucket is a container for S3 Objects. An S3 Object is a file, associated metadata, and Object tags.

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  An S3 Bucket is a container for S3 Objects. An S3 Object is a file, associated metadata, Object tags, and access control rules

Answer explanation

Explanation:

1. S3 Bucket:

   • A container used to store S3 objects.

   • Acts as the top-level organizational unit in S3.

2. S3 Object:

   • Represents a file stored in a bucket.

   • Includes:

     • File data: The actual content (e.g., a photo, video, or document).

     • Metadata: Information about the file (e.g., size, type, creation date).

     • Object tags: Key-value pairs for categorizing and managing objects.

     • Access control rules: Permissions defining who can access the object.

An early adopter of S3 has a bucket named `irs` located in us-east-1. Now, a US Federal Agency, the Internal Revenue Service, wants to setup a bucket with the same name in US GovCloud. Can this be done?

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  No. S3 Bucket names have to be unique across all accounts and regions.

• No. The rules governing acceptable Bucket names were changed in 2018. Bucket names have to be at least 4 characters long.

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  Yes. As a federal agency, the Internal Revenue Service can ask for the Bucket name to be handed over to them.

• Yes. Bucket names can be reused across different Region partitions. Since us-east-1 is the standard `aws` partition and US GovCloud is in the `aws-us-gov` partition, the same Bucket name of `irs` can be reused in US GovCloud.

Answer explanation

Explanation:

1. Bucket Name Uniqueness:

   • Bucket names must be unique within a partition.

   • AWS has multiple partitions, such as:

     • aws: Standard AWS regions (e.g., us-east-1, eu-west-1).

     • aws-us-gov: AWS GovCloud regions (e.g., us-gov-west-1).

2. Partition Separation:

   • The aws partition (where the original irs bucket exists) and the aws-us-gov partition (where the IRS wants to create a new bucket) are separate.

   • This means the same bucket name (irs) can be used in both partitions without conflict.

3. No Name Handover:

   • Bucket names cannot be "handed over" to another account or agency.

   • The IRS can create a new bucket with the same name in the aws-us-gov partition because it is a separate partition.

4. Bucket Name Rules:

   • The rules governing bucket names (e.g., length, characters) apply uniformly, but they do not prevent reuse across partitions.

Thus, the IRS can create a bucket named irs in the US GovCloud partition (aws-us-gov) even though the same name is already used in the aws partition.

Which of the following is true about Amazon S3 storage classes?

• S3 Standard is designed for frequently accessed data.

• S3 Glacier Instant Retrieval is ideal for data that needs to be accessed in milliseconds.

• S3 Intelligent-Tiering automatically moves data between access tiers based on usage patterns.

• S3 One Zone-IA stores data in a single Availability Zone for cost savings.

Answer explanation

Explanation: S3 Glacier Instant Retrieval is designed for archival data that requires retrieval within milliseconds, but it is not the primary use case. The other options are correct descriptions of S3 storage classes.

What is the maximum size of an object that can be uploaded to Amazon S3 in a single PUT operation?

• 5 GB

• 10 GB

• 100 GB

• 5 TB

Answer explanation

Explanation: The maximum size of an object that can be uploaded in a single PUT operation is 5 TB. For larger objects, multipart upload is required.

Which of the following S3 features can be used to enforce data retention policies?

• S3 Lifecycle Policies

• S3 Object Lock

• S3 Cross-Region Replication

• S3 Versioning

Answer explanation

Explanation: S3 Lifecycle Policies can transition or expire objects based on rules, and S3 Object Lock can prevent objects from being deleted or overwritten for a specified period. Cross-Region Replication and Versioning do not enforce retention policies.

What is the purpose of S3 Cross-Region Replication (CRR)?

• To automatically replicate objects from one S3 bucket to another in a different region.

• To reduce latency by caching objects in edge locations.

• To encrypt data at rest in multiple regions.

• To create a backup of objects in the same region.

Answer explanation

Explanation: S3 Cross-Region Replication is used to automatically replicate objects between buckets in different AWS regions for compliance, latency reduction, or disaster recovery.

Which of the following statements about S3 Versioning is true?

• A. Versioning is enabled by default for all S3 buckets.

• Versioning can be used to recover from accidental deletions or overwrites.

• Versioning increases storage costs because all versions of an object are stored.

• Versioning cannot be disabled once enabled.

Answer explanation

Explanation: Versioning is not enabled by default, and it can be suspended (but not disabled). It helps recover from accidental deletions or overwrites, but it increases storage costs as all versions are stored.

Which of the following S3 storage classes provides the lowest cost for long-term archival data with retrieval times of several hours?

• S3 Standard

• S3 Glacier Flexible Retrieval

• S3 Glacier Deep Archive

• S3 Intelligent-Tiering

Answer explanation

Explanation: S3 Glacier Flexible Retrieval (formerly S3 Glacier) is designed for archival data with retrieval times ranging from minutes to hours, at a lower cost than S3 Standard or Intelligent-Tiering. S3 Glacier Deep Archive is even cheaper but has longer retrieval times.

What is the purpose of an S3 Pre-signed URL?

• To provide public read access to an S3 bucket.

• To allow temporary access to a private S3 object.

• To encrypt data in transit.

• To enable Cross-Region Replication.

Answer explanation

Explanation: A Pre-signed URL allows temporary access to a private S3 object by generating a time-limited URL that can be shared with others.

Which of the following are valid use cases for Amazon S3? (Select TWO.)

• Hosting a static website.

• Running a relational database.

• Storing backups for on-premises applications.

• Processing real-time streaming data.

Answer explanation

Explanation: S3 is commonly used for hosting static websites and storing backups. Running a relational database or processing real-time streaming data are not typical use cases for S3.