S3

Question 1

What is Amazon S3?

Answer 1

A highly scalable, durable object storage service used to store and retrieve any amount of data from anywhere on the web.

Question 2

What does S3 stand for?

Answer 2

Simple Storage Service.

Question 3

What type of storage is S3?

Answer 3

Object storage.

Question 4

What is the basic unit of storage in S3?

Answer 4

An object.

Question 5

What contains S3 objects?

Answer 5

Buckets.

Question 6

What is the maximum size of a single S3 object?

Answer 6

5 TB.

Question 7

What is the maximum size of a single PUT operation?

Answer 7

5 GB.

Question 8

What is the maximum number of S3 buckets per account by default?

Answer 8

100

Question 9

Name the main S3 storage classes.

Answer 9

S3 Standard, S3 Intelligent-Tiering, S3 Standard-IA, S3 One Zone-IA, S3 Glacier Instant Retrieval, S3 Glacier Flexible Retrieval, S3 Glacier Deep Archive.

Question 10

Which S3 class is best for frequently accessed data?

Answer 10

S3 Standard.

Question 11

Which S3 class automatically moves data between access tiers?

Answer 11

S3 Intelligent-Tiering.

Question 12

Which S3 class stores data in a single AZ?

Answer 12

S3 One Zone-IA.

Question 13

Which S3 class has the lowest cost for rarely accessed data?

Answer 13

S3 Glacier Deep Archive.

Question 14

What does S3 Versioning do?

Answer 14

Keeps multiple versions of an object in the same bucket.

Question 15

What happens when you delete a versioned object?

Answer 15

A delete marker is added; object is not actually deleted.

Question 16

What are the two types of encryption in S3?

Answer 16

Server-side encryption (SSE) and client-side encryption.

Question 17

Name the three SSE options in S3.

Answer 17

SSE-S3, SSE-KMS, SSE-C.

Question 18

What is an S3 Lifecycle Policy?

Answer 18

A set of rules to automate transition or expiration of objects.

Question 19

What are the main ways to control access to S3?

Answer 19

IAM policies, bucket policies, ACLs.

Question 20

What is the preferred way to control access to S3?

Answer 20

IAM policies.

Question 21

What are S3 Access Control Lists (ACLs)?

Answer 21

Legacy access control mechanism to grant read/write permissions.

Question 22

What is a bucket policy?

Answer 22

A resource-based policy attached directly to a bucket.

Question 23

What does ‘Block Public Access’ do?

Answer 23

Prevents public access to buckets and objects regardless of ACLs or policies.

Question 24

What is S3 Transfer Acceleration?

Answer 24

Speeds up uploads and downloads using Amazon CloudFront edge locations.

Question 25

What is S3 Event Notification?

Answer 25

Triggers notifications when certain events happen in a bucket.

Question 26

What is S3 Select?

Answer 26

Retrieves a subset of data from an object using SQL expressions.

Question 27

What is Multipart Upload?

Answer 27

Allows uploading parts of a large object in parallel.

Question 28

What is a presigned URL?

Answer 28

A URL that grants temporary access to an S3 object.

Question 29

Is S3 data encrypted by default?

Answer 29

No, but encryption can be enabled.

Question 30

What is the difference between SSE-S3 and SSE-KMS?

Answer 30

SSE-S3 uses S3-managed keys, SSE-KMS uses customer-managed keys via KMS.

Question 31

What AWS service can help monitor access to S3?

Answer 31

AWS CloudTrail.

Question 32

How can you restrict access to S3 by IP address?

Answer 32

Using bucket policies with IP conditions.

Question 33

How is S3 designed for durability?

Answer 33

99.999999999% durability over a given year (11 9s).

Question 34

How can you improve S3 performance for frequent access?

Answer 34

Use S3 Intelligent-Tiering or caching layers.

Question 35

What is the benefit of S3 Intelligent-Tiering?

Answer 35

Automatically optimizes costs by moving data between tiers based on access patterns.

Question 36

How are S3 costs calculated?

Answer 36

Based on storage used, requests made, and data transferred.

Question 37

Which S3 feature helps automate cost savings?

Answer 37

Lifecycle policies and Intelligent-Tiering.

Question 38

Which class is cheapest for long-term archive?

Answer 38

S3 Glacier Deep Archive.

Question 39

What’s a common anti-pattern with S3 versioning?

Answer 39

Letting versions accumulate without lifecycle policies, leading to cost increase.

Question 40

What is a security anti-pattern in S3?

Answer 40

Leaving buckets publicly accessible without monitoring.

Question 41

What’s a best practice for public content distribution from S3?

Answer 41

Use S3 with CloudFront for secure and fast distribution.