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AGC AWS Certified Solutions Architect Associate > Chapter 5 - S3 > Flashcards

Chapter 5 - S3 Flashcards

1
Q

What does S3 stand for?

A

Simple Storage Service

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2
Q

What type of storage is S3?

A

Object-based storage.
“Flat files” that don’t change, such as text documents, videos, websites, etc.
Databases are NOT flat files.

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3
Q

What are the basic characteristics of S3?

A
  • Object-based
  • File size of 0 Bytes to 5 TB
  • Unlimited storage
  • Files stored in Buckets (aka Folder, Directory, etc)
  • Uses “Universal Namespace”. The name must be unique globally.
  • Successful upload of a file will result in a “HTTP 200 code”
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4
Q

How are S3 Objects identified?

A

S3 Objects are identified by Key:Value Pairs with the Key being the name of the object and the Value being the data in a sequence of bytes.

They will also contain a Version ID, Metadata and Subresources such as Access Control Lists and Torrents.

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5
Q

How is Data Consistency handled for S3?

A

Read after Write consistency for PUTS of NEW Objects is:
Immediate Read after Write

Eventual Consistency for OVERWRITE PUTS and DELETES:
Can take some time to propagate (few seconds)
May NOT be able to Read immediately after Write.
May STILL be able to Read after Delete.

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6
Q

What are the basic features of S3?

A
  • Tiered Storage Available
  • Lifecycle Management
  • Versioning
  • Encryption
  • Secure data using Server-Side Encryption, Access Control Lists and Bucket Policies
    *Data Consistency Model
    *After a successful write of a new object (PUT) or an overwrite of an existing object, any subsequent read request immediately
    receives the latest version of the object.
    Strong consistency for list operations, so after a write, you can immediately perform a listing of the objects in a bucket with all changes reflected.
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7
Q

What are the basic features of S3?

A
  • Tiered Storage Available
  • Lifecycle Management
  • Versioning
  • Encryption
  • Secure data using Server-Side Encryption, Access Control Lists and Bucket Policies
    *Data Consistency Model
    • After a successful write of a new object (PUT) or an overwrite of an existing object, any subsequent read request immediately
      receives the latest version of the object.
    • Strong consistency for list operations, so after a write, you can immediately perform a listing of the objects in a bucket with all
      changes reflected.
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8
Q

Are Buckets public or private by default?

A

Private

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9
Q

How do Object ACLs and Bucket Policies differ?

A 
Object ACLs (Access Control Lists) are for individual objects.
Bucket policies are for entire buckets.
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10
Q

How do you know if an upload of a file has been successful?

A

An HTTP 200 status code is received as a result of a successful upload (PUT).

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11
Q

Are Buckets public or private by default?

A

Private

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12
Q

How do Object ACLs and Bucket Policies differ?

A 
Object ACLs (Access Control Lists) are for individual objects.
Bucket policies are for entire buckets.
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13
Q

How do you know if an upload of a file has been successful?

A

An HTTP 200 status code is received as a result of a successful upload (PUT).

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14
Q

What type of websites can be hosted on S3?

A

You can use S3 to host static websites, such as .html sites.

Dynamic websites, such as those that require database connections, cannot be hosted on S3.

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15
Q

How does S3 handle scaling of websites?

A

S3 scales automatically to meet demand. Many enterprises will put static websites on S3 when they think there is going to be a large number of requests.

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16
Q

What is Versioning?

A

Version control of your objects or files.

17
Q

What are the advantages of Versioning?

A
  • All versions of an object are stored in S3. This includes all writes and even if you delete an object.
  • Can be a great backup tool.
  • Once enabled, versioning cannot be disabled, only suspended.
  • Can be integrated with lifecycle rules.
  • Can support multi-factor authentication.
18
Q

How are versions of objects or files listed in AWS?

A 
In a reverse chronological file tree.
Example:
     * Delete Marker
          * Version 3
               * Version 2
                    * Version 1
19
Q

Are old versions public by default?

A

No.
Even when you have a policy that enables all objects in a bucket to be public, it doesn’t apply to previous versions of those objects. You must manually make older versions public.

20
Q

With Versioning enabled, what happens when you delete an object in AWS?

A

The system does not actually delete the object but rather inserts a Delete Marker at the top of the file tree making the object inaccessible

21
Q

With Versioning enabled, how do you make a deleted object accessible again?

A

You must delete the Delete Marker.

22
Q

List the S3 storage classes:

A
  • S3 Standard
  • S3 Standard - IA (Infrequent Access)
  • S3 One Zone - IA (Infrequent Access)
  • Glacier
  • Glacier Deep Archive
  • S3 - Intelligent Tiering
  • S3 Outposts
23
Q

What are the characteristics of S3 Standard?

A 
Availability
     99.99%
Durability
     11 9’s
Availability Zones (AZs)
     >= 3
Use Case
     Suitable for most workloads (e.g. websites, content distribution, mobile and gaming applications, and big data analytics)
24
Q

What are the characteristics of S3 Standard - IA (Infrequent Access)?

A 
Availability
     99.9%
Durability
     11 9’s
Availability Zones (AZs)
     >= 3
Use Case
     Long term, infrequently accessed critical data (e.g. backups, data store for disaster recovery files, etc)
25
Q

What are the characteristics of S3 One Zone - IA (Infrequent Access)?

A 
Availability
     99.5%
Durability
     11 9’s
Availability Zones (AZs)
     >= 1
Use Case
     Long-term, infrequently accessed, non-critical data
26
Q

What are the characteristics of Glacier?

A 
Availability
     99.99%
Durability
     11 9’s
Availability Zones (AZs)
     >= 3
Use Case
     Long-term data archiving that occasionally needs to be accessed within a few hours or minutes
27
Q

What are the characteristics of Glacier Deep Archive?

A 
Availability
     99.99%
Durability
     11 9’s
Availability Zones (AZs)
     >= 3
Use Case
     Rarely accessed data archiving with a default retrieval time of 12 hours (e.g. financial records for regulatory purposes)
28
Q

What are the characteristics of S3 - Intelligent Tiering?

A 
Availability
     99.9%
Durability
     11 9’s
Availability Zones (AZs)
     >= 3
Use Case
     Unknown or unpredictable access patterns
29
Q

What are the characteristics of S3 Outposts?

A

Amazon S3 on Outposts delivers object storage to your on-premises AWS Outposts environment to meet local data processing and data residency needs.

Mentioned in the Cloud Practitioner course as a new service.
Not mentioned in Solutions Architect Associate course.

30
Q

What are the 3 advantages / benefits of Lifecycle Management?

A
  • Automates moving your object between the different storage tiers thereby maximizing your cost effectiveness.
  • Can be combined with Versioning to move different versions of objects to different storage tiers.
  • Can be applied to current versions or previous versions.

AGC AWS Certified Solutions Architect Associate (34 decks)

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