Why S3 matters for object storage in AWS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an S3 bucket using AWS CLI.

AWS

aws s3api create-bucket --bucket [1] --region us-east-1

Drag options to blanks, or click blank then click option'

Adelete-bucket

Bus-west-2

Clist-buckets

Dmy-unique-bucket-123

Attempts:

3 left

💡 Hint

Common Mistakes

Using a region name instead of a bucket name.

Using AWS CLI commands unrelated to bucket creation.

The --bucket option requires the bucket name. Here, you provide a unique bucket name like my-unique-bucket-123.

2fill in blank

medium

Complete the code to upload a file to an S3 bucket using AWS CLI.

AWS

aws s3 cp ./photo.jpg s3://[1]/

Drag options to blanks, or click blank then click option'

Amy-bucket

Bus-east-1

Clist-buckets

Ddelete-bucket

Attempts:

3 left

💡 Hint

Common Mistakes

Using region names instead of bucket names.

Using commands that list or delete buckets instead of uploading.

The command uploads photo.jpg to the specified bucket. You must provide the bucket name after s3://.

3fill in blank

hard

Fix the error in the command to list objects in an S3 bucket.

AWS

aws s3api list-objects --bucket [1]

Drag options to blanks, or click blank then click option'

Alist-buckets

Bdelete-bucket

Cmy-bucket

Dcreate-bucket

Attempts:

3 left

💡 Hint

Common Mistakes

Using commands that list or delete buckets instead of specifying the bucket name.

Leaving the bucket name blank.

The --bucket option requires the bucket name to list its objects. Here, my-bucket is the correct bucket name.

4fill in blank

hard

Fill both blanks to configure an S3 bucket policy that allows public read access.

AWS

{
  "Version": "2012-10-17",
  "Statement": [{
    "Effect": "[1]",
    "Principal": "*",
    "Action": "s3:GetObject",
    "Resource": "arn:aws:s3:::[2]/*"
  }]
}

Drag options to blanks, or click blank then click option'

AAllow

BDeny

Cmy-public-bucket

Dprivate-bucket

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Deny' instead of 'Allow' for the effect.

Specifying the wrong bucket name in the resource ARN.

To allow public read access, the Effect must be Allow, and the Resource must specify the bucket name with /* to cover all objects.

5fill in blank

hard

Fill all three blanks to create a lifecycle rule that transitions objects to Glacier after 30 days and expires them after 365 days.

AWS

{
  "Rules": [{
    "ID": "ArchiveAndExpire",
    "Status": "[1]",
    "Filter": {},
    "Transitions": [{
      "Days": [2],
      "StorageClass": "[3]"
    }],
    "Expiration": {
      "Days": 365
    }
  }]
}

Drag options to blanks, or click blank then click option'

AEnabled

B30

CGLACIER

DDisabled

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the rule status to Disabled.

Using incorrect days or storage class values.

The lifecycle rule must be Enabled to work. Objects transition after 30 days to the GLACIER storage class, and expire after 365 days.

Practice

1. What is the main purpose of Amazon S3 in cloud computing?

easy

A. To run virtual servers

B. To store and retrieve files easily

C. To manage databases

D. To monitor network traffic

Solution

1. Step 1: Understand S3's role

   Amazon S3 is designed to store objects like files and data in the cloud.

2. Step 2: Compare with other services

   Unlike servers or databases, S3 focuses on file storage and retrieval.

3. Final Answer:

   To store and retrieve files easily -> Option B

4. Quick Check:

   S3 = File storage [OK]

Hint: S3 is about files, not servers or databases [OK]

Common Mistakes:

• Confusing S3 with compute services
• Thinking S3 manages databases
• Assuming S3 monitors networks

2. Which of the following is the correct way to create a new S3 bucket using AWS CLI?

easy

A. aws s3 mb s3://my-bucket

B. aws s3 make-bucket --name my-bucket

C. aws s3 new-bucket my-bucket

D. aws s3 create-bucket --bucket my-bucket

Solution

1. Step 1: Recall AWS CLI syntax for bucket creation

   The correct command uses 'mb' (make bucket) with the bucket URL.

2. Step 2: Check each option

   aws s3 mb s3://my-bucket matches the correct syntax: 'aws s3 mb s3://my-bucket'. Others are invalid commands.

3. Final Answer:

   aws s3 mb s3://my-bucket -> Option A

4. Quick Check:

   Bucket creation CLI = aws s3 mb [OK]

Hint: 'mb' means make bucket in AWS CLI [OK]

Common Mistakes:

• Using 'create-bucket' instead of 'mb'
• Omitting 's3://' prefix
• Using non-existent commands like 'new-bucket'

3. Given this AWS CLI command:
aws s3 cp file.txt s3://my-bucket/
What happens after running it?

medium

A. Deletes file.txt from the bucket named my-bucket

B. Downloads file.txt from the bucket named my-bucket

C. Uploads file.txt to the bucket named my-bucket

D. Lists contents of my-bucket

Solution

1. Step 1: Understand the 'cp' command in AWS CLI

   'cp' means copy. Here it copies a local file to the S3 bucket.

2. Step 2: Analyze source and destination

   Source is local file 'file.txt', destination is 's3://my-bucket/', so it uploads the file.

3. Final Answer:

   Uploads file.txt to the bucket named my-bucket -> Option C

4. Quick Check:

   aws s3 cp local to s3 = upload [OK]

Hint: 'cp' copies files; source to destination [OK]

Common Mistakes:

• Confusing upload with download
• Thinking 'cp' deletes files
• Assuming it lists bucket contents

4. You tried to upload a file to S3 but got an error: AccessDenied. What is the most likely cause?

medium

A. The AWS CLI is not installed

B. The bucket does not exist

C. The file path is incorrect

D. You lack permission to write to the bucket

Solution

1. Step 1: Understand the AccessDenied error

   This error means the user does not have permission to perform the action.

2. Step 2: Check other options

   Bucket missing causes NotFound error, wrong file path causes file errors, CLI missing causes command errors.

3. Final Answer:

   You lack permission to write to the bucket -> Option D

4. Quick Check:

   AccessDenied = permission issue [OK]

Hint: AccessDenied means permission problem [OK]

Common Mistakes:

• Assuming bucket absence causes AccessDenied
• Blaming file path for permission errors
• Ignoring user permissions

5. You want to store daily backups in S3 and ensure they are not lost accidentally. Which combination of S3 features should you use?

hard

A. Create a bucket with versioning enabled and lifecycle rules to archive old backups

B. Create a bucket without versioning and delete backups after 7 days

C. Use S3 without buckets and store backups locally

D. Create multiple buckets without any backup policies

Solution

1. Step 1: Identify features for backup safety

   Versioning keeps multiple versions to prevent accidental loss. Lifecycle rules manage storage cost by archiving.

2. Step 2: Evaluate options

   Create a bucket with versioning enabled and lifecycle rules to archive old backups uses versioning and lifecycle rules, best for backup safety and cost. Others lack protection or proper management.

3. Final Answer:

   Create a bucket with versioning enabled and lifecycle rules to archive old backups -> Option A

4. Quick Check:

   Versioning + lifecycle = safe backups [OK]

Hint: Enable versioning to protect backups [OK]

Common Mistakes:

• Not enabling versioning risks data loss
• Deleting backups too soon
• Ignoring lifecycle management