S3 storage classes (Standard, IA, Glacier) in AWS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the S3 storage class for standard storage.

AWS

aws s3 cp file.txt s3://mybucket/ --storage-class [1]

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

AONEZONE_IA

BGLACIER

CREDUCED_REDUNDANCY

DSTANDARD

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing GLACIER for frequently accessed data causes slow retrieval.

The STANDARD storage class is the default for frequently accessed data in S3.

2fill in blank

medium

Complete the code to specify the S3 storage class for infrequent access.

AWS

aws s3 cp file.txt s3://mybucket/ --storage-class [1]

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

AONEZONE_IA

BGLACIER

CSTANDARD_IA

DSTANDARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using GLACIER instead causes longer retrieval times.

STANDARD_IA is for data accessed less frequently but requires rapid access when needed.

3fill in blank

hard

Fix the error in the storage class name to use Glacier archival storage.

AWS

aws s3 cp file.txt s3://mybucket/ --storage-class [1]

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

AGLACIER

BSTANDARD_IA

CGLACIER_IR

DONEZONE_IA

Attempts:

3 left

💡 Hint

Common Mistakes

Using GLACIER_IR when standard Glacier is required.

GLACIER is the correct storage class for archival with longer retrieval times.

4fill in blank

hard

Fill both blanks to set the storage class to One Zone-Infrequent Access and enable encryption.

AWS

aws s3 cp file.txt s3://mybucket/ --storage-class [1] --sse [2]

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

AONEZONE_IA

BAES256

CSTANDARD_IA

Daws:kms

Attempts:

3 left

💡 Hint

Common Mistakes

Using STANDARD_IA instead of ONEZONE_IA or wrong encryption flag.

ONEZONE_IA stores data in one availability zone for lower cost, and AES256 enables server-side encryption with Amazon S3-managed keys.

5fill in blank

hard

Fill all three blanks to copy a file to Glacier storage with KMS encryption and specify the storage class.

AWS

aws s3 cp file.txt s3://mybucket/ --sse [1] --storage-class [2] --metadata-directive [3]

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

Aaws:kms

BGLACIER

CREPLACE

DAES256

Attempts:

3 left

💡 Hint

Common Mistakes

Using AES256 instead of aws:kms or missing metadata directive.

aws:kms enables KMS encryption, GLACIER sets the archival storage class, and REPLACE tells S3 to replace metadata during the copy.

Practice

1. Which Amazon S3 storage class is best for data that you access frequently and need immediately?

easy

A. GLACIER

B. STANDARD_IA (Infrequent Access)

C. ONEZONE_IA

D. STANDARD

Solution

1. Step 1: Understand S3 storage classes purpose

   STANDARD is designed for frequently accessed data with low latency.

2. Step 2: Compare with other classes

   STANDARD_IA and GLACIER are for less frequent access and have retrieval delays.

3. Final Answer:

   STANDARD -> Option D

4. Quick Check:

   Frequent access = STANDARD [OK]

Hint: Frequent use? Pick STANDARD for fastest access [OK]

Common Mistakes:

• Choosing GLACIER for frequent access
• Confusing STANDARD_IA with STANDARD
• Ignoring retrieval delays in GLACIER

2. Which of the following is the correct way to specify the STANDARD_IA storage class in an AWS CLI command to upload a file?

easy

A. aws s3 cp file.txt s3://bucket/ --storage-class=STANDARDIA

B. aws s3 cp file.txt s3://bucket/ --storageclass STANDARD_IA

C. aws s3 cp file.txt s3://bucket/ --storage-class STANDARD_IA

D. aws s3 cp file.txt s3://bucket/ --storage-class=STANDARD-IA

Solution

1. Step 1: Recall AWS CLI syntax for storage class

   The correct option uses '--storage-class' with underscore and exact class name.

2. Step 2: Check each option for syntax errors

   aws s3 cp file.txt s3://bucket/ --storage-class STANDARD_IA matches correct syntax; others have typos or wrong format.

3. Final Answer:

   aws s3 cp file.txt s3://bucket/ --storage-class STANDARD_IA -> Option C

4. Quick Check:

   Correct flag and class name = aws s3 cp file.txt s3://bucket/ --storage-class STANDARD_IA [OK]

Hint: Use '--storage-class' exactly with underscore [OK]

Common Mistakes:

• Misspelling the flag as '--storageclass'
• Using dashes instead of underscores
• Omitting the space after the flag

3. You upload a 1 GB file to S3 using the GLACIER storage class. What happens when you try to access the file immediately after upload?

medium

A. The file is instantly available for download.

B. The file is available after a retrieval delay of several hours.

C. The file is deleted automatically after 24 hours.

D. The file is available only if you pay an extra fee upfront.

Solution

1. Step 1: Understand GLACIER retrieval behavior

   GLACIER stores data for long-term archiving with retrieval delays of hours.

2. Step 2: Check immediate access options

   Immediate access is not possible; retrieval requires a job that takes time.

3. Final Answer:

   The file is available after a retrieval delay of several hours. -> Option B

4. Quick Check:

   GLACIER retrieval delay = hours [OK]

Hint: GLACIER files need hours to retrieve, not instant [OK]

Common Mistakes:

• Assuming instant access like STANDARD
• Thinking files auto-delete after upload
• Believing extra upfront fees enable instant access

4. A user tries to upload a file to S3 with the command: aws s3 cp data.csv s3://mybucket/ --storage-class GLACIER but gets an error. What is the likely cause?

medium

A. GLACIER is not a valid storage class for direct upload via this command.

B. The bucket name is invalid.

C. The file data.csv does not exist locally.

D. The AWS CLI version does not support storage classes.

Solution

1. Step 1: Understand GLACIER upload restrictions

   GLACIER storage class cannot be used directly in 'aws s3 cp' uploads; use GLACIER via lifecycle or multipart upload.

2. Step 2: Check other options

   Bucket name and file existence errors produce different messages; CLI supports storage classes.

3. Final Answer:

   GLACIER is not a valid storage class for direct upload via this command. -> Option A

4. Quick Check:

   Direct upload with GLACIER = error [OK]

Hint: GLACIER needs lifecycle or special upload, not direct CLI copy [OK]

Common Mistakes:

• Assuming GLACIER can be set directly on upload
• Ignoring file existence errors
• Blaming bucket name without checking

5. You want to store 10 TB of backup data that you rarely access but must keep for years. You want to minimize cost but still be able to retrieve data within a few hours if needed. Which S3 storage class should you choose and why?

hard

A. STANDARD_IA, because it balances lower cost with quick access.

B. STANDARD, because it offers instant access despite higher cost.

C. GLACIER, because it is the cheapest but retrieval takes days.

D. GLACIER INSTANT RETRIEVAL, because it offers low cost and milliseconds access.

Solution

1. Step 1: Analyze access frequency and retrieval time needs

   Data is rarely accessed but must be retrievable within hours, not instantly.

2. Step 2: Compare storage classes for cost and retrieval speed

   STANDARD_IA offers lower cost than STANDARD and retrieval in milliseconds to seconds; GLACIER has longer retrieval times.

3. Final Answer:

   STANDARD_IA, because it balances lower cost with quick access. -> Option A

4. Quick Check:

   Rare access + quick retrieval = STANDARD_IA [OK]

Hint: Rare access + hours retrieval? Pick STANDARD_IA [OK]

Common Mistakes:

• Choosing GLACIER despite slow retrieval
• Picking STANDARD and paying too much
• Confusing GLACIER INSTANT RETRIEVAL (not standard GLACIER)