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Data Engineering →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is to use AWS Transfer Family for SFTP to Redshift batch ingestion, combined with the Redshift COPY command. This is correct because Transfer Family provides a fully managed SFTP endpoint that automatically deposits files into S3, while the COPY command is purpose-built for efficiently loading large CSV files—like the 2-3 GB daily batches—directly from S3 into Redshift without intermediate processing. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of batch data pipeline design versus streaming or serverless limitations; a common trap is choosing Lambda, which fails due to its 15-minute timeout and 6 MB payload cap, or Kinesis, which is meant for real-time streams, not daily file transfers. Remember that for scheduled, large-file SFTP ingestion, Transfer Family plus COPY is the only service combination that handles both the protocol and the bulk load natively. Memory tip: “SFTP to S3, then COPY to Redshift—batch needs big pipes, not tiny Lambda trips.”

MLS-C01 Data Engineering Practice Question

This MLS-C01 practice question tests your understanding of data engineering. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A data engineer needs to design a data pipeline that ingests CSV files from an SFTP server daily, transforms them, and loads them into Amazon Redshift. The files are typically 2-3 GB. Which combination of AWS services is MOST appropriate?

Question 1mediummultiple choice

Read the full NAT/PAT explanation →

A
Use AWS Glue ETL with a JDBC connection to the SFTP server to read files directly.
Why wrong: Glue does not natively support SFTP as a data source; JDBC is for databases, not file transfers.
B
Use AWS Lambda to download the files from SFTP, transform them in memory, and write to Redshift using the Data API.
Why wrong: Lambda has execution time and memory limits; large files would cause timeouts.
C
Use AWS Transfer Family to automate SFTP file retrieval to S3, then use Redshift COPY to load data.
Transfer Family handles SFTP natively, and COPY loads data efficiently into Redshift.
D
Use Amazon Kinesis Data Firehose with an HTTP endpoint source to receive files from SFTP.
Why wrong: Firehose is designed for streaming data, not for receiving large files via SFTP.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Use AWS Transfer Family to automate SFTP file retrieval to S3, then use Redshift COPY to load data.

Option D is correct because AWS Transfer Family provides SFTP integration, and Amazon Redshift COPY command efficiently loads large files from S3. Option A is wrong because Lambda has a 15-minute timeout and 6 MB payload limit for invocation. Option B is wrong because Glue ETL can read from S3 but does not directly connect to SFTP. Option C is wrong because Kinesis is for streaming, not batch file transfers.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Use AWS Glue ETL with a JDBC connection to the SFTP server to read files directly.
Why it's wrong here
Glue does not natively support SFTP as a data source; JDBC is for databases, not file transfers.
✗
Use AWS Lambda to download the files from SFTP, transform them in memory, and write to Redshift using the Data API.
Why it's wrong here
Lambda has execution time and memory limits; large files would cause timeouts.
✓
Use AWS Transfer Family to automate SFTP file retrieval to S3, then use Redshift COPY to load data.
Why this is correct
Transfer Family handles SFTP natively, and COPY loads data efficiently into Redshift.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use Amazon Kinesis Data Firehose with an HTTP endpoint source to receive files from SFTP.
Why it's wrong here
Firehose is designed for streaming data, not for receiving large files via SFTP.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related MLS-C01 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this MLS-C01 question test?

Data Engineering — This question tests Data Engineering — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Use AWS Transfer Family to automate SFTP file retrieval to S3, then use Redshift COPY to load data. — Option D is correct because AWS Transfer Family provides SFTP integration, and Amazon Redshift COPY command efficiently loads large files from S3. Option A is wrong because Lambda has a 15-minute timeout and 6 MB payload limit for invocation. Option B is wrong because Glue ETL can read from S3 but does not directly connect to SFTP. Option C is wrong because Kinesis is for streaming, not batch file transfers.

What should I do if I get this MLS-C01 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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This MLS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MLS-C01 exam.