- A
Increase the throughput of the crawler by configuring the 'Schema updates' option
Why wrong: This option does not increase throughput; it controls schema updates.
- B
Enable partition indexing on the table to speed up the crawler
Why wrong: Partition indexing benefits queries, not crawler speed.
- C
Decrease the crawler schedule frequency to every 2 hours to avoid overlapping runs
Why wrong: This would cause the crawler to fall further behind.
- D
Use multiple crawlers, each configured to crawl a different path (e.g., one for year=2023, one for year=2024)
Splitting the crawl scope across crawlers allows parallel execution.
- E
Increase the number of crawler instances by configuring the 'Crawler queue' to process multiple partitions in parallel
Using multiple crawlers can parallelize the work.
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company is using AWS Glue to catalog data stored in Amazon S3. The data is partitioned by year, month, day, and hour. The company runs hourly ETL jobs that add new partitions. The Glue crawler is scheduled to run every hour to update the Data Catalog. However, the crawler is taking longer than expected and is not completing before the next crawler run starts. Which THREE actions could the company take to resolve this issue?
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 multiple crawlers, each configured to crawl a different path (e.g., one for year=2023, one for year=2024)
Options A, C, and D are correct. Increasing the crawler's S3 throughput improves speed. Partition indexing speeds up queries but does not affect crawler speed. Adding more crawlers allows parallel processing. Option B is wrong because partition indexing is for Athena/Redshift, not crawler performance. Option E is wrong because decreasing schedule frequency would increase the backlog.
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.
- ✗
Increase the throughput of the crawler by configuring the 'Schema updates' option
Why it's wrong here
This option does not increase throughput; it controls schema updates.
- ✗
Enable partition indexing on the table to speed up the crawler
Why it's wrong here
Partition indexing benefits queries, not crawler speed.
- ✗
Decrease the crawler schedule frequency to every 2 hours to avoid overlapping runs
Why it's wrong here
This would cause the crawler to fall further behind.
- ✓
Use multiple crawlers, each configured to crawl a different path (e.g., one for year=2023, one for year=2024)
Why this is correct
Splitting the crawl scope across crawlers allows parallel execution.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Increase the number of crawler instances by configuring the 'Crawler queue' to process multiple partitions in parallel
Why this is correct
Using multiple crawlers can parallelize the work.
Related concept
Static NAT maps one inside address to one outside address.
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 multiple crawlers, each configured to crawl a different path (e.g., one for year=2023, one for year=2024) — Options A, C, and D are correct. Increasing the crawler's S3 throughput improves speed. Partition indexing speeds up queries but does not affect crawler speed. Adding more crawlers allows parallel processing. Option B is wrong because partition indexing is for Athena/Redshift, not crawler performance. Option E is wrong because decreasing schedule frequency would increase the backlog.
What should I do if I get this MLS-C01 question wrong?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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