DEA-C01 - Exam Strategy¶

Exam logistics¶

• Duration: 130 minutes
• Questions: 65 (50 scored + 15 unscored)
• Pace target: ~2 minutes per question. Slightly less if you want a buffer for review.
• Format: Multiple choice (one correct) and multiple response (two or three correct, marked).
• Delivery: Pearson VUE testing center or online proctoring.
• Passing score: 720 / 1000 (scaled).

Three-pass approach¶

Pass 1 - First sweep (90 minutes)¶

• Read each question carefully once.
• If you know the answer in <90 seconds, mark and move on.
• If you don't, flag and skip. Don't burn time on hard ones in pass 1.
• Aim to finish pass 1 in 90 minutes. That leaves 40 minutes for hard items.

Pass 2 - Hard items (35 minutes)¶

• Return to flagged questions.
• For each, eliminate clearly wrong answers first.
• If two options remain, look for specific qualifiers in the prompt: "most cost-effective," "lowest latency," "least operational overhead," "fully managed."
• These qualifiers usually disambiguate.

Pass 3 - Review (5 minutes)¶

• Skim all marked questions. Don't second-guess unless you spot a clear error.
• Trust your first instinct unless you find a concrete reason to change.

Question-reading discipline¶

Key qualifiers and their meanings¶

Common traps¶

1. Self-managed when serverless exists. "Run Spark on EC2" is rarely the right answer when Glue or EMR Serverless solves the same problem.
2. Plain Parquet when Iceberg is better. Iceberg is the modern lakehouse default; if the question mentions ACID, schema evolution, or time travel, Iceberg is correct.
3. Lambda for >15-minute jobs. Lambda has a 15-minute hard cap. "Long-running ETL" rules it out.
4. DAS-C01 / DBS-C01 services. Some questions reference still-current services (Redshift, EMR) but watch for distractor answers using retired services.
5. Mixing storage class with retrieval requirement. Glacier Deep Archive cannot serve a "queries must complete in seconds" requirement.
6. Confusing Gateway and Interface VPC endpoints. S3 and DynamoDB are Gateway (free); everything else is Interface (paid).
7. Misreading "must" vs "should." "Must encrypt" rules out unencrypted options absolutely; "should be cost-effective" is a tiebreaker, not a hard requirement.

Domain-specific tactics¶

Domain 1 (34%) - Ingestion and Transformation¶

This domain has the most questions and the most service choices. Memorize the decision flowchart in notes/06-architecture-patterns.md. Common confusions:

• KDS vs Firehose vs MSK - latency tier and management overhead
• Glue vs EMR vs Lambda - workload size and infra preference
• Step Functions vs MWAA - AWS-native vs Airflow-native

Domain 2 (26%) - Data Stores¶

Memorize:

• Six S3 storage classes and their min-duration / retrieval characteristics
• Redshift: RA3 vs DC2 vs Serverless decision
• Iceberg vs Hudi vs Delta differentiation
• DynamoDB: on-demand vs provisioned, GSI vs LSI

Domain 3 (22%) - Operations¶

Common patterns:

• CloudWatch alarm targets (Glue/EMR/Step Functions state metrics)
• Athena workgroup data limits
• Glue Data Quality with DQDL

Domain 4 (18%) - Security and Governance¶

Smallest domain but precise. Memorize:

• IAM + Lake Formation layered model
• Encryption hierarchy (SSE-S3 / SSE-KMS / DSSE-KMS)
• VPC endpoints (Gateway = S3/DynamoDB, Interface = everything else)
• Lake Formation column / row / cell-level + LF-Tags

Time management¶

• Don't spend more than 3 minutes on any single question. If you can't answer in 3, flag and move on.
• Watch the clock in 30-minute segments. After 30 minutes you should be at q15 or further.
• Plan to finish pass 1 with at least 30 minutes left.
• Save 5 minutes at the end for a final review of flagged items.

What to do the day before¶

• Don't cram. Sleep matters more than another mock exam.
• Re-read the fact-sheet.md "Highest-yield study facts" section.
• Skim notes/06-architecture-patterns.md decision flowcharts.
• Confirm exam-day logistics (location, ID, time, online check-in process if remote).

What to do the day of¶

Online proctoring¶

• Quiet, well-lit room
• Clean desk - no notes, no second monitor
• Government-issued photo ID
• 30-minute buffer for check-in
• Stable internet (wired Ethernet preferred)

Testing center¶

• Government-issued photo ID
• Arrive 30 minutes early
• Lockers usually available for personal items

During the exam¶

• Read every word, especially the qualifier
• If two answers seem equally correct, the prompt has a tiebreaker - find it
• Don't change answers without a concrete reason
• Take a 30-second mental break at q33 (halfway)

After the exam¶

• Score appears within minutes for online; same-day email for testing centers
• Detailed score report (pass/fail per domain) appears within 1-5 days
• If you fail, the score report tells you which domains were weakest - use that to plan a re-test (24-hour retake wait)

Common reasons people fail¶

1. Underestimating Domain 1 (34%) - if Domain 1 is your weakest, you can't pass even if all others are strong.
2. Surface-level Lake Formation knowledge - row/column/cell + LF-Tags appear repeatedly.
3. Confusing retired services with current services - DAS-C01 vintage answers won't be correct.
4. Skipping hands-on labs - the exam is scenario-based; reading isn't enough.
5. Cramming the night before - you need fresh recall, not exhausted recognition.

Good luck. The DEA-C01 is one of the most useful current AWS Associate certs. Once you pass, look at SAA-C03 (architectural framing) and MLA-C01 (ML pipelines) as natural complements.