The correct answer is that the policy allows users to read items in the Orders table only if the partition key matches their Cognito identity ID. This is achieved through the `dynamodb:LeadingKeys` condition key, which enforces fine-grained access control by restricting operations to rows where the partition key value equals the caller’s `cognito-identity.amazonaws.com:sub` claim. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how IAM conditions can limit DynamoDB access at the item level without requiring a separate table per user. A common trap is assuming the policy grants full table access or allows writes; in reality, it only permits `GetItem` and `Query` actions on matching partition keys, explicitly denying `Scan` and write operations. Memory tip: think of `LeadingKeys` as a “key leader” that only lets you into the row where your identity is the leader of the partition key.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Users can read items in the Orders table only if the partition key matches their Cognito identity ID.
Option A is correct because the policy uses 'dynamodb:LeadingKeys' condition to restrict access to items where the partition key equals the Cognito identity ID (sub). This provides fine-grained access control. Option B is wrong because it allows only GetItem and Query, not Scan. Option C is wrong because it restricts to a specific table. Option D is wrong because it does not allow writes.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Users can read and write items in the Orders table where the partition key matches their Cognito identity ID.
Why it's wrong here
The policy only allows read actions, not write.
✗
Users can read any item in the Orders table using GetItem and Query.
Why it's wrong here
The condition restricts to items with a specific partition key.
✗
Users can scan the entire Orders table but only if they use a filter expression.
Why it's wrong here
Scan is not allowed, and the condition only applies to GetItem and Query.
✓
Users can read items in the Orders table only if the partition key matches their Cognito identity ID.
Why this is correct
The LeadingKeys condition restricts based on the partition key equal to the Cognito sub.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Users can read items in the Orders table only if the partition key matches their Cognito identity ID. — Option A is correct because the policy uses 'dynamodb:LeadingKeys' condition to restrict access to items where the partition key equals the Cognito identity ID (sub). This provides fine-grained access control. Option B is wrong because it allows only GetItem and Query, not Scan. Option C is wrong because it restricts to a specific table. Option D is wrong because it does not allow writes.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This DEA-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 DEA-C01 exam.
Question Discussion
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