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DEA-C01 Data Operations and Support Practice Question

This DEA-C01 practice question tests your understanding of data operations and support. 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 data engineering team uses AWS Glue ETL jobs to process daily data from an Amazon RDS for PostgreSQL instance into Amazon S3. Recently, the jobs have been failing randomly with the error 'psycopg2.OperationalError: could not connect to server: Connection timed out'. The RDS instance is in a private subnet with a security group that allows inbound traffic from the Glue job's security group on port 5432. The Glue job is configured to use the same VPC, subnet, and security group. The RDS instance has sufficient connections and is not at CPU or memory limits. The failures occur at different times each day, and the job works when retried immediately. Which action should the team take to resolve the issue?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.

A
Set the Glue job timeout to 60 minutes to ensure the job does not fail prematurely.
Why wrong: Incorrect. Increasing the job timeout does not fix intermittent network connectivity; the job would still fail if a timeout occurs.
B
Change the subnet of the Glue job to one with a larger CIDR range (e.g., /20 instead of /24).
Why wrong: Incorrect. Subnet IP exhaustion causes an ENI allocation failure with a different error, not a 'Connection timed out' error. The issue is transient network connectivity, not insufficient IP addresses.
C
Add an inbound rule to the RDS security group allowing traffic on ports 1024-65535 from the Glue security group.
Why wrong: Incorrect. The existing security group rule allows inbound on port 5432, which is sufficient. Adding ephemeral ports is unnecessary for PostgreSQL.
D
Increase the number of retries in the Glue job configuration to 5.
Correct. The intermittent 'Connection timed out' error suggests transient network issues. Configuring retries allows the job to succeed on subsequent attempts after the network recovers.

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

✓

Increase the number of retries in the Glue job configuration to 5.

Option D is correct because the error 'Connection timed out' indicates intermittent network connectivity issues, not IP exhaustion. Increasing retries allows the job to succeed on retry after transient network failures resolve. Option B is incorrect because subnet IP exhaustion would cause an ENI allocation error, not a timeout. Option A is incorrect because timeout settings do not address connectivity. Option C is incorrect because the existing security group rule on port 5432 is sufficient; ephemeral ports are not needed for PostgreSQL.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

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

✗
Set the Glue job timeout to 60 minutes to ensure the job does not fail prematurely.
Why it's wrong here
Incorrect. Increasing the job timeout does not fix intermittent network connectivity; the job would still fail if a timeout occurs.
✗
Change the subnet of the Glue job to one with a larger CIDR range (e.g., /20 instead of /24).
Why it's wrong here
Incorrect. Subnet IP exhaustion causes an ENI allocation failure with a different error, not a 'Connection timed out' error. The issue is transient network connectivity, not insufficient IP addresses.
✗
Add an inbound rule to the RDS security group allowing traffic on ports 1024-65535 from the Glue security group.
Why it's wrong here
Incorrect. The existing security group rule allows inbound on port 5432, which is sufficient. Adding ephemeral ports is unnecessary for PostgreSQL.
✓
Increase the number of retries in the Glue job configuration to 5.
Why this is correct
Correct. The intermittent 'Connection timed out' error suggests transient network issues. Configuring retries allows the job to succeed on subsequent attempts after the network recovers.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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.

Visual reference

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DEA-C01 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this DEA-C01 question test?

Data Operations and Support — This question tests Data Operations and Support — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Increase the number of retries in the Glue job configuration to 5. — Option D is correct because the error 'Connection timed out' indicates intermittent network connectivity issues, not IP exhaustion. Increasing retries allows the job to succeed on retry after transient network failures resolve. Option B is incorrect because subnet IP exhaustion would cause an ENI allocation error, not a timeout. Option A is incorrect because timeout settings do not address connectivity. Option C is incorrect because the existing security group rule on port 5432 is sufficient; ephemeral ports are not needed for PostgreSQL.

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

Are there clue words in this question I should notice?

Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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