- A
Modify the Redshift security group to allow inbound traffic on port 5439 from the Glue subnet.
Why wrong: Network access, not encryption.
- B
Update the JDBC connection string to include ssl=true and sslmode=require.
Ensures the JDBC driver uses SSL encryption.
- C
Enable server-side encryption on the S3 bucket using AWS KMS.
Why wrong: For data at rest in S3, not in transit.
- D
Set the Redshift cluster parameter group to require_ssl=ON.
Why wrong: This forces SSL on Redshift server side; but the JDBC driver may still not use SSL without the URL parameter.
Question 238 of 1,786
Configuring TLS for AWS Glue to Redshift JDBC Connection
This DEA-C01 practice question tests your understanding of data security and governance. 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 data from an S3 data lake and load it into an Amazon Redshift cluster. The security policy mandates that all data in transit between AWS Glue and Redshift must be encrypted using TLS. The team uses a JDBC connection. Currently, the connection is failing with an SSL-related error. Which configuration change should the team make to ensure encrypted connectivity?
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
✓
Update the JDBC connection string to include ssl=true and sslmode=require.
To enforce TLS encryption for JDBC connections to Amazon Redshift, the connection string must include ssl=true and often sslmode=require. This is a client-side configuration that tells the JDBC driver to use SSL. Option A is incorrect because security groups control network access, not encryption. Option C is incorrect because server-side encryption on S3 secures data at rest, not data in transit. Option D is incorrect because setting require_ssl=ON in the cluster parameter group enforces SSL on the server side, but the client (Glue) must still specify ssl=true in the JDBC URL to establish an encrypted connection. Therefore, the correct change is option B.
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.
- ✗
Modify the Redshift security group to allow inbound traffic on port 5439 from the Glue subnet.
Why it's wrong here
Network access, not encryption.
- ✓
Update the JDBC connection string to include ssl=true and sslmode=require.
- ✗
Enable server-side encryption on the S3 bucket using AWS KMS.
Why it's wrong here
For data at rest in S3, not in transit.
- ✗
Set the Redshift cluster parameter group to require_ssl=ON.
Why it's wrong here
This forces SSL on Redshift server side; but the JDBC driver may still not use SSL without the URL parameter.
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.
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 Security and Governance — This question tests Data Security and Governance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Update the JDBC connection string to include ssl=true and sslmode=require. — To enforce TLS encryption for JDBC connections to Amazon Redshift, the connection string must include ssl=true and often sslmode=require. This is a client-side configuration that tells the JDBC driver to use SSL. Option A is incorrect because security groups control network access, not encryption. Option C is incorrect because server-side encryption on S3 secures data at rest, not data in transit. Option D is incorrect because setting require_ssl=ON in the cluster parameter group enforces SSL on the server side, but the client (Glue) must still specify ssl=true in the JDBC URL to establish an encrypted connection. Therefore, the correct change is option B.
What should I do if I get this DEA-C01 question wrong?
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.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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