- A
Create a new Redis cluster with encryption in transit enabled, and migrate the data from the existing cluster.
Encryption in transit can only be enabled at cluster creation time.
- B
Update the Redis parameter group to enable the 'encryption-in-transit' parameter and reboot the cluster.
Why wrong: There is no such parameter; encryption in transit is a cluster-level setting.
- C
Use a security group to enforce encrypted connections by allowing only TLS traffic.
Why wrong: Security groups cannot enforce encryption; they only filter traffic by IP and port.
- D
Modify the existing Redis cluster to enable encryption in transit using the AWS CLI.
Why wrong: Encryption in transit cannot be modified on an existing cluster.
- E
Enable encryption in transit on the existing cluster by using the AWS Management Console.
Why wrong: The console does not allow enabling encryption in transit on an existing cluster.
Quick Answer
The correct action is to create a new Redis cluster with encryption in transit enabled and migrate the data from the existing cluster. This is required because encryption in transit for ElastiCache Redis is a cluster-level setting that can only be enabled at creation time; it cannot be applied retroactively to an existing cluster. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding of immutable security configurations and the necessity of rebuilding resources to enforce them. A common trap is assuming you can modify the existing cluster’s parameter group or security settings to add encryption, but AWS enforces this restriction to ensure the TLS handshake is established from the start. To minimize downtime, plan a blue/green deployment or use replication to migrate session data before switching traffic. Memory tip: “Encryption in transit? Build it from the start—you can’t add it to a cart that’s already full.”
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. 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 uses Amazon ElastiCache for Redis to cache session data. The security team requires that all data in transit be encrypted. The Redis cluster currently does not have encryption in transit enabled. The database specialist needs to enable encryption in transit with minimal downtime. Which action should the specialist take?
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
Create a new Redis cluster with encryption in transit enabled, and migrate the data from the existing cluster.
Encryption in transit for ElastiCache for Redis can only be enabled at cluster creation time; it cannot be added to an existing cluster. Therefore, the correct approach is to create a new Redis cluster with encryption in transit enabled, migrate the session data from the existing cluster (e.g., using replication or a manual export/import), and then redirect application traffic to the new cluster. This ensures minimal downtime if the migration is performed during a maintenance window or using a blue/green deployment strategy.
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.
- ✓
Create a new Redis cluster with encryption in transit enabled, and migrate the data from the existing cluster.
Why this is correct
Encryption in transit can only be enabled at cluster creation time.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Update the Redis parameter group to enable the 'encryption-in-transit' parameter and reboot the cluster.
Why it's wrong here
There is no such parameter; encryption in transit is a cluster-level setting.
- ✗
Use a security group to enforce encrypted connections by allowing only TLS traffic.
Why it's wrong here
Security groups cannot enforce encryption; they only filter traffic by IP and port.
- ✗
Modify the existing Redis cluster to enable encryption in transit using the AWS CLI.
Why it's wrong here
Encryption in transit cannot be modified on an existing cluster.
- ✗
Enable encryption in transit on the existing cluster by using the AWS Management Console.
Why it's wrong here
The console does not allow enabling encryption in transit on an existing cluster.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume encryption in transit can be toggled on an existing cluster, similar to enabling encryption at rest, but AWS enforces it as a creation-time-only setting for ElastiCache for Redis.
Detailed technical explanation
How to think about this question
ElastiCache for Redis encryption in transit uses TLS 1.2 to encrypt data between clients and the cluster, and it requires the cluster to be created with the TransitEncryptionEnabled parameter set to true. Under the hood, this enables TLS on the Redis port (default 6379) and requires clients to connect using a TLS-enabled Redis client (e.g., redis-cli with --tls). A common real-world scenario is migrating session data by setting up a replication group with the new cluster as a read replica, then promoting it, which can reduce downtime to seconds.
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.
TExam Day Tips
- 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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Database Security — This question tests Database Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a new Redis cluster with encryption in transit enabled, and migrate the data from the existing cluster. — Encryption in transit for ElastiCache for Redis can only be enabled at cluster creation time; it cannot be added to an existing cluster. Therefore, the correct approach is to create a new Redis cluster with encryption in transit enabled, migrate the session data from the existing cluster (e.g., using replication or a manual export/import), and then redirect application traffic to the new cluster. This ensures minimal downtime if the migration is performed during a maintenance window or using a blue/green deployment strategy.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This DBS-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 DBS-C01 exam.
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