DBS-C01 Database Security Practice Question
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?
⚠ Common exam trap
Candidates often 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.
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.
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.
- ✗
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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