Question 1,295 of 1,663
DBS-C01 Workload-Specific Database Design Practice Question
Network Topology
A developer runs the command `aws rds describe-db-instances --db-instance-identifier mydb` and gets the output containing `Source_Region: us-east-1` and `Replica_Mode: async`. Which conclusion can be drawn about the database configuration?
⚠ Common exam trap
Many exam-takers confuse Multi-AZ standby instances with read replicas, but Multi-AZ uses synchronous replication and does not expose `Source_Region` or `Replica_Mode`, whereas read replicas use asynchronous replication and always show these fields.
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
✓
The database is a read replica of another instance
The output from the describe-db-instances command indicates that this database is configured as a read replica. Read replicas in Amazon RDS are identified by the presence of a source region and asynchronous replication mode, which are characteristic of read replica configurations. Multi-AZ deployments use synchronous replication and do not expose these fields, making option D the only viable conclusion.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The database is a Multi-AZ read replica
Why it's wrong here
Multi-AZ is for high availability, not read replicas.
- ✗
The database engine is Aurora MySQL
Why it's wrong here
Engine is mysql, not aurora-mysql.
- ✗
The database is a primary instance in a Multi-AZ deployment
Why it's wrong here
It is a read replica, not primary.
- ✓
The database is a read replica of another instance
Why this is correct
ReadReplicaSourceDBInstanceIdentifier indicates it is a replica.
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Last reviewed: Jul 4, 2026
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