The answer is that the backup file is not placed in the correct S3 bucket path that includes the account ID prefix. When performing an RDS native restore from S3, the service expects the backup file to be stored under a specific key prefix that begins with your AWS account ID followed by a hyphen, such as '123456789012/backup.bak'. If the file is uploaded directly to the bucket root or a different folder, RDS cannot locate it, triggering the 'Could not find backup file' error even though the file exists and IAM permissions are correct. This scenario is a common trap on the AWS Certified Database Specialty DBS-C01 exam, testing your understanding of the strict path requirements for native SQL Server restores. Many candidates mistakenly focus on encryption or file extensions, but the exam emphasizes that the account ID prefix is mandatory. Memory tip: think of the S3 path as a mailing address—without the account ID "zip code" at the start, RDS cannot deliver the backup to your instance.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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 is migrating a 1 TB Microsoft SQL Server database to Amazon RDS for SQL Server using native backup and restore. The DBA has taken a full backup of the source database and uploaded it to an S3 bucket. The DBA then uses the 'aws rds restore-db-instance-from-db-snapshot' CLI command to restore the backup to an RDS instance. The restore fails with an error: 'Could not find the specified backup file in the S3 bucket.' The DBA verifies that the backup file exists in the correct S3 bucket and that the IAM role used by RDS has permissions to access the bucket. What is the most likely cause of the failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The backup file is not placed in the correct S3 bucket path that includes the account ID prefix.
Option C is correct. The backup file must be stored with a specific key prefix that includes the AWS account ID and the hyphen, e.g., '123456789012/mybackup.bak'. The error 'Could not find the specified backup file' often occurs when the file is not in the expected path. Option A is wrong because the backup file does not need to be encrypted; native restore can handle unencrypted backups. Option B is wrong because RDS supports native restore from S3; the error is not about unsupported features. Option D is wrong because the backup file extension does not matter; RDS accepts both .bak and .trn files.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 backup file has an incorrect file extension, such as .trn instead of .bak.
Why it's wrong here
RDS supports both .bak and .trn extensions for native restore.
✗
The backup file is not encrypted with AWS KMS.
Why it's wrong here
Native restore does not require encryption; it can restore unencrypted backups.
✗
The RDS instance is not configured to use native restore.
Why it's wrong here
RDS supports native restore from S3 by default.
✓
The backup file is not placed in the correct S3 bucket path that includes the account ID prefix.
Why this is correct
RDS expects the backup file to be in a path like 'bucket-name/account-id/filename'. If missing, it cannot find the file.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Deployment and Migration — This question tests Deployment and Migration — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The backup file is not placed in the correct S3 bucket path that includes the account ID prefix. — Option C is correct. The backup file must be stored with a specific key prefix that includes the AWS account ID and the hyphen, e.g., '123456789012/mybackup.bak'. The error 'Could not find the specified backup file' often occurs when the file is not in the expected path. Option A is wrong because the backup file does not need to be encrypted; native restore can handle unencrypted backups. Option B is wrong because RDS supports native restore from S3; the error is not about unsupported features. Option D is wrong because the backup file extension does not matter; RDS accepts both .bak and .trn files.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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