The answer is to use AWS DMS with compression enabled. This is correct because DMS compression reduces the volume of data transferred over the network, which is critical when migrating a 1 TB SQL Server database with large LOB columns across a limited 50 Mbps link; without compression, the raw transfer would exceed the one-week window, but compression can shrink the LOB data significantly, making the timeline feasible. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of how DMS handles bandwidth constraints and large object columns, often appearing as a trap where candidates mistakenly choose native backup or BCP, which require full data transfer and would fail under slow networks. A key memory tip: when bandwidth is tight and LOBs are large, think “compress to impress”—DMS compression is your go-to for beating the clock.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 SQL Server database from on-premises to Amazon RDS for SQL Server. The database has a large table with a LOB column. The network bandwidth between the on-premises data center and AWS is limited to 50 Mbps. The migration must be completed within a week. Which approach should the company use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS DMS with compression enabled.
Option D is correct because AWS DMS can compress data during transfer, reducing the amount of data sent over the network, and can complete within a week even with a 50 Mbps connection. Option A is wrong because SQL Server native backup and restore requires the backup file to be transferred over the network, which may take too long with 50 Mbps. Option B is wrong because BCP export/import also transfers the entire data over the network. Option C is wrong because creating a read replica is not possible from on-premises.
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.
✗
Use BCP to export the LOB table to flat files and then import to RDS.
Why it's wrong here
Data transfer over 50 Mbps may be too slow.
✗
Use SQL Server native backup and restore to RDS.
Why it's wrong here
Backup file transfer over 50 Mbps may exceed the time window.
✓
Use AWS DMS with compression enabled.
Why this is correct
DMS supports compression to reduce data transfer time.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create a read replica of the on-premises database and promote it.
Why it's wrong here
Read replicas are not supported for on-premises databases.
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 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.
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: Use AWS DMS with compression enabled. — Option D is correct because AWS DMS can compress data during transfer, reducing the amount of data sent over the network, and can complete within a week even with a 50 Mbps connection. Option A is wrong because SQL Server native backup and restore requires the backup file to be transferred over the network, which may take too long with 50 Mbps. Option B is wrong because BCP export/import also transfers the entire data over the network. Option C is wrong because creating a read replica is not possible from on-premises.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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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.
Question Discussion
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