- A
Use a Cloud VPN tunnel with static IP
Why wrong: Overkill; VPN can be used but peering or proxy is simpler and recommended.
- B
Use Cloud NAT to provide outbound connectivity
Why wrong: Cloud NAT enables outbound, not inbound connectivity to source.
- C
Use VPC peering or Cloud SQL Auth Proxy
VPC peering enables private connectivity; Cloud SQL Auth Proxy provides secure tunnel.
- D
Use the source database's public IP with IP allowlisting
Why wrong: The source has only private IP, so public IP is not available.
Question 76 of 1,000
PCDOE Migrate Database Solutions Practice Question
This PCDOE practice question tests your understanding of migrate database solutions. 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.
An engineer needs to connect Database Migration Service to a source MySQL database that has only a private IP address. The Cloud SQL destination is also private. What is the recommended method for DMS to connect to the source?
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
✓
Use VPC peering or Cloud SQL Auth Proxy
For private IP sources, VPC peering or Cloud SQL Auth Proxy can be used. Auth Proxy is recommended for secure connectivity without public IP exposure.
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 a Cloud VPN tunnel with static IP
Why it's wrong here
Overkill; VPN can be used but peering or proxy is simpler and recommended.
- ✗
Use Cloud NAT to provide outbound connectivity
Why it's wrong here
Cloud NAT enables outbound, not inbound connectivity to source.
- ✓
Use VPC peering or Cloud SQL Auth Proxy
Why this is correct
VPC peering enables private connectivity; Cloud SQL Auth Proxy provides secure tunnel.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Use the source database's public IP with IP allowlisting
Why it's wrong here
The source has only private IP, so public IP is not available.
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 PCDOE NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this PCDOE question test?
Migrate Database Solutions — This question tests Migrate Database Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use VPC peering or Cloud SQL Auth Proxy — For private IP sources, VPC peering or Cloud SQL Auth Proxy can be used. Auth Proxy is recommended for secure connectivity without public IP exposure.
What should I do if I get this PCDOE 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 PCDOE 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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Last reviewed: Jul 4, 2026
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