- A
VPC peering for private IP
If the source uses private IP, use VPC peering to connect.
- B
No public endpoint
Why wrong: Not a standard method for DMS.
- C
IP allowlisting for public IP
If the source has a public IP, allowlist the DMS IP ranges.
- D
Cloud SQL Auth Proxy
Why wrong: Auth Proxy is used to connect to Cloud SQL, not to the source database.
- E
Cloud VPN
Why wrong: Cloud VPN can connect on-premises to GCP, but DMS connection profile uses IP allowlist or peering directly.
Question 122 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 is using Database Migration Service to migrate a MySQL database to Cloud SQL. They need to set up a source connection profile. Which TWO methods can the engineer use to allow DMS to connect to the source database? (Choose 2 correct answers.)
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
✓
VPC peering for private IP
Option A is correct because VPC peering allows DMS to connect to a source database using private IP addresses without traversing the public internet, which is a secure and recommended method for connectivity within Google Cloud. This method establishes a direct, low-latency connection between the DMS service's VPC and the source database's VPC, provided the IP ranges do not overlap. It is particularly suitable when the source database is hosted in a different VPC or on-premises via a VPN-connected VPC.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VPC peering for private IP
Why this is correct
If the source uses private IP, use VPC peering to connect.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
No public endpoint
Why it's wrong here
Not a standard method for DMS.
- ✓
IP allowlisting for public IP
Why this is correct
If the source has a public IP, allowlist the DMS IP ranges.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud SQL Auth Proxy
Why it's wrong here
Auth Proxy is used to connect to Cloud SQL, not to the source database.
- ✗
Cloud VPN
Why it's wrong here
Cloud VPN can connect on-premises to GCP, but DMS connection profile uses IP allowlist or peering directly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud DMS supports two direct connection methods for source connection profiles: VPC peering (private IP) and IP allowlisting (public IP). Candidates may mistakenly select Cloud VPN or Cloud SQL Auth Proxy, which are supporting infrastructure or unrelated services, not valid profile methods.
Detailed technical explanation
How to think about this question
DMS source connection profiles support two primary connectivity methods: VPC peering (for private IP sources) and IP allowlisting (for public IP sources). When using VPC peering, DMS automatically creates a peering connection between the service's VPC and the customer's VPC, enabling private communication without public exposure. IP allowlisting requires the source database to have a public IP and a firewall rule that permits inbound traffic from DMS's public IP range, which is documented in Google Cloud's official DMS documentation.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this PCDOE question test?
Migrate Database Solutions — This question tests Migrate Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: VPC peering for private IP — Option A is correct because VPC peering allows DMS to connect to a source database using private IP addresses without traversing the public internet, which is a secure and recommended method for connectivity within Google Cloud. This method establishes a direct, low-latency connection between the DMS service's VPC and the source database's VPC, provided the IP ranges do not overlap. It is particularly suitable when the source database is hosted in a different VPC or on-premises via a VPN-connected VPC.
What should I do if I get this PCDOE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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