- A
Configure a VPN or Dedicated Interconnect with VPC
This provides secure private connectivity from on-premises to GCP.
- B
VPC peering
Why wrong: VPC peering connects VPCs, but on-premises requires VPN or Interconnect.
- C
Cloud SQL Auth Proxy
Why wrong: Auth Proxy is for connecting to Cloud SQL, not for source connectivity.
- D
IP allowlisting
Why wrong: Requires a public IP, which is not desired.
Question 621 of 1,000
PCDOE Migrate Database Solutions Practice Question
This PCDOE practice question tests your understanding of migrate database solutions. 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 team is migrating an on-premises Oracle database to Cloud SQL for PostgreSQL using DMS. They have completed the schema conversion using Ora2Pg and are now setting up continuous migration. The source database is behind a firewall. Which connectivity method should they use for the source connection profile if they cannot use public IP?
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
✓
Configure a VPN or Dedicated Interconnect with VPC
Since the source Oracle database is behind a firewall and cannot use a public IP, a VPN or Dedicated Interconnect with VPC provides a private, encrypted connection between the on-premises network and Google Cloud. This allows Database Migration Service (DMS) to reach the source database securely without exposing it to the public internet. DMS supports connectivity via these private network paths when public IP is not an option.
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.
- ✓
Configure a VPN or Dedicated Interconnect with VPC
Why this is correct
This provides secure private connectivity from on-premises to GCP.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
VPC peering
Why it's wrong here
VPC peering connects VPCs, but on-premises requires VPN or Interconnect.
- ✗
Cloud SQL Auth Proxy
Why it's wrong here
Auth Proxy is for connecting to Cloud SQL, not for source connectivity.
- ✗
IP allowlisting
Why it's wrong here
Requires a public IP, which is not desired.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between VPC peering (which only works between Google Cloud VPCs) and hybrid connectivity options like VPN or Interconnect (which connect on-premises to Google Cloud), leading candidates to mistakenly choose VPC peering for on-premises scenarios.
Detailed technical explanation
How to think about this question
DMS uses a migration job that connects to the source database via a connectivity profile. When using private connectivity, DMS leverages VPC peering or a VPN/Interconnect to route traffic through a private IP address. The VPN or Dedicated Interconnect establishes an encrypted tunnel (IPsec for VPN, or MPLS for Interconnect) that bypasses the public internet, ensuring low-latency and secure data transfer for continuous migration (CDC).
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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Migrate Database Solutions — study guide chapter
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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: Configure a VPN or Dedicated Interconnect with VPC — Since the source Oracle database is behind a firewall and cannot use a public IP, a VPN or Dedicated Interconnect with VPC provides a private, encrypted connection between the on-premises network and Google Cloud. This allows Database Migration Service (DMS) to reach the source database securely without exposing it to the public internet. DMS supports connectivity via these private network paths when public IP is not an option.
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.
About these practice questions
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Last reviewed: Jul 4, 2026
This PCDOE practice question is part of Courseiva's free Google Cloud 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 PCDOE exam.
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