- A
Set up a Compute Engine VM as a proxy and whitelist its static IP in the source firewall.
This allows DMS to connect via the proxy with a known IP.
- B
Create a continuous migration job in Database Migration Service.
Continuous migration enables CDC and minimal downtime cutover.
- C
Use Cloud SQL Auth Proxy to connect DMS to the source database.
Why wrong: Cloud SQL Auth Proxy is for clients connecting to Cloud SQL, not for DMS source connectivity.
- D
Expose the source database on a public IP with SSL.
Why wrong: Exposing on public IP may violate security policies; the question says behind firewall.
- E
Configure Database Migration Service to use a one-time migration job.
Why wrong: One-time migration causes downtime; you need continuous for minimal downtime.
Question 943 of 980
PCD Migrate Data Solutions Practice Question
This PCD practice question tests your understanding of migrate data 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.
Your company is migrating a 2 TB Oracle database to Cloud SQL for PostgreSQL using Database Migration Service (DMS). The source database is behind a firewall and only allows connections from specific IP ranges. The migration must have minimal downtime. Which TWO actions should you take? (Choose 2 options.)
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
✓
Set up a Compute Engine VM as a proxy and whitelist its static IP in the source firewall.
For minimal downtime, continuous migration is needed. To connect to the source behind a firewall, you need either VPC peering with a VPN or a Compute Engine forwarding proxy with a whitelisted IP. Cloud SQL Auth Proxy is for connecting to Cloud SQL, not for source connectivity. A one-time migration would cause downtime.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set up a Compute Engine VM as a proxy and whitelist its static IP in the source firewall.
Why this is correct
This allows DMS to connect via the proxy with a known IP.
Related concept
Standard ACLs match source addresses.
- ✓
Create a continuous migration job in Database Migration Service.
Why this is correct
Continuous migration enables CDC and minimal downtime cutover.
Related concept
Standard ACLs match source addresses.
- ✗
Use Cloud SQL Auth Proxy to connect DMS to the source database.
Why it's wrong here
Cloud SQL Auth Proxy is for clients connecting to Cloud SQL, not for DMS source connectivity.
- ✗
Expose the source database on a public IP with SSL.
Why it's wrong here
Exposing on public IP may violate security policies; the question says behind firewall.
- ✗
Configure Database Migration Service to use a one-time migration job.
Why it's wrong here
One-time migration causes downtime; you need continuous for minimal downtime.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCD ACL questions on filtering logic and placement.
- →
Migrate Data Solutions — study guide chapter
Learn the concepts, then practise the questions
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Migrate Data Solutions practice questions
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FAQ
Questions learners often ask
What does this PCD question test?
Migrate Data Solutions — This question tests Migrate Data Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Set up a Compute Engine VM as a proxy and whitelist its static IP in the source firewall. — For minimal downtime, continuous migration is needed. To connect to the source behind a firewall, you need either VPC peering with a VPN or a Compute Engine forwarding proxy with a whitelisted IP. Cloud SQL Auth Proxy is for connecting to Cloud SQL, not for source connectivity. A one-time migration would cause downtime.
What should I do if I get this PCD question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCD ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jul 4, 2026
This PCD 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 PCD exam.
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