- A
Configure private VPC peering between Redshift and BigQuery.
Why wrong: Not possible; Redshift is in AWS.
- B
Use Amazon S3 as intermediate staging for unloaded data.
Redshift unloads to S3, then transfer service loads from S3 to GCS/BigQuery.
- C
Encrypt data in transit using SSL/TLS.
Ensures data is encrypted during transfer between services.
- D
Set up automatic refresh schedule for incremental data loads.
Data Transfer Service supports scheduled refreshes.
- E
Enable Cloud NAT for the transfer service to access Redshift.
Why wrong: Data Transfer Service pulls from S3, not directly from Redshift; NAT not needed.
Question 668 of 980
PCD Migrate Data Solutions Practice Question
This PCD practice question tests your understanding of migrate data solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 a Redshift data warehouse to BigQuery using BigQuery Data Transfer Service. They need to ensure the transfer is secure and cost-effective. Which THREE considerations are important?
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 Amazon S3 as intermediate staging for unloaded data.
Intermediate staging in S3, encrypting data in transit, and enabling automatic refresh are typical considerations for Redshift to BigQuery transfers using Data Transfer Service.
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.
- ✗
Configure private VPC peering between Redshift and BigQuery.
Why it's wrong here
Not possible; Redshift is in AWS.
- ✓
Use Amazon S3 as intermediate staging for unloaded data.
Why this is correct
Redshift unloads to S3, then transfer service loads from S3 to GCS/BigQuery.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Encrypt data in transit using SSL/TLS.
Why this is correct
Ensures data is encrypted during transfer between services.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Set up automatic refresh schedule for incremental data loads.
Why this is correct
Data Transfer Service supports scheduled refreshes.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Enable Cloud NAT for the transfer service to access Redshift.
Why it's wrong here
Data Transfer Service pulls from S3, not directly from Redshift; NAT not needed.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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 PCD NAT questions on configuration and troubleshooting.
- →
Migrate Data Solutions — study guide chapter
Learn the concepts, then practise the 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 — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use Amazon S3 as intermediate staging for unloaded data. — Intermediate staging in S3, encrypting data in transit, and enabling automatic refresh are typical considerations for Redshift to BigQuery transfers using Data Transfer Service.
What should I do if I get this PCD 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 PCD 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
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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