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Migration →hardMultiple ChoiceObjective-mapped

PAS-C01 Migration Practice Question

This PAS-C01 practice question tests your understanding of migration. 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.

A company is migrating their SAP CRM system to AWS. They are using AWS DMS to migrate the database from Oracle to Amazon RDS for Oracle. The database size is 1 TB. They have a 1 Gbps network link. They plan to use full load and CDC. During the full load, they notice that the DMS task is running but the progress is very slow. They check CloudWatch metrics and see that the DMS replication instance CPU is at 90% and the write IOPS on the target RDS instance is 5000. The target RDS instance is a db.r5.large (2 vCPU, 16 GB RAM). What should they do to improve the full load performance?

A
Increase the DMS replication instance size
Why wrong: Increasing the DMS replication instance size is not the right fix because the CPU on the DMS instance is high, but the bottleneck is the target RDS instance's write IOPS. A larger DMS instance would not improve write throughput if the target is the limiting factor.
B
Upgrade the target RDS instance to a larger size with higher IOPS
The target RDS instance (db.r5.large) has only 5000 write IOPS, which is insufficient for the full load. Upgrading to a larger instance with higher IOPS will increase write throughput and improve performance.
C
Disable the DMS task logging to reduce overhead
Why wrong: Disabling DMS task logging would not reduce CPU overhead significantly and could lead to data loss during CDC. It is not a recommended solution.
D
Increase the size of the source Oracle instance
Why wrong: Increasing the size of the source Oracle instance would not help because the bottleneck is on the target side, not the source. DMS is reading from the source, but the write performance to the target is the issue.

Full breakdown with real-world context →

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

✓

Upgrade the target RDS instance to a larger size with higher IOPS

The target RDS instance (db.r5.large) is undersized for the required write throughput, as indicated by the 5000 write IOPS and high DMS replication instance CPU (likely waiting on target writes). Upgrading to a larger instance with higher IOPS (e.g., db.r5.xlarge with provisioned IOPS) will increase write capacity and improve full load performance. Option A is not the best choice because the DMS replication instance is already near 100% CPU, but the bottleneck is likely the target, so increasing the replication instance alone may not help. Option C would reduce overhead but at the cost of losing logging information and is not recommended. Option D is irrelevant as the source is on-premises and not a bottleneck.

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.

✗
Increase the DMS replication instance size
Why it's wrong here
Increasing the DMS replication instance size is not the right fix because the CPU on the DMS instance is high, but the bottleneck is the target RDS instance's write IOPS. A larger DMS instance would not improve write throughput if the target is the limiting factor.
✓
Upgrade the target RDS instance to a larger size with higher IOPS
Why this is correct
The target RDS instance (db.r5.large) has only 5000 write IOPS, which is insufficient for the full load. Upgrading to a larger instance with higher IOPS will increase write throughput and improve performance.
Related concept
Standard ACLs match source addresses.
✗
Disable the DMS task logging to reduce overhead
Why it's wrong here
Disabling DMS task logging would not reduce CPU overhead significantly and could lead to data loss during CDC. It is not a recommended solution.
✗
Increase the size of the source Oracle instance
Why it's wrong here
Increasing the size of the source Oracle instance would not help because the bottleneck is on the target side, not the source. DMS is reading from the source, but the write performance to the target is the issue.

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

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.

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 PAS-C01 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this PAS-C01 question test?

Migration — This question tests Migration — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Upgrade the target RDS instance to a larger size with higher IOPS — The target RDS instance (db.r5.large) is undersized for the required write throughput, as indicated by the 5000 write IOPS and high DMS replication instance CPU (likely waiting on target writes). Upgrading to a larger instance with higher IOPS (e.g., db.r5.xlarge with provisioned IOPS) will increase write capacity and improve full load performance. Option A is not the best choice because the DMS replication instance is already near 100% CPU, but the bottleneck is likely the target, so increasing the replication instance alone may not help. Option C would reduce overhead but at the cost of losing logging information and is not recommended. Option D is irrelevant as the source is on-premises and not a bottleneck.

What should I do if I get this PAS-C01 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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This PAS-C01 practice question is part of Courseiva's free Amazon Web Services 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 PAS-C01 exam.