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Migration →mediumMultiple ChoiceObjective-mapped

PAS-C01 Migration Practice Question

This PAS-C01 practice question tests your understanding of migration. 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 retail company is migrating its SAP ERP system from on-premises to AWS. The system includes an SAP HANA database (2 TB) and an SAP NetWeaver application server. The migration strategy is to use SAP HANA System Replication (HSR) to replicate the database to an EC2 instance running SAP HANA, then perform a takeover. The application server will be migrated using AWS Application Migration Service (MGN). The network connection is AWS Direct Connect with 1 Gbps bandwidth. During a test migration, the HSR replication is working, but the application server replication through MGN is taking much longer than expected. The MGN console shows that the data replication progress is stuck at 45% for several hours. The source server is a physical server with a 500 GB disk, 75% utilized. Which action is most likely to resolve the issue?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
Increase the disk queue depth on the source server or add additional disks to improve I/O performance.
Increasing the disk queue depth (option A) can improve I/O performance and resolve the stall, as the MGN data replication process is stuck at 45% due to a source disk I/O bottleneck.
B
Convert the source disks to dynamic disks to improve replication speed.
Why wrong: Option B is incorrect because converting to dynamic disks does not address I/O throughput; MGN works with static disks.
C
Increase the staging area size in the MGN replication settings.
Why wrong: Option C is incorrect because increasing the staging area size would not help if the issue is I/O; the staging area is used for caching changes, but the problem is the source disk cannot read/write fast enough.
D
Increase the Direct Connect bandwidth to 10 Gbps.
Why wrong: Option D is incorrect because increasing Direct Connect bandwidth would not affect source I/O performance; the bottleneck is local to the source server.

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

✓

Increase the disk queue depth on the source server or add additional disks to improve I/O performance.

The MGN data replication process is stuck at 45%, indicating a source disk I/O bottleneck. This often occurs when the source server's disk queue depth is insufficient to keep up with the rate of change. Increasing the disk queue depth (option A) can improve I/O performance and resolve the stall. Option B is incorrect because converting to dynamic disks does not address I/O throughput; MGN works with static disks. Option C is incorrect because increasing the staging area size would not help if the issue is I/O; the staging area is used for caching changes, but the problem is the source disk cannot read/write fast enough. Option D is incorrect because increasing Direct Connect bandwidth would not affect source I/O performance; the bottleneck is local to the source server.

Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

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 disk queue depth on the source server or add additional disks to improve I/O performance.
Why this is correct
Increasing the disk queue depth (option A) can improve I/O performance and resolve the stall, as the MGN data replication process is stuck at 45% due to a source disk I/O bottleneck.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
✗
Convert the source disks to dynamic disks to improve replication speed.
Why it's wrong here
Option B is incorrect because converting to dynamic disks does not address I/O throughput; MGN works with static disks.
✗
Increase the staging area size in the MGN replication settings.
Why it's wrong here
Option C is incorrect because increasing the staging area size would not help if the issue is I/O; the staging area is used for caching changes, but the problem is the source disk cannot read/write fast enough.
✗
Increase the Direct Connect bandwidth to 10 Gbps.
Why it's wrong here
Option D is incorrect because increasing Direct Connect bandwidth would not affect source I/O performance; the bottleneck is local to the source server.

Common exam traps

Common exam trap: OSPF can fail even when IP connectivity looks correct

OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.

Detailed technical explanation

How to think about this question

OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.

KKey Concepts to Remember

OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.

TExam Day Tips

Check area mismatch first when OSPF adjacency fails.
Review passive interfaces when a network is advertised but no neighbour forms.
Use show ip ospf neighbor and show ip route clues carefully.

Key takeaway

OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related PAS-C01 OSPF questions on adjacency and route selection.

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FAQ

Questions learners often ask

What does this PAS-C01 question test?

Migration — This question tests Migration — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: Increase the disk queue depth on the source server or add additional disks to improve I/O performance. — The MGN data replication process is stuck at 45%, indicating a source disk I/O bottleneck. This often occurs when the source server's disk queue depth is insufficient to keep up with the rate of change. Increasing the disk queue depth (option A) can improve I/O performance and resolve the stall. Option B is incorrect because converting to dynamic disks does not address I/O throughput; MGN works with static disks. Option C is incorrect because increasing the staging area size would not help if the issue is I/O; the staging area is used for caching changes, but the problem is the source disk cannot read/write fast enough. Option D is incorrect because increasing Direct Connect bandwidth would not affect source I/O performance; the bottleneck is local to the source server.

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

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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