PAS-C01 Migration Practice Test 19 — 15 Questions

Question 1

A company is migrating a legacy .NET application to AWS. The application uses Windows Authentication and relies on Active Directory for user authentication. The company wants to minimize changes to the application code. Which AWS service should be used to integrate Active Directory with the migrated application?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

AWS Directory Service for Microsoft Active Directory. AWS Directory Service for Microsoft Active Directory is the correct choice because it provides a fully managed Microsoft Active Directory in the AWS cloud, which natively supports Windows Authentication and Kerberos-based authentication without requiring any code changes. This service allows the migrated .NET application to seamlessly integrate with the existing on-premises Active Directory through a trust relationship or by extending the directory directly into AWS, preserving the application's authentication logic.

Answer

Amazon Cognito

Answer

AD Connector

Answer

Simple AD

Question 2

A company is migrating a web application from an on-premises data center to AWS. The application uses a MySQL database that is 500 GB in size. The company wants to minimize downtime during the migration. Which approach should the company use?

Accepted Answer

Use AWS Database Migration Service (DMS) with ongoing replication. AWS Database Migration Service (DMS) with ongoing replication (change data capture, CDC) allows you to perform a live migration with minimal downtime. You can start a full load of the 500 GB MySQL database while the source remains operational, then enable CDC to replicate ongoing changes until you cut over to the target RDS instance, reducing the downtime window to seconds.

Answer

Use an RDS read replica and promote it

Answer

Stop the database, take a mysqldump, and restore to RDS

Answer

Use AWS Schema Conversion Tool (SCT) to migrate the schema and data

Question 3

A company is migrating a multi-tier application to AWS. The application includes a load balancer, web servers, and an Oracle database. The migration plan includes using AWS DMS for the database. During the initial full load, the DMS task fails with an error indicating insufficient memory. The source database is on an EC2 instance with 4 GB RAM. What should the migration team do to resolve this issue?

Accepted Answer

Increase the size of the DMS replication instance. The error 'insufficient memory' during the initial full load in AWS DMS typically indicates that the replication instance does not have enough memory to handle the data volume or LOB processing. Increasing the size of the DMS replication instance provides more memory for caching, transformation, and LOB handling, directly resolving the resource constraint without altering the source database or task structure.

Answer

Disable LOB support in the DMS task

Answer

Split the migration into multiple smaller tasks

Answer

Increase the memory of the source EC2 instance

Question 4

A company is migrating a 10 TB SQL Server database to Amazon RDS for SQL Server using AWS DMS. The migration is taking longer than expected. Which TWO actions can improve the migration speed? (Choose two.)

Accepted Answer

Enable parallel loading by splitting tables into multiple tasks. Splitting tables into multiple DMS tasks enables parallel loading, which significantly reduces migration time by processing multiple tables concurrently. Option D is correct because increasing the DMS replication instance size provides more CPU and memory resources, allowing the instance to handle larger data volumes and higher throughput more efficiently.

Answer

Use a single DMS task with full LOB mode

Answer

Use S3 multipart upload for the data

Answer

Disable transaction logging on the source

Question 5

A company is migrating a legacy on-premises application to AWS. The application uses a proprietary database that is not supported by AWS Database Migration Service (DMS). The company needs to minimize downtime and automate the migration as much as possible. Which approach should be used?

Accepted Answer

Use AWS Application Migration Service (MGN) to replicate the entire server, including the database, to AWS.. AWS Application Migration Service (MGN) can replicate entire servers, including the operating system, applications, and the proprietary database, to AWS without requiring database-specific support. This minimizes downtime by using continuous block-level replication and automates the migration by converting the source server into a native AWS instance. Since AWS DMS does not support the proprietary database, MGN provides a viable path for migrating the entire workload as a whole.

Answer

Use AWS Database Migration Service (DMS) with a custom endpoint.

Answer

Export the database as a flat file, upload to Amazon S3, and import into Amazon RDS.

Answer

Use AWS Snowball to transfer database backups, then restore in Amazon RDS.

Question 6

An organization is migrating a large data lake (500 TB) from on-premises HDFS to Amazon S3. The migration must be completed within 3 weeks. The network bandwidth between on-premises and AWS is 1 Gbps. What is the MOST efficient migration approach?

Accepted Answer

Use multiple AWS Snowball Edge devices to transfer the data in parallel.. Given the 500 TB data volume and a 3-week deadline, the 1 Gbps network bandwidth yields a theoretical maximum transfer of only ~340 TB in 3 weeks (1 Gbps * 21 days * 86400 seconds / 8 bits per byte), which is insufficient. AWS Snowball Edge devices provide a petabyte-scale, offline data transfer solution that bypasses network constraints entirely, allowing parallel transfers to meet the timeline. This is the most efficient approach because it avoids network bottlenecks and leverages physical shipping for massive datasets.

Answer

Use AWS DataSync over the existing internet connection.

Answer

Order a dedicated AWS Direct Connect circuit at 10 Gbps and use AWS DataSync.

Answer

Use Amazon S3 Transfer Acceleration to speed up the transfer over the internet.

Question 7

A company is migrating a multi-tier application to AWS and wants to ensure high availability. The application has a web tier, application tier, and database tier. The database is currently running on a single on-premises server. Which migration strategy minimizes downtime and provides the HIGHEST availability for the database tier?

Accepted Answer

Use AWS DMS to migrate the database to Amazon RDS Multi-AZ deployment.. AWS DMS can perform a live migration with minimal downtime by continuously replicating changes from the source database to the target Amazon RDS Multi-AZ deployment. Multi-AZ provides automatic failover to a standby replica in a different Availability Zone, ensuring the highest availability for the database tier. This combination minimizes downtime during migration and provides built-in high availability post-migration.

Answer

Use AWS Database Migration Service (DMS) to migrate to Amazon RDS in a single-AZ deployment, then manually take snapshots.

Answer

Migrate the database to a single large Amazon EC2 instance using AWS Application Migration Service.

Answer

Migrate to Amazon RDS with Multi-AZ deployment and use DMS for initial load.

Question 8

A company is migrating a legacy application to AWS. The application currently uses Oracle Database and the company wants to migrate to Amazon Aurora PostgreSQL with minimal downtime. Which TWO steps should be taken to achieve this? (Choose TWO)

Accepted Answer

Use the AWS Schema Conversion Tool (SCT) to convert the Oracle schema to PostgreSQL.. The AWS Schema Conversion Tool (SCT) can automatically convert Oracle database schemas (including stored procedures, views, and data types) to a PostgreSQL-compatible format, which is essential when migrating to Amazon Aurora PostgreSQL. Option D is correct because AWS DMS with ongoing replication (change data capture) allows you to keep the source Oracle database and target Aurora PostgreSQL synchronized with minimal downtime, enabling a near-zero-downtime migration by capturing and applying incremental changes.

Answer

Rehost the Oracle database on an Amazon EC2 instance to minimize changes.

Answer

Configure Amazon Aurora PostgreSQL with Multi-AZ for high availability.

Answer

Export Oracle database as dump files and import into Aurora PostgreSQL using native tools.

Question 9

A team is migrating an Oracle database to Amazon RDS for MySQL using AWS DMS with ongoing replication (CDC). The initial load succeeded, but the CDC task fails with the error shown in the exhibit. The source Oracle database is on-premises. Which action should the team take to resolve the issue?

Accepted Answer

Connect to the source Oracle database and enable full supplemental logging by executing the command: ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (ALL) COLUMNS;. AWS DMS requires full supplemental logging on the source Oracle database to capture all column values for CDC (ongoing replication). Without it, DMS cannot reconstruct the complete row changes from the redo logs, causing the CDC task to fail. Enabling full supplemental logging with `ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (ALL) COLUMNS;` ensures that every column is logged, allowing DMS to replicate all changes correctly.

Answer

Configure binary logging on the target MySQL RDS instance.

Answer

Stop and restart the DMS task to clear the error.

Answer

Switch the target database to Amazon RDS for Oracle to maintain compatibility.

Question 10

A company is migrating its on-premises web application to AWS. The application consists of a stateless web tier and a stateful database tier running on a single server. The web tier uses session data stored in the local file system. The database tier runs on MySQL. The company wants to minimize changes to the application code during migration. They plan to use Amazon EC2 for the web server and Amazon RDS for MySQL for the database. After migrating the web server to an EC2 instance and the database to RDS, users report that they are being logged out of the application frequently. What is the most likely cause of this issue?

Accepted Answer

The web server's session data is stored locally and is lost when the EC2 instance is replaced or restarted.. The web tier stores session data in the local file system of the EC2 instance. When the instance is replaced or restarted (e.g., due to Auto Scaling, instance failure, or a maintenance event), that local session data is lost. Since the application code was not modified to use a shared session store (like ElastiCache or DynamoDB), users lose their sessions and are logged out. This is the most likely cause because the migration explicitly minimized code changes and did not address the stateless web tier requirement.

Answer

The RDS instance's backup window is causing database connections to drop.

Answer

The application's session timeout setting was reduced during migration.

Answer

The security group for the web server is blocking inbound session cookies.

Question 11

Drag and drop the steps to automate the installation of SAP HANA on AWS using AWS CloudFormation into the correct order.

Accepted Answer

Create the CloudFormation template, then upload it to Amazon S3, then launch the stack, then verify the SAP HANA installation.. CloudFormation automation involves template creation, upload, stack launch, provisioning, and verification.

Answer

Create the CloudFormation template, then launch the stack, then upload it to Amazon S3, then verify the SAP HANA installation.

Answer

Upload the template to Amazon S3, then create the CloudFormation template, then launch the stack, then verify the SAP HANA installation.

Answer

Create the CloudFormation template, then upload it to Amazon S3, then verify the SAP HANA installation, then launch the stack.

Question 12

A company is migrating an on-premises SAP HANA database to AWS. The database size is 2 TB and the network bandwidth is 100 Mbps. The migration must minimize downtime and support incremental data synchronization. Which AWS service should the company use?

Accepted Answer

AWS Database Migration Service (DMS). AWS DMS supports ongoing replication and can migrate large databases with minimal downtime. Option A (AWS Direct Connect) provides dedicated network but is not a migration service. Option C (AWS Snowball) is for offline data transfer, not incremental sync. Option D (Amazon S3 Transfer Acceleration) speeds up uploads but does not handle database replication.

Answer

AWS Direct Connect

Answer

AWS Snowball

Answer

Amazon S3 Transfer Acceleration

Question 13

An organization is planning to migrate an SAP ERP system from on-premises to AWS. The system uses a custom ABAP application that has a hardcoded IP address for RFC connections. The migration strategy must minimize changes to the application. What is the MOST effective approach?

Accepted Answer

Assign an Elastic IP address to the SAP instance. Using an Elastic IP (Option D) ensures the public IP remains the same after migration, avoiding application changes. Option A (NAT Gateway) is for outbound traffic, not a fixed IP. Option B (VPC Peering) does not provide a fixed IP. Option C (DNS name) would require application changes.

Answer

Use a NAT Gateway to provide a fixed IP

Answer

Use VPC Peering to connect on-premises to AWS

Answer

Use a DNS name and update the application to use the DNS name

Question 14

During a migration of an SAP system to AWS, the SAP application team reports that batch jobs are failing with an error 'RFC connection refused'. The on-premises system and AWS are connected via a VPN. What is the MOST likely cause?

Accepted Answer

The security group attached to the SAP instance does not allow inbound RFC traffic. Security groups act as a virtual firewall for EC2 instances, controlling inbound and outbound traffic. If the security group for the SAP instance does not allow inbound RFC traffic (e.g., on ports 3300 or 3200 for SAP RFC), connections will be refused. Option B (VPN bandwidth) would cause timeouts or slow transfers, not immediate connection refusal. Option C (network ACLs) operates at the subnet level and stateless; they could block RFC ports, but since the error is specifically 'RFC connection refused' and it's a common misconfiguration, security groups are more likely the culprit. Option D (route table) is for routing traffic between networks; if there were no route to on-premises, traffic would not reach AWS at all, rather than being refused.

Answer

The VPN bandwidth is insufficient causing timeouts

Answer

The network ACLs are blocking the RFC ports

Answer

The route table does not have a route to the on-premises network

Question 15

A company is migrating an SAP BusinessObjects environment to AWS. They need to ensure high availability for the web tier and have a requirement to use a single DNS name for end users. Which AWS service should they use to distribute traffic across multiple web servers?

Accepted Answer

Application Load Balancer. Application Load Balancer (ALB) operates at Layer 7 and can distribute HTTP/HTTPS traffic across multiple web servers, providing health checks and a single DNS name. Option A (Amazon CloudFront) is a content delivery network, not a load balancer. Option B (Network Load Balancer) operates at Layer 4 and is ideal for TCP/UDP traffic, not web application traffic. Option C (Amazon Route 53 weighted routing policy) distributes traffic based on weights but does not provide built-in health checks or load balancing features like connection draining and path-based routing.

Answer

Amazon CloudFront

Answer

Network Load Balancer

Answer

Amazon Route 53 weighted routing policy