Which of the following should be used when migrating virtual machines hosted in an on-premises location to an AWS VPC?
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A. B. C. D.Answers: C and D.
Option A is incorrect because having a NAT instance is not going to help in this scenario.
NAT instance is used so that the instances in the private subnet can communicate with the internet.
Option B is incorrect, as a static IP address will not help in "migrating a legacy application" that is located on an on-premise location.
Option C is CORRECT because AWS SMS is a dedicated and agentless service that simplifies and expedites the migration to the cloud.
Option D is CORRECT because the VM Import facility provided by AWS can be used to import virtual machine images.
https://docs.aws.amazon.com/vm-import/latest/userguide/what-is-vmimport.html.
When migrating virtual machines hosted in an on-premises location to an AWS VPC, the recommended method is to use AWS Server Migration Service (SMS).
AWS Server Migration Service is a fully managed service that allows you to migrate on-premises servers, virtual machines, or cloud instances to AWS. It simplifies the migration process by automating many of the manual steps involved in migrating workloads to the cloud, including replication of on-premises servers and their data to AWS, and the creation of Amazon Machine Images (AMIs) in preparation for launch in the cloud.
Using a NAT instance to route traffic from the instance in the VPC (Option A) or using a static IP address on the VPC instance (Option B) are not directly related to the migration process and do not provide any benefit in terms of migrating virtual machines.
VM Import (Option D) is a service that allows you to import virtual machine images from your existing virtualization environment to Amazon EC2 instances. It can be used to migrate virtual machines to AWS, but it requires a manual process of creating an image of the virtual machine and uploading it to AWS.
Therefore, the best option for migrating virtual machines hosted in an on-premises location to an AWS VPC is to use AWS Server Migration Service (SMS).