An enterprise is planning to migrate a mission-critical multi-tier application from an on-… — AWS Certified Solutions Architect - Professional

An enterprise is planning to migrate a mission-critical multi-tier application from an on-premises VMware vSphere cluster to a newly provisioned VMware Cloud on AWS (VMC on AWS) Software-Defined Data Center (SDDC). The application comprises:

* ` $15$ ` transactional database virtual machines (VMs) requiring zero downtime and continuous replication to meet a Recovery Time Objective (RTO) of zero during switchover.
* ` $105$ ` web and application server VMs that can tolerate a brief service interruption (maximum ` $15\text{ minutes}$ ` of downtime for a reboot) during cutover.

The network architecture requires transitive routing between the on-premises datacenter, the VMC on AWS SDDC, and four spoke VPCs in a multi-account AWS Organization. An existing ` $10\text{ Gbps}$ ` AWS Direct Connect (DX) connection terminates at a Direct Connect Gateway (DXGW) in a shared network account. The migrated VMs must also resolve private DNS records in an AWS Route 53 Private Hosted Zone (PHZ) managed in a Shared Services account.

Which combination of actions will meet these requirements with the least operational overhead? (Select TWO.)

Deploy VMware HCX. Configure Replication-Assisted vMotion (RAV) to migrate the ` $15$ ` transactional database VMs to ensure zero downtime during switchover. Configure HCX Bulk Migration for the ` $105$ ` web and application server VMs to replicate data in the background and execute a scheduled switchover with a brief reboot.Answer
Establish a VMware Cloud on AWS Transit Connect to peer the SDDC with an AWS Transit Gateway in the network account. Attach the Direct Connect Gateway to the AWS Transit Gateway using a Transit Virtual Interface (Transit VIF) for transitive routing. Associate the Route 53 Private Hosted Zone with the SDDC's connected VPC.Answer
C
Install the AWS Application Migration Service (MGN) agent on all VMs. Replicate the ` $15$ ` database VMs using MGN replication over a Public Virtual Interface (Public VIF) on the Direct Connect connection to ensure zero-downtime switchover.
D
Attach the Direct Connect Gateway directly to the VMware Cloud on AWS SDDC and the spoke VPCs using Private Virtual Interfaces (Private VIFs). Configure static routing on the Direct Connect Gateway to enable direct transitive routing between the VMC on AWS SDDC and the spoke VPCs.
E
Configure a Route 53 inbound resolver endpoint in the Shared Services VPC. Direct all DNS queries from the VMC on AWS SDDC VMs to the inbound resolver endpoint IP addresses without associating the Private Hosted Zone with the SDDC's connected VPC.

Answer

The correct actions are: (1) Deploy VMware HCX, using Replication-Assisted vMotion (RAV) for the database virtual machines and Bulk Migration for the remaining virtual machines. (2) Establish a VMware Cloud on AWS Transit Connect peered with an AWS Transit Gateway, attach the Direct Connect Gateway via a Transit VIF, and associate the Private Hosted Zone with the connected VPC.

For the migration, VMware HCX is the recommended tool for vSphere-to-VMC migrations. HCX Replication-Assisted vMotion (RAV) replicates data in the background and switches over live, satisfying the zero-downtime requirement for database virtual machines. HCX Bulk Migration replicates data in the background and reboots the target virtual machine, which satisfies the web and application server virtual machines' downtime limit of 15 minutes. For connectivity, VMware Cloud on AWS Transit Connect peered with an AWS Transit Gateway in the customer account enables transitive routing when combined with a Direct Connect Gateway attached using a Transit VIF. To enable DNS resolution of private records, the Private Hosted Zone must be associated with the connected VPC where the SDDC interfaces with AWS services.

Step-by-Step Solution

Select the appropriate migration tool and profiles for each tier.

Choose VMware HCX. Use Replication-Assisted vMotion (RAV) for the 15 database VMs requiring zero downtime, and Bulk Migration for the 105 web/app VMs that can tolerate a reboot.

HCX is the native migration solution for VMware to VMC. RAV enables zero-downtime hot migration in parallel, and Bulk Migration enables high-throughput scheduled switchovers with a brief reboot.

Establish transitive hybrid network routing.

Peer the VMware Transit Connect with an AWS Transit Gateway, and attach the Direct Connect Gateway to the Transit Gateway using a Transit VIF.

VMC Transit Connect combined with Transit Gateway enables transitive routing across on-premises, the VMC SDDC, and the spoke VPCs, which is not supported by Direct Connect Gateway alone.

Ensure DNS resolution for AWS Private Hosted Zones from the VMC SDDC.

Associate the Route 53 Private Hosted Zone in the Shared Services account with the SDDC's connected VPC.

Since DNS resolution for the SDDC traverses the connected VPC's Route 53 Resolver, associating the PHZ with the connected VPC enables VMC VMs to resolve the private DNS names.

Key Concept

VMware Cloud on AWS hybrid migration using HCX (RAV and Bulk Migration), transitive routing using Transit Connect and AWS Transit Gateway, and Private Hosted Zone VPC association.

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