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AWS Cloud Migration
Strengthen your understanding of enterprise AWS cloud migration with a collectio
| Question | Answer |
|---|---|
| What is the primary cause of enterprise cloud migration failures regarding application dependencies? | Undervaluing the complexity of application dependency requirements. |
| In the context of migration failure, what is 'architecture replication'? | Migrating workloads 'as-is' using an on-premises pricing model instead of modernizing for cloud services. |
| Why do post-migration cost optimization activities often fail to occur? | The migration team is frequently reassigned to the next priority project immediately after cutover. |
| According to the AWS MAP framework, how is 'Portfolio underestimation' prevented? | By using automated portfolio discovery and dependency mapping before planning. |
| Which AWS MAP phase focuses on creating a data-grounded inventory of the enterprise's application portfolio? | Phase 1: Assess. |
| What percentage of additional servers are typically discovered by automated tools compared to manual spreadsheets? | 20-40% more servers. |
| Term: AWS Migration Evaluator | Definition: A tool used to analyze on-premises TCO and produce a quantified 3-year cloud business case. |
| What is the risk of separating interdependent applications into different migration waves? | It creates production failures due to broken communication paths. |
| In AWS MAP, what is the primary purpose of the 'Mobilize' phase? | To build the AWS landing zone and prepare the organization's skills readiness. |
| Which AWS account in a Landing Zone structure is used for centralized CloudTrail log archives and security findings? | The Audit account. |
| What is the function of the 'Log archive account' in an AWS Control Tower environment? | Centralized S3 log storage with S3 Object Lock for write-once data protection. |
| Term: Service Control Policies (SCPs) | Definition: Preventive guardrails applied at the OU level to restrict actions like creating public S3 buckets. |
| Why must the AWS Landing Zone be built before the first production workload migrates? | Retrofitting a landing zone to an existing environment is significantly more complex and risks breaking running applications. |
| In migration wave planning, which type of workloads are typically included in Wave 1? | Non-production and low-risk workloads like dev, test, and QA environments. |
| Why should mission-critical applications be migrated in the final wave? | To ensure migration tooling, procedures, and team skills are at their most mature state. |
| What is the primary AWS service used for automated 'lift and shift' (Rehost) server migrations? | AWS Application Migration Service (AWS MGN). |
| How does AWS MGN ensure near-instantaneous data readiness for cutover? | It uses continuous block-level replication to keep a synchronized copy of the source server. |
| AWS MGN replication traffic typically uses which TCP ports? | TCP ports 443 (HTTPS) and 1500 (data replication). |
| During AWS MGN continuous replication, how is production traffic affected? | Production traffic is not interrupted as the agent does not use the source server storage I/O path. |
| What is the target downtime window for most applications using AWS MGN cutover? | 10-30 minutes. |
| By default, how many source servers can a single t3.small AWS MGN Replication Server support? | Up to 15 source servers. |
| What is the recommended minimum subnet size for a large-scale AWS MGN staging area? | /24 (256 IPs). |
| When should an enterprise use VMware Cloud on AWS (VMC) instead of AWS MGN? | When a fast data-centre exit is required without converting VMs to native EC2 instances. |
| The 7 Rs strategy 'Replatform' is also known as _____. | Lift-Tinker-and-Shift. |
| What is the primary difference between the 'Rehost' and 'Relocate' strategies? | Rehost converts servers to native EC2 instances, while Relocate keeps them as VMs on AWS-hosted VMware. |
| Under what condition is the 'Retire' strategy applied to an application? | If the application has fewer than 20 active users or zero CPU utilization over 30+ days. |
| Which 7 Rs strategy delivers the highest cloud benefit and TCO reduction but requires the most engineering investment? | Refactor / Re-architect. |
| In a typical 200-server portfolio, what percentage of applications are usually categorized as 'Rehost'? | 35-50%. |
| Why is database migration considered the most failure-prone component of cloud migration? | It combines high data criticality, technical complexity, and extreme cutover sensitivity. |
| Term: AWS DMS Replication Instance | Definition: A managed EC2 instance that reads data from the source database and writes it to the target. |
| Which AWS tool is required for heterogeneous database migrations to convert schema and code objects? | AWS Schema Conversion Tool (SCT). |
| What is the function of Change Data Capture (CDC) in AWS DMS? | It reads the source transaction log to apply real-time changes to the target after the initial full load. |
| According to the DMS cutover checklist, what is the maximum acceptable replication latency before cutover? | Below 5 seconds for at least 30 consecutive minutes. |
| Under the AWS Shared Responsibility Model, who is responsible for physical data center security? | AWS. |
| Who is responsible for patching the guest operating system on an EC2 instance? | The customer (organization). |
| Which AWS service is used to establish automated OS patching for migrated instances? | AWS Systems Manager Patch Manager. |
| What action is required to maintain HIPAA compliance when migrating PHI workloads to AWS? | Executing an AWS Business Associate Agreement (BAA). |
| How does EC2 'right-sizing' reduce cloud costs? | It uses CloudWatch data to resize instances so peak CPU remains below 70% and memory below 80%. |
| What is the typical cost reduction achieved by converting EBS volumes from GP2 to GP3? | 20% reduction. |
| Concept: S3 Intelligent-Tiering | Definition: An S3 storage class that automatically moves objects between access tiers based on usage to save costs. |
| How do VPC endpoints for S3 and DynamoDB reduce cloud spend? | They eliminate data transfer charges for traffic between EC2 and those specific services. |
| Which AWS service provides policy-based backup for EC2, RDS, and EFS across multiple accounts? | AWS Backup. |
| What is the role of the AWS Fault Injection Simulator (FIS) in migration? | It enables chaos engineering experiments to verify that the system handles failures (like RDS failover) as designed. |
| In the Mobisoft engagement model, when is the AWS Well-Architected Review delivered? | Within 30 days of migration completion. |
| What is the purpose of the 'Pilot migration' during the Mobilize phase? | To test the Landing Zone and migration procedures with 2-5 servers before full-scale waves begin. |
| What percentage of migration costs can AWS MAP funding typically offset for eligible enterprises? | 20-40%. |
| A successful migration at 12 months should show cloud spend _____ below on-premises TCO. | 25-40%. |
| What is the financial consequence of 'Architecture replication'? | Higher cloud costs than expected and erosion of the business case ROI. |
| Which AWS service is used to aggregate security findings from across all accounts into a single view? | Security Hub. |
| How does AWS MGN handle application testing before cutover? | It launches test instances in an isolated VPC while the source server continues to serve production traffic. |
| In the 7 Rs framework, what happens to an application categorized as 'Repurchase'? | It is replaced by a SaaS solution (e.g., moving from self-hosted email to Microsoft 365). |
| What is the 'Full load task' in AWS DMS? | The initial bulk transfer of all existing data from the source to the target database. |
| What is the 'Rollback Plan' decision timeframe during a database cutover? | A pre-agreed maximum number of minutes from the start of the cutover window. |
| For PCI-DSS compliance, which AWS service is implemented to protect CDE-facing endpoints? | AWS WAF (Web Application Firewall). |
| Which AWS EC2 instance family is recommended for memory-optimized DMS replication tasks? | The r5 family. |
| What happens to the source server after a successful AWS MGN cutover and validation? | It is archived for 30-60 days for rollback capability and then decommissioned. |
| How does the 'Retain' strategy differ from other migration strategies? | It keeps the application on-premises, often due to regulatory constraints or a planned retirement within 12 months. |
| Which tool provides data-driven recommendations for EC2 right-sizing post-migration? | AWS Compute Optimizer. |
| What is the typical duration of a Mobisoft Cloud Migration Assessment? | 2-4 weeks. |
| In AWS Control Tower, which account structure contains the centralized CloudTrail logs? | The Audit account. |
| Why is 'Wave 1' considered a risk calibration mechanism? | Failures discovered in non-production workloads are resolved before production workloads are at risk. |
| How does Graviton3 improve cloud economics compared to x86 instances? | It provides a 25-40% price/performance improvement. |
| Which AWS service uses ML-based threat detection across all accounts from Day 1 of a Landing Zone deployment? | GuardDuty. |
| What is the specific requirement for using AWS DMS with an Oracle source database for CDC? | Enabling Supplemental Logging at the schema level. |
| Term: AWS Artifact | Definition: A service used to retrieve AWS compliance reports like SOC 2 or the PCI-DSS Attestation of Compliance. |
| What is the 'Staging Area' in the context of AWS MGN? | A temporary AWS environment where Replication Servers receive and write source data to EBS volumes before cutover. |
Created by:
mobisoftinfotech