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Zorluk: OrtaHigh Availability and Disaster Recovery Design

A medical device company is designing a high availability and disaster recovery architecture for its patient monitoring dashboard. The primary database runs on an Amazon Aurora PostgreSQL DB cluster in the us-east-1 Region. The system requires an RTO of 15 minutes and an RPO of 5 minutes. The architecture must span a secondary Region (us-west-2) for disaster recovery. The network design requires private connections from on-premises hospitals using AWS Direct Connect, routing through Transit Gateways in both Regions.

Which TWO network and database configuration designs should the Solutions Architect implement to meet the HA/DR requirements? (Select TWO.)

  1. Configure Amazon Aurora Global Database with a secondary DB cluster in the secondary Region, and use Route 53 Application Recovery Controller routing controls to manage traffic routing during failover.Cevap
  2. Deploy a dedicated NAT Gateway in each Availability Zone of the private subnets' VPCs to ensure outbound connectivity remains highly available across all active zones.Cevap
  3. C
    Establish cross-region disaster recovery by running hourly database snapshot copies to the secondary Region and executing a restore process during failover.
  4. D
    Deploy a single NAT Gateway in a single public subnet in the primary Region and configure all private subnets across all Availability Zones to route outbound traffic through it.
  5. E
    Configure a Route 53 Private Hosted Zone for service resolution in the primary Region without associating it with the VPCs located in the secondary Region.
  6. F
    Configure the secondary DB cluster to scale Aurora Replicas dynamically in the recovery Region to handle database writes synchronously with the primary cluster's write endpoint.

Cevap

Configure Amazon Aurora Global Database with a secondary DB cluster using Route 53 Application Recovery Controller, and deploy a dedicated NAT Gateway in each Availability Zone of the private subnets' VPCs.
Implementing Amazon Aurora Global Database ensures sub-second asynchronous replication, which fits well within the 5-minute RPO constraint, while Route 53 Application Recovery Controller facilitates fast multi-region routing failovers to meet the 15-minute RTO. Additionally, placing a NAT Gateway in every Availability Zone guarantees that a failure in one zone does not disrupt egress traffic for instances located in other zones, preserving high availability.

Adım Adım Çözüm

1
Analyze database replication and failover mechanisms for multi-region DR.
Amazon Aurora Global Database provides the low-latency asynchronous replication required to achieve the 5-minute RPO, and using Route 53 Application Recovery Controller routing controls allows failover orchestration within the 15-minute RTO.
Traditional backups or snapshot-based replication cannot satisfy these aggressive recovery objectives due to copy frequencies and restoration times.
2
Evaluate NAT configuration for outbound high availability.
A dedicated NAT Gateway is placed in each Availability Zone so that outbound internet traffic from private subnets is resilient to a single-zone outage.
Sharing a single NAT Gateway across multiple Availability Zones introduces a single point of failure, violating high availability principles.
3
Ensure internal DNS resolution is fully functional in both the primary and disaster recovery Regions.
The Route 53 Private Hosted Zone must be associated with all active and recovery VPCs.
If the Private Hosted Zone is not associated with the secondary Region's VPCs, name resolution will fail upon disaster recovery activation.

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