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Zorluk: OrtaHigh Availability and Disaster Recovery Design

An organization is designing a multi-region disaster recovery and high availability architecture for a critical web application. The primary region is us-east-1, and the secondary region is us-west-2. The application's database layer uses an Amazon Aurora PostgreSQL cluster. The business specifies a Recovery Time Objective (RTO) of 15 minutes and a Recovery Point Objective (RPO) of 5 minutes. Additionally, outbound internet connectivity from the private application subnets in both regions must remain highly available, ensuring that an outage in a single Availability Zone does not impact outbound traffic from other zones. Which combination of actions should the solutions architect implement to meet these requirements? (Select TWO.)

  1. Configure an Amazon Aurora Global Database with the primary cluster in us-east-1 and a secondary cluster in us-west-2, and promote the secondary cluster if the primary region experiences an outage.Cevap
  2. Deploy a NAT Gateway in each Availability Zone in both regions, and configure private subnet route tables to direct outbound internet traffic to the NAT Gateway in the same Availability Zone.Cevap
  3. C
    Implement daily AWS Backup copy jobs to replicate database snapshots from us-east-1 to us-west-2, and restore the database to a new instance during a failover event.
  4. D
    Deploy a single NAT Gateway in the primary Availability Zone of each region, and point the route tables of all private subnets across all Availability Zones to this NAT Gateway.
  5. E
    Create an Amazon Route 53 private hosted zone for internal domain name resolution, but associate it only with the primary region's VPC, relying on Transit Gateway to route DNS queries from the secondary region's VPC.

Cevap

Configure an Amazon Aurora Global Database with the primary cluster in us-east-1 and a secondary cluster in us-west-2, and deploy a NAT Gateway in each Availability Zone in both regions.
The correct actions are promoting a secondary cluster in an Amazon Aurora Global Database and deploying a NAT Gateway in each Availability Zone. Amazon Aurora Global Database supports cross-region replication with latency of less than 1 second, fulfilling the 5-minute RPO. Promoted secondary clusters become read-write capable within minutes, satisfying the 15-minute RTO. Additionally, provisioning a NAT Gateway in every Availability Zone ensuring traffic routes to the local zone's gateway guarantees that outbound connectivity is not lost across the region if one Availability Zone suffers an outage.

Adım Adım Çözüm

1
Select a database replication strategy that supports near-zero RPO and low-latency failover.
Amazon Aurora Global Database provides replication latency under 1 second and quick promotion of secondary regions, fitting the 5-minute RPO and 15-minute RTO constraints.
Traditional daily backups or snapshot replication cannot guarantee a 5-minute RPO or a sub-15 minute recovery timeframe.
2
Ensure outbound connectivity in the private subnets is highly available across multiple Availability Zones.
A NAT Gateway must be provisioned in each Availability Zone, and private routing tables configured to direct outbound traffic to the local zone's NAT Gateway.
Deploying a single NAT Gateway per region creates a single point of failure, meaning an outage in that specific zone would disable outbound internet access for all other zones.

Anahtar Kavram

Multi-region disaster recovery with Aurora Global Database and high availability routing via redundant NAT Gateways across Availability Zones.
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High Availability and Disaster Recovery Design

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