Design Resilient Architectures
Free AWS Certified Solutions Architect – Associate (SAA-C04) practice — 6 questions on Design Resilient Architectures, with explanations. No sign-up. Full 12-question mixed test →
A company's order-processing platform must meet a strict recovery requirement: RTO of 5 minutes and RPO of 1 minute. The disaster recovery environment must be able to scale to full production capacity within the RTO window, but the company wants to avoid paying for fully running production-scale infrastructure in the DR region at all times. Which DR strategy BEST meets these requirements?
Warm standby keeps a scaled-down version of the entire stack (compute, database, etc.) always running, so scaling to full capacity happens quickly (minutes), fitting a 5-minute RTO, while costing less than full active-active.
A global application serves users from ALB endpoints deployed in three AWS Regions. The company wants users routed to whichever region provides the lowest network latency under normal conditions, but wants Route 53 to automatically stop sending traffic to any region whose ALB becomes unhealthy, without manual intervention. Which Route 53 configuration BEST meets these requirements?
Latency-based routing directs users to the region with the lowest latency, and associating a health check with each latency record makes Route 53 automatically exclude unhealthy regions from DNS responses, satisfying both requirements.
A financial services company runs a MySQL-compatible relational workload and needs a cross-region disaster recovery solution with a target RPO of about 1 second and the ability to promote the secondary region to be writable within roughly 1 minute during a regional outage. Which solution BEST meets these requirements?
Aurora Global Database uses dedicated storage-layer replication with typical lag under 1 second and supports promoting a secondary region to full read/write in about 1 minute, meeting both the RPO and RTO targets for a relational workload.
A company uses DynamoDB Global Tables replicated across two Regions to support active-active writes. During a network partition, the same item is updated in both Regions at nearly the same time before replication completes. How does DynamoDB Global Tables resolve this write conflict once connectivity is restored?
DynamoDB Global Tables use a last-writer-wins conflict resolution approach, where the write with the latest internal timestamp across regions is the one that persists after replication converges.
A company must insert third-party virtual firewall appliances transparently in-line for all inbound VPC traffic, inspecting and filtering packets at the network layer, while preserving the original source and destination IP addresses and scaling the appliance fleet automatically with demand. Which AWS load balancing solution BEST supports this requirement?
Gateway Load Balancer is purpose-built to distribute traffic to fleets of third-party virtual appliances (firewalls, IDS/IPS) using GENEVE encapsulation on port 6081, preserving original packet headers while transparently load balancing and auto scaling the appliance layer.
An S3 bucket already contains one million existing objects and has versioning enabled. The company now enables Cross-Region Replication (CRR) to a bucket in another Region. Which statement correctly describes the resulting replication behavior?
S3 CRR only replicates objects created or updated after the replication rule is enabled; pre-existing objects require S3 Batch Replication to backfill them. Delete marker replication is an opt-in setting within the replication rule, not enabled by default.
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