ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question
You are reviewing the architecture of a SaaS application whose Kubernetes cluster, databases, and storage currently run entirely in a single cloud availability zone. Daily backups are taken to object storage. From a resiliency standpoint, which change would provide the most benefit while adding only moderate cost?
Extend the cluster to a second availability zone and configure automatic failover of services and data.
Raise CPU limits and requests on all pods to handle usage spikes.
Create read-only database replicas within the same availability zone.
Attach high-performance NVMe SSDs to each node for faster local caching.
Resiliency seeks to keep the service operating despite failures. Running every component in one availability zone creates a single point of failure; if that zone suffers an outage, the entire application becomes unavailable even though backups exist. Distributing worker nodes and data stores across a second availability zone and enabling automatic failover removes this single point and allows workloads to continue in the alternate zone with minimal interruption. Adding replicas inside the same zone, raising CPU limits, or using faster local storage may improve performance, but they do not protect against a full-zone outage, so they contribute far less to overall resiliency.
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What is an availability zone in cloud architecture?
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
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