For a mission-critical application that requires 99.99% availability, which ECS networking solution components should be implemented?

Question

Options

• AMultiple Availability Zones deployment
• BSingle instance deployment in one Availability Zone
• CApplication Load Balancers with health checks
• DNetwork Load Balancers for TCP traffic

• A
  76% (13)
• B
  24% (4)

Explanation

Achieving 99.99% availability requires eliminating single points of failure across multiple dimensions: Multi-AZ deployment (A) ensures your containers survive an entire data center outage by spreading workloads across physically separate locations; Application Load Balancers with health checks (C) automatically route traffic away from unhealthy containers and distribute load across healthy instances; and Network Load Balancers for TCP traffic (D) provide ultra-low latency Layer 4 load balancing for non-HTTP workloads, maintaining connection resilience. Option B (single instance, single AZ) is the direct antithesis of high availability - one hardware failure takes down the entire application, making 99.99% uptime mathematically impossible. The key insight is that high availability is layered: redundant infrastructure (Multi-AZ) + intelligent traffic routing (ALB) + protocol-appropriate load balancing (NLB) working together.

Memory tip: Think "HAL" - High availability needs AZs + Load balancers. If a question mentions 99.99% or "mission-critical," any option with "single" in it is always wrong.

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