AWS Certified Solutions Architect - Associate
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A company is concerned that two NAT instances in use will no longer be able to support the traffic needed for the company's application. A solutions architect wants to implement a solution that is highly available, fault tolerant, and automatically scalable. What should the solutions architect recommend?
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UAnonymous
A
Remove the two NAT instances and replace them with two NAT gateways in the same Availability Zone.
B
Use Auto Scaling groups with Network Load Balancers for the NAT instances in different Availability Zones.
C
Remove the two NAT instances and replace them with two NAT gateways in different Availability Zones.
D
Replace the two NAT instances with Spot Instances in different Availability Zones and deploy a Network Load Balancer.
Explanation:
Explanation
Correct Answer: C - Remove the two NAT instances and replace them with two NAT gateways in different Availability Zones.
Why Option C is Correct:
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NAT Gateways vs NAT Instances: NAT gateways are AWS-managed services that are inherently more resilient, scalable, and fault-tolerant than NAT instances. They automatically scale up to 45 Gbps of bandwidth and are managed by AWS.
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High Availability: Deploying NAT gateways in different Availability Zones ensures high availability. If one Availability Zone fails, the NAT gateway in another AZ can continue to handle traffic.
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Automatic Scalability: NAT gateways automatically scale their bandwidth up to 45 Gbps without any manual intervention, meeting the requirement for automatic scalability.
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Fault Tolerance: NAT gateways are designed with redundancy within an Availability Zone and provide built-in failover capabilities.
Why Other Options are Incorrect:
Option A: Placing two NAT gateways in the same Availability Zone does not provide high availability across AZs. If that AZ fails, both NAT gateways would be unavailable.
Option B: Using Auto Scaling groups with Network Load Balancers for NAT instances adds complexity and still relies on self-managed NAT instances, which require patching, monitoring, and maintenance. This is less resilient than AWS-managed NAT gateways.
Option D: Using Spot Instances for NAT functionality is not recommended as Spot Instances can be terminated with short notice. NAT functionality requires persistent, reliable connectivity which Spot Instances cannot guarantee.
Key AWS Concepts:
- NAT Gateway: AWS-managed service for NAT functionality
- Availability Zones: Independent data centers within a region
- High Availability: Deploying resources across multiple AZs to ensure service continuity
- Automatic Scaling: NAT gateways scale automatically without manual intervention
This solution provides the best combination of high availability, fault tolerance, and automatic scalability while reducing operational overhead compared to managing NAT instances.
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