A company hosts an application on Amazon EC2 instances in a single Availability Zone. The application uses the transport layer of the OSI model. The company needs to make the application architecture highly available. Which combination of steps will meet this requirement MOST cost-effectively? (Choose two.)
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Correct answer: Configure a Network Load Balancer in front of the EC2 instances., Create an Auto Scaling group for the EC2 instances. Configure the Auto Scaling group to use multiple Availability Zones. Configure the Auto Scaling group to run application health checks on the instances..
Why this is the answer
To achieve high availability cost-effectively for an application using the transport layer (TCP/UDP) and hosted on EC2 instances, you need redundancy across Availability Zones and a way to distribute traffic. A Network Load Balancer (NLB) operates at the transport layer (Layer 4) and is ideal for applications that rely on TCP/UDP protocols. It can distribute traffic across instances in multiple Availability Zones, providing high availability and fault tolerance. An Auto Scaling
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