A company hosts an application on Amazon EC2 instances that run in a single Availability Zone. The application is accessible by using the transport layer of the Open Systems Interconnection (OSI) model. The company needs the application architecture to have high availability.
Which combination of steps will meet these requirements MOST cost-effectively? (Choose two.)
To achieve high availability for the application running on EC2 instances in a single Availability Zone, it is necessary to distribute the load across multiple Availability Zones and ensure that resources can automatically scale in response to demand. Configuring a Network Load Balancer (NLB) is effective in this scenario because NLBs operate at the transport layer (OSI Layer 4) and are well-suited for handling TCP traffic, which is the specified layer in the question. Additionally, creating an Auto Scaling group and configuring it to use multiple Availability Zones ensures that new instances can be launched in another AZ if one becomes unavailable, enhancing the fault tolerance and high availability of the application without overcomplicating or incurring unnecessary costs.
No word about the HTTP/application layer, only OSI 4 - TCP > B, an NLB should be enough D: for Autoscaling.
AnswerBD There is no information about the ports numbers and only that means that we need to use NLB, ALB is only for HTTP hence there is no point of using that solution as connection can be done via any port for exampl 4000 Autoscaling with instances in multiple AZ is the best solution. it will allow run new EC2 if it fail and in case if whole AZ will go down we will have 2nd one.
transport layer means just NLB.
as it mention "The application is accessible by using the transport layer" which is TCP, so no more information or reason to use ALB as well, so I will go for B+D
question says the application is running on Transport Layer. i dont think there is need for ALB
B- since network layer operates at layer 4 i.e transport layer D- for hHA
Edited-D option for HA
as it mention "The application is accessible by using the transport layer" which is TCP, so no more information or reason to use ALB as well, so I will go for B+D