ANS-C01 Question 90
Select 2You are designing an application architecture that requires high performance and flexibility in how traffic is routed to backend services. The backend services include virtual machines, containers, and IP-based endpoints. Which configuration options for an Application Load Balancer (ALB) target group should be selected to achieve this requirement?
- A
Use the 'Instance' target type to route traffic to EC2 instances using their instance IDs.
- B
Use the 'IP' target type to route traffic to specific IP addresses, including on-premises endpoints.
- C
Use the 'Lambda' target type to send requests directly to AWS Lambda functions.
- D
Use the 'TCP' protocol for target groups to support Layer 4 traffic routing.
- E
Use the 'GENEVE' protocol to route encapsulated traffic to virtualized network functions.
Show answer and explanation
Correct answers: A, B
Explanation
To meet the requirement of routing traffic to various backend services, including virtual machines, containers, and IP-based endpoints, the 'Instance' and 'IP' target types are the most suitable options. The 'Instance' target type integrates directly with EC2 instances, while the 'IP' target type offers flexibility to include endpoints outside the AWS environment. Other options, such as 'Lambda' and protocols like 'TCP' and 'GENEVE,' do not align with the scenario requirements or are specific to other AWS services.
- A. Correct.
Using the 'Instance' target type is appropriate when routing traffic directly to EC2 instances, as the load balancer communicates with instances using their instance IDs. This ensures tight integration with AWS EC2 services.
- B. Correct.
Using the 'IP' target type allows routing traffic to IP addresses, which is suitable for backend services running outside the AWS environment (e.g., on-premises or in other cloud environments).
- C. Incorrect.
The 'Lambda' target type is only used when the load balancer routes traffic to AWS Lambda functions, which is not a requirement in the given scenario.
- D. Incorrect.
The 'TCP' protocol is used for Layer 4 load balancing, which is not suitable for Application Load Balancers (ALBs) that operate at Layer 7 and support HTTP/HTTPS. This option does not apply to the question's requirements.
- E. Incorrect.
The 'GENEVE' protocol is specific to AWS Gateway Load Balancer and is used for encapsulating traffic for virtualized network functions. It is not applicable to Application Load Balancers.