AWS Certified Advanced Networking – Specialty (ANS-C01) — Question 29

A company is hosting an application on Amazon EC2 instances behind a Network Load Balancer (NLB). A solutions architect added EC2 instances in a second Availability Zone to improve the availability of the application. The solutions architect added the instances to the NLB target group.
The company's operations team notices that traffic is being routed only to the instances in the first Availability Zone.
What is the MOST operationally efficient solution to resolve this issue?

Answer options

• A. Enable the new Availability Zone on the NLB
• B. Create a new NLB for the instances in the second Availability Zone
• C. Enable proxy protocol on the NLB
• D. Create a new target group with the instances in both Availability Zones

Correct answer: A

Explanation

The correct answer is A because enabling the new Availability Zone on the NLB allows for proper traffic distribution across both Availability Zones. Option B is incorrect as creating a new NLB would be unnecessary and adds complexity. Option C does not address the routing issue related to Availability Zones, and Option D would not be efficient as it requires additional management of a new target group.