AWS Certified Solutions Architect – Professional — Question 112

An organization is creating a VPC for their application hosting. The organization has created two private subnets in the same AZ and created one subnet in a separate zone.
The organization wants to make a HA system with the internal ELB.
Which of these statements is true with respect to an internal ELB in this scenario?

Answer options

• A. ELB can support only one subnet in each availability zone.
• B. ELB does not allow subnet selection; instead it will automatically select all the available subnets of the VPC.
• C. If the user is creating an internal ELB, he should use only private subnets.
• D. ELB can support all the subnets irrespective of their zones.

Correct answer: A

Explanation

The correct answer is A because an ELB can only be associated with subnets in a single availability zone at a time. Option B is incorrect as ELBs allow for subnet selection, and C is misleading because while internal ELBs should be in private subnets, it's not the only requirement. Option D is wrong since ELBs cannot span across multiple availability zones with subnets from different zones.