AWS Certified SysOps Administrator – Associate (legacy) — Question 100

A user has configured ELB with two EBS backed EC2 instances. The user is trying to understand the DNS access and IP support for ELB. Which of the below mentioned statements may not help the user understand the IP mechanism supported by ELB?

Answer options

• A. The client can connect over IPV4 or IPV6 using Dualstack
• B. ELB DNS supports both IPV4 and IPV6
• C. Communication between the load balancer and back-end instances is always through IPV4
• D. The ELB supports either IPV4 or IPV6 but not both

Correct answer: D

Explanation

The correct answer is D because it inaccurately suggests that ELB can only support either IPV4 or IPV6, while in reality, ELB can support both protocols simultaneously. Options A, B, and C correctly describe the capabilities and behavior of ELB with respect to IP addressing.