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?
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
Explanation:
Elastic Load Balancing supports both Internet Protocol version 6 (IPv6. and Internet Protocol
version 4 (IPv4.. Clients can connect to the user’s load balancer using either IPv4 or IPv6 (in EC2-
Classic. DNS. However, communication between the load balancer and its back-end instances
uses only IPv4. The user can use the Dualstack-prefixed DNS name to enable IPv6 support forcommunications between the client and the load balancers. Thus, the clients are able to access
the load balancer using either IPv4 or IPv6 as their individual connectivity needs dictate.
1. Load balancers in a VPC support IPv4 addresses only.
2. Load balancers in EC2-Classic support both IPv4 and IPv6 addresses
Ans is D. if it is not in vpc then it support both using dualstack.
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Answer is D according pass4sure.
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