A user has created an ELB with the availability zone US-East-1. The user wants to add more zones to ELB to achieve High Availability. How can the user add more zones to the existing ELB?
A.
It is not possible to add more zones to the existing ELB
B.
The only option is to launch instances in different zones and add to ELB
C.
The user should stop the ELB and add zones and instances as required
D.
The user can add zones on the fly from the AWS console
I vote B.
"Elastic Load Balancing automatically distributes your incoming traffic across multiple targets, such as EC2 instances, containers, and IP addresses, in one or more Availability Zones." -- https://docs.aws.amazon.com/elasticloadbalancing/latest/application/introduction.html#application-load-balancer-components
The question highlights "adding AZ" but what important is "adding instances from the AZ".
Correct Answer: D
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-subnets.html
"You can enable or disable the Availability Zones for your load balancer at any time. After you enable an Availability Zone, the load balancer starts routing requests to the registered targets in that Availability Zone. "
I agree with D
ALB is not allowed if you select only one AZ
CLB automatically select all AZ available on the region
NBL is allowed even with no AZ selected. A notification is provided "Temporary limitation
Choose your Availability Zones and subnets with care. After you create the load balancer, you cannot disable the enabled subnets, but you can enable additional ones."
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