You plan an IPv6-only virtual network with 10 subnets. Each subnet will host up to 200 VMs behind a load balancer. The VMs and the load balancer must be reachable only from inside the virtual network, and you must minimize costs. Which load-balancing solution should you recommend?
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Correct answer: Azure Standard Load Balancer.
Why this is the answer
Azure Standard Load Balancer supports IPv6, internal load balancing, and is suitable for up to 1000 instances per backend pool, meeting the requirement for 200 VMs per subnet across 10 subnets (2000 VMs total). It is also cost-effective for internal-only scenarios. Basic Azure Load Balancer does not support IPv6. Azure Application Gateway v1 and v2 are Layer 7 (HTTP/S) load balancers, which are more expensive and complex than needed for a simple internal Layer 4 load balancing requirement, and v1 does not support IPv6.
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