Determine load balancer SKUs
When you create an Azure Load Balancer, you select the type (Internal or Public) of load balancer. You also select the SKU. The load balancer supports both Basic and Standard SKUs, each differing in scenario scale, features, and pricing. The Standard Load Balancer is the newer Load Balancer product with an expanded and more granular feature set over Basic Load Balancer. It is a superset of Basic Load Balancer.
Up to 300 instances
Up to 1000 instances
HTTPS, HTTP, TCP
Zone-redundant and zonal frontends for inbound and outbound traffic.
Multiple front ends
Inbound and outbound
Secure by default
Open by default. NSG optional.
Closed to inbound flows unless allowed by an NSG. Internal traffic from the virtual network to the internal load balancer is allowed.
The Basic SKU can be upgraded to the Standard SKU. But, new designs and architectures should use the Standard Load Balancer.