Certified Security - Specialty

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ALBs only need 2 subnets, not 2 public subnets

The course specifies that ALBs need 2 public subnets.  In reality, you can make one with two private subnets, there is even a scheme configuration item of internal or internet-facing.  So, the only real requirement for subnets is to have two, not that they be public.

2 Answers

Good call, although the most common use would of course be for 2 public subnets

You need "at least one public subnet in each of the Availability Zones used by your targets". So 2 Pvt (or all Pvt) will not work.

When you are doing HA etc you would have multi-AZ so you would need multiple public subnets for LB. But no matter 1 public subnet minimum is a must.

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