title: Why does an AWS application load balancer require two subnets?
body: <p>When trying to create an application load balancer on aws (up until now I was using the classic ones just fine), I get the following message:</p>
  
  <p><code>At least two subnets must be specified</code></p>
  
  <p>Why would an ALB require me to specify two subnets ? Is there any way to create it and use it to LB between instances in a single subnet ?</p>