title: Are there differences in networking performance if EC2 instances are in different subnets?
body: <p>In an AWS VPC, is there any difference in networking performance (or in risk of networking failure) between EC2 instances these two scenarios?</p>
  
  <p>A) An EC2 instance in subnet <em>Data</em> communicating with an EC2 instance in subnet <em>Apps</em>. Both subnets belong to the same availability zone. </p>
  
  <p>B) Two EC2 instances in a single subnet <em>Data+apps</em>.</p>
  
  <p>I'm asking because even when Windows <code>route print</code> shows <code>On-link</code> for the subnet and a route to a gateway for other subnets in the VPC, I suspect that in the background there are no real differences in the routing that takes place.</p>