title: Finding network addresses
body: <p>Consider a router that interconnects three subnets: Subnet1, Subnet2, and Subnet3.
  Suppose all of the interfaces in each of these three subnets are required to have the prefix
  223.1.17/24. Also suppose that Subnet #1 is to support at least 60 interfaces 
  Subnet #2 is to support at least 90 interfaces
  Subnet #3 is to support at least 12 interfaces.  Provide
  three network addresses (of the form a.b.c.d/x) that satisfy these constraints.</p>
  
  <p>What I thought is 
  Subnet 1: 223.1.17.0/26
  Subnet 2: 223.1.17.64/25
  Subnet 3 : 223.1.17.192/28</p>
  
  <p>Is this correct?</p>