First off let's start out by saying that Isolated VLANs and Private VLANs are two completely different things... they are not at all the same. To a network administrator, this should make perfect sense. However, a Server or Virtualization Administrator may or may not know the different. Because of this, I hear many non-network Administrators toss around the term "Private VLAN", when they actually mean to say "Isolated Vlan", or more specifically what they are referring to is a "Non-Routable" VLAN.