I have a good understanding of networking but I'm not really able to answer this question. A current client is running out IP addresses in a /24 network. They will soon be implementing a VOIP solution, requiring more space. On top of that, there is very little structure to the current IP scheme. Up to now I've been planning on a redesign that will allow for a great deal of growth, which is quite possible over the next 24 months. I was planning on redesigning into a /22 network. This client is in one very large building. They are in only the one physical location, besides the odd sales rep working from home.
Is this the best course of action or would it be better to use VLANs to subdivide the network? Why?