Hi, all: I'm working toward a CCNA, and I'm struggling with a specific type of question. Essentially, it's the: 'You have four sites: site 1 with 500 hosts, site 2 with 100 hosts, site 3 ...' The question asks that you develop a subnet scheme for the sites, and gives all of the correct answers plus a few incorrect answers to choose from. So here's the problem... I can set up a subnet scheme with VLSM all day - that's not too difficult. The number of possible permutations of subnets, however is huge. Trying to wade through all of the different ways to sort and reorder subnets in a VLSM table to figure out one specific answer is just too time consuming. I can't help but think I'm missing the correct approach to solving this type of problem. Any suggestions? Thanks.