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Tick down five boxes in the host column and take two away (for the subnet and broadcast) to give you 30 hosts per subnet. Voila! If you want to know the subnet mask tick down three (for the subnet bits stolen) columns in the top subnet column giving you 224 or in full 255.255.255.224 which is 8+8+8+3 or /27 masked bits. *I have uploaded several free subnetting videos to YouTube via Route SummarizationYou need to be able to work this out for the exam. It is basically advertising out as few routes as possible from your network. You can only really work out a summary route by converting the IP address into binary (sorry). If you don’tdo this then you have no way of knowing if you are advertising the correct summary route which will lead to problems on your network.19 paulwbrowning
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