So why would /u/professormesser 's Subnetting Chart say a /20 would give you 16 addresses? Also helps for calculating wildcards and various other binary operations. By the time I took my CCNA, I didn't even have to write it down anymore. It sounds more complicated than it is until you try it, and is also very fast and you'll eventually have that burned into your brain. You can write out subscript going in the opposite direction for the number of networks, but requires a bit more work. Subtract one from that number for the broadcast and one for the network ID, and there's your available hosts! The superscript label of that last "1" bit is your "Delta" or "magic number" or whatever you want to call it.
#CLASS B SUBNETTING CHART PLUS#
You know that that will fill the two omitted octets, plus the first one you wrote down, plus the first zero of the last octet, hence 25 bits for the network. Now, start with the first zero on the right and label them with superscript, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, etc. Stop trying to do fancy math and write out 16 zeros on a piece of paper with a dot between the first and last 8. r/CompTIA holds no responsibility for certification nullification which may be caused by visiting links submitted to this subreddit.Īsking for, or posting links to Braindumps, Unauthorized reproduction of testing material, copyrighted material or other content that is in violation of the CompTIA Candidate Agreement will result in removal of post, up to being banned from this community. Note Please be advised that the use of some of the links above may violate CompTIA's certification policies.
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