Subnetting Question

Discussion in 'MCSE' started by myrt webb, Oct 10, 2003.

  1. myrt webb

    myrt webb Guest

    In a practice problem the question is how to apply IP
    addresses to 3 subnets. In part of the answer it says "The
    address could be used for Subnet A, and
    the address could be used for Subnet B.
    However using those addresses would require that an
    address of or 192.168.96/27 be used for
    Subnet C."

    Subnet A has to accomodate 100 hosts, Subnet B 50 hosts
    and Subnet C 25 hosts.

    I need some help to understand, in the above example, how
    the addresses for A and B dictate the addresses for C.
    myrt webb, Oct 10, 2003
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  2. myrt webb

    asdfasdfa Guest

    hmmm i saw this problem somewhere before...somewhere in
    those cert websites...i forgot the site. oh well.
    asdfasdfa, Oct 10, 2003
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  3. myrt webb

    Herb Martin Guest

    In a practice problem the question is how to apply IP
    They don't necessarily. You have to extrapolate a bit. (And
    you have to notice that the question -- as posed -- has the bits
    working the 4th octet while the differences are shown in the
    3rd octet. It's full of typos.

    25 bits leaves 7 bits, 2^7 = 128 or about 126 hosts max.
    26 bits leaves 6 bits, 2^6 = 64 or about 62 hosts max
    27 bits leaves 5 bits, 2^5 = 32 or about 30 hosts max

    Each subnet MUST begin on a "multiple" of that "power of two"
    it uses, i.e., 128, 64, 32.
    Herb Martin, Oct 10, 2003
  4. play around with the subnet masks.
    Darko Gavrilovic, Oct 12, 2003
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