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Thread: IP Addressing Quiz

  1. #21
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    I just thought of a faster way of binary calculations without doing the entire calculation.

    First you would need this scheme, 128 64 32 16 8 4 2 1

    Let say the number of networks is 15, immediately, I know it 4 bits

    79 networks, 7 bits
    63 networks, 6 bits
    23 networks, 5 bits

    What I am doing is taking the number of networks, 63 for example, then I look at the 128 64 32 16 8 4 2 1 scheme and determine between which two of these does the number of network falls, 63 is between 64 and 32, then I take the lower of the two, which is 32 in this case, 32 is the 5th bit in 128 64 32 16 8 4 2 1 scheme, so therefore 5 bits for 63 networks.

  2. #22
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    Quote Originally Posted by juba
    I just thought of a faster way of binary calculations without doing the entire calculation.

    First you would need this scheme, 128 64 32 16 8 4 2 1

    Let say the number of networks is 15, immediately, I know it 4 bits

    79 networks, 7 bits
    63 networks, 6 bits
    23 networks, 5 bits

    What I am doing is taking the number of networks, 63 for example, then I look at the 128 64 32 16 8 4 2 1 scheme and determine between which two of these does the number of network falls, 63 is between 64 and 32, then I take the lower of the two, which is 32 in this case, 32 is the 5th bit in 128 64 32 16 8 4 2 1 scheme, so therefore 5 bits for 63 networks.
    yeh thats how they taught it to me in my ccna course
    starry heavens above and the moral law within
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    dmitridawkins.com

  3. #23
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    I can see that way is kinda fast still. I'll practise using that one and see if it sticks (it fairly easy so it should stick)
    The trouble with learning from experience
    is that the test comes first and
    the lesson afterwards

  4. #24
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    once you get the hang of it its kinda easy as long as you keep practicing even if its once in awhile.

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