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Subnetting question

Discussion in 'Networking & Security' started by mab1376, Mar 22, 2011.

  1. mab1376

    mab1376

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    My colleague are cramming for our CCNA and for some reason one subnet example is for the network 192.168.10.0 255.255.255.224 and it shows only 6 valid subnets for Class C.

    Based on what I know, there should be 8, the book doesn't recognize the subnets 192.168.10.0-192.168.10.31 or the network 192.168.10.224-192.168.10.255

    (low numbers being network address and high number being broadcast address.)

    Does that seem right?
     
  2. exodusprime1337

    exodusprime1337

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    mab1376 says thanks.
  3. exodusprime1337

    exodusprime1337

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    bare in mind that each class c subnet has 2 values you cannot use.
     
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  4. mab1376

    mab1376

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    According to the link its the same example but with the other addresses that the book is missing.

    i.e. the 0 and 224 network addresses
     
  5. Hybrid_theory

    Hybrid_theory

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    The 0 - .31 and 224 - 255 are referring to old technology. Years ago those subnets would not be usable. But that has been fixed in current router technologies and they are now usable

    Any other questions, feel free to ask. I've taken 4 CCNA courses.

    Also a tip for easy host figuring outness (class C only).

    for the mask 255.255.255.224 or /28. In the last subnet you have 11100000

    Take the value of the last bit that is on so: 11(1) and whats its value? 32. 32-2 = 30.
     
    Last edited: Mar 22, 2011
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  6. mab1376

    mab1376

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    Great thanks!

    That's exactly the info I was looking for.
     

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