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IP addressing

Discussion in 'Network Infrastructure' started by Big_nath, Mar 10, 2009.

  1. Big_nath

    Big_nath Kilobyte Poster

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    Hi,
    I'm studying for the 291 exam, and going over IP address classes. I think i have it.

    But at my place of work the address range we use is 10.128.72.1 - 10.128.73.254 with 255.255.254.0. Should we not be using Class C addressing?

    or am i missing something?
     
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  2. Qs

    Qs Semi-Honorary Member Gold Member

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    You're missing something.

    Just because an IP address range is a certain class doesn't mean that you have to use a certain subnet mask.

    By using a different class of subnet mask you merely restrict the amount of available host IP addresses on the subnet.

    This recent thread may help you.

    If you have any specific questions then PM me.

    Qs
     
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  3. Big_nath

    Big_nath Kilobyte Poster

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    The private IP addresses defined are as follows:
    ● Class A private IP addresses 10.0.0.0 through 10.255.255.255
    ● Class B private IP addresses 172.16.0.0 through 172.31.255.255
    ● Class C private IP addresses 192.168.0.0 through 192.168.255.255

    The above is for the text book. the reason i say we should have class C is because of the number of addresses we require. would it not be better practice to have used 192.168. address?
     
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  4. Qs

    Qs Semi-Honorary Member Gold Member

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    The text-book is just trying to keep it simple. In the real world you can specify different masks to restrict the amount of IP addresses on a subnet.

    ...If you want me to be really vague, but pretty honest - you don't need to worry about it for your exam. Just stay in the blissful ignorance that Class A IP addresses only have a Class A subnet mask etc etc etc :p

    Else, PM me and I'll explain further if you're curious.

    Qs
     
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  5. craigie

    craigie Terabyte Poster

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    They could be using the range for future proofing for expansion, or they may have multiple subnets that perhaps you are not aware of.

    Or it could be they just like the number 10 alot :D
     
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  6. Big_nath

    Big_nath Kilobyte Poster

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    cheers guys. any links or books anyone can recommend to help me get a better grip on this area.
     
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  7. danielno8

    danielno8 Gigabyte Poster

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    TRY THIS

    If you goodle VLSM you will find a ton of information out there.
     
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  8. Qs

    Qs Semi-Honorary Member Gold Member

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  9. Arroryn
    Honorary Member

    Arroryn we're all dooooooomed

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  10. Qs

    Qs Semi-Honorary Member Gold Member

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    ...but, but that's CCNA stuff and CCNA qualified people are eeeevil. :p
     
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  11. Big_nath

    Big_nath Kilobyte Poster

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    cheers guys i'll take a look when work calms down abit.
     
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  12. Arroryn
    Honorary Member

    Arroryn we're all dooooooomed

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    I admire the open way you can describe yourself, Qs.

    But srsly, those vids are excellent.
     
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  13. Qs

    Qs Semi-Honorary Member Gold Member

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    O deffo srsly! :p
     
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  14. Crito

    Crito Banned

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  15. Big_nath

    Big_nath Kilobyte Poster

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  16. BosonMichael
    Highly Decorated Member Award

    BosonMichael Yottabyte Poster

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    yarly!
     
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