Question about subnetting on MS Exams

Discussion in 'Microsoft Certification' started by $teve.H, Nov 10, 2005.

  1. $teve.H

    $teve.H Guest

    I'm currently certified as ccna, and when I learnt to subnet, I learnt that
    the 1st and last subnet are not to be used.

    (See for visual example)

    Sitting my 291 tomorrow and it mentions subnetting in my sybex revision
    guide but I cant find any mention to leaving these 2 subnet's out.
    I know these subnets are actually useable, but your not meant to use them
    (please correct me if I'm wrong here! :eek:)

    I know MS have funny quirks where they don't quite follow standards on some
    things, is this one of them?

    $teve.H, Nov 10, 2005
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  2. $teve.H

    Geez31 Guest

    They do recommend leaving the first and last subnet out. I wouldnt lose any
    sleep over subnetting for the 291. There is hardly any questions on this.
    Geez31, Nov 11, 2005
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  3. $teve.H

    $teve.H Guest

    So i found out today:) passed 833.

    one question i had could have been about subnetting, but i think i read
    toomuch into it! =)
    $teve.H, Nov 11, 2005
  4. Afaik even the lastest version of ccna (640-801) states that you can use
    all subnets. Only old really old equipment should have problems with these
    Ole Kristian Bangås, Nov 13, 2005
  5. $teve.H

    $teve.H Guest

    Ole Kristian Bangås wrote...
    Quote from Orignal Post
    "I know these subnets are actually useable, but your not meant to use them"


    I've used subnet zero before, i know all but legacy equipment can use subnet
    zero, but only i've only experianced it when configuring cisco routers,
    never had a great need for subnetting win a windows serve enviroment mainly
    due to NAT/private ip ranges, just wanted to clafify microsofts idea of
    subnet zero, i.e not recomended/safe to use.

    Thanks for the input.
    $teve.H, Nov 19, 2005

  6. Under old-style "Classfull" subnetting, the first as last subnets were
    not used. Older routers had trouble with them. "New" routers don't have
    this issue. Using Varible Length Subnet Masking (VLSM) they are always
    included. Under the Windows Server 2003 exams, Microsoft always assumes
    you are using VLSM and does account for them.
    Robert Coulter, Nov 21, 2005
  7. As with (afaik 640-801). I'm aware of the fact that they were not supposed
    to be used in earlier materials and exams, but both MS and Cisco include
    them now, which was my point.
    Ole Kristian Bangås, Nov 21, 2005
  8., Jan 11, 2006
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