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Custom Subnetting help plleeeaase

Discussion in 'General Microsoft Certifications' started by Methodman85, Aug 21, 2008.

  1. Methodman85

    Methodman85 Byte Poster

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    Hey Guys,

    Already a bit stuck lol.
    I was doing fine up until I came accross a class A IP scheme using what looks to me like a class B masking scheme (Based on the second octet being populated in the network ID).

    Network ID: 10.252.0.0
    Minimum subnet hosts required: 400
    Minimum networks required: 100

    Custom Subnet Mask 255.255.254.0
    Maximum Hosts Per Subnet 510
    Maximum Subnets 32768
    Subnet IDs

    10.252.0.0
    10.252.2.0
    10.252.4.0
    10.252.6.0
    ---
    10.252.254.0 <-------- I'm fine up until here.

    But then the host rangers screw me up.

    Host ID Ranges

    10.252.0.1 – 10.0.1.254 <--- What exactly happens here, why does the 252 get replaced with a zero as an acceptable host range? With a mask of 255.255.0.0 can't we only use the 3rd and fourth octet? Perhaps this is where my error is. Should I be treating this question as a class A?

    10.252.2.1 – 10.0.3.254
    10.252.4.1 – 10.0.5.254
    10.252.6.1 – 10.0.7.254

    10.252.254.1 – 10.252.255.254
     
    Certifications: MCTS, MCSE, MCSA:M, CCNA, MCDST, N+
    WIP: 70-680
  2. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Looks like a set of typos to me. Perhaps some cut'n'paste that got overlooked.
    Now that line is believable!

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  3. Methodman85

    Methodman85 Byte Poster

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    Lol I hope you're right, cause then I can move on!
    This is a publicly posted exercise from a trusted vendor though, seems strange that it would just be wrong.
     
    Certifications: MCTS, MCSE, MCSA:M, CCNA, MCDST, N+
    WIP: 70-680
  4. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Why not drop them a line about it?

    Can you post a link?

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  5. kevicho

    kevicho Gigabyte Poster

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    Once you reach 10.252.255.254 it would have to increment the number before it for the next network

    ie 10.253.0.0 (or 1 for 1st host address) etc.
     
    Certifications: A+, Net+, MCSA Server 2003, 2008, Windows XP & 7 , ITIL V3 Foundation
    WIP: CCNA Renewal
  6. Methodman85

    Methodman85 Byte Poster

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    I don't know if I'm breaking any rules here. But it's on nuggetlab.com, which is free and open to the public.
    http://www.nuggetlab.com/server_2003/291.zip
    That's the zip file that contains subnetting exercises.

    Sorry if I've violated anything, I'll remove this post if I have.
     
    Certifications: MCTS, MCSE, MCSA:M, CCNA, MCDST, N+
    WIP: 70-680
  7. Qs

    Qs Semi-Honorary Member Gold Member

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    Don't believe you have matey. Just breathe.....

    breeeaaathhheee. :p

    I'm sure the OP will appreciate the link.

    Qs
     
    Certifications: MCT, MCSE: Private Cloud, MCSA (2008), MCITP: EA, MCITP: SA, MCSE: 2003, MCSA: 2003, MCITP: EDA7, MCITP: EDST7, MCITP: EST Vista, MCTS: Exh 2010, MCTS:ServerVirt, MCTS: SCCM07 & SCCM2012, MCTS: SCOM07, MCTS: Win7Conf, MCTS: VistaConf, MCDST, MCP, MBCS, HND: Applied IT, ITIL v3: Foundation, CCA
  8. kevicho

    kevicho Gigabyte Poster

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    Just typos those networks are impossible lol
     
    Certifications: A+, Net+, MCSA Server 2003, 2008, Windows XP & 7 , ITIL V3 Foundation
    WIP: CCNA Renewal
  9. Methodman85

    Methodman85 Byte Poster

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    The 10.252.254.1 – 10.252.255.254 in this excercise represents the last possible subnet and the last possible range for that subnet.

    What happens before that is what I don't get, how do you go from 10.252, to 10.0?
     
    Certifications: MCTS, MCSE, MCSA:M, CCNA, MCDST, N+
    WIP: 70-680
  10. Methodman85

    Methodman85 Byte Poster

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    lol what a Relief, I've been thinking myself in circles for the past hour.
     
    Certifications: MCTS, MCSE, MCSA:M, CCNA, MCDST, N+
    WIP: 70-680
  11. Methodman85

    Methodman85 Byte Poster

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    Lol thanks Qs
     
    Certifications: MCTS, MCSE, MCSA:M, CCNA, MCDST, N+
    WIP: 70-680
  12. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    You don't.

    replace the second octet of '0' with 252.

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  13. Qs

    Qs Semi-Honorary Member Gold Member

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    Read the comprehensive guide here and hopefully it will help. :p

    You think this is bad?... wait till VLSM...
     
    Certifications: MCT, MCSE: Private Cloud, MCSA (2008), MCITP: EA, MCITP: SA, MCSE: 2003, MCSA: 2003, MCITP: EDA7, MCITP: EDST7, MCITP: EST Vista, MCTS: Exh 2010, MCTS:ServerVirt, MCTS: SCCM07 & SCCM2012, MCTS: SCOM07, MCTS: Win7Conf, MCTS: VistaConf, MCDST, MCP, MBCS, HND: Applied IT, ITIL v3: Foundation, CCA
  14. Methodman85

    Methodman85 Byte Poster

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    Awesome thanks guys.
    Lol this stuff wasn't that bad, only the typos, figured the lab was posted ages ago so any errors would of been pointed out and corrected. So i figured it had to be right, and that my thinking wrong.
    VLSM eh... that does sound scary :biggrin
     
    Certifications: MCTS, MCSE, MCSA:M, CCNA, MCDST, N+
    WIP: 70-680

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