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VLSM Notation Help...

Discussion in 'Network Infrastructure' started by daft_togger, Aug 23, 2009.

  1. daft_togger

    daft_togger Nibble Poster

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    Can anyone help please, from pages 2-35 and 2-36 of the ms press book, I for the life of me can't understand the example subnet addresses, specifically the notation of the ip address with what looks like 5 octets 208.147.66.0.0/25

    I completely understand the message from using VLSM, however do not understand why MS has show the address space in this way......something about trailing 0s in the subnet id and I'm not sure I understand the "to prevent overlapping"

    Any help would be appreciated, this is only covered over 2 pages, but I do not want to be moving on too much while I do not understand something.

    O and I did ask my teams 2 best networking guys, and they are not sure either.
     
    Certifications: 70-290, 70-620
    WIP: 70-291
  2. albertc30

    albertc30 Kilobyte Poster

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    Try and look for an errata mate as I bet my money that is a printout error.
    As I understand you don't have a 40bit long IP addresses.
    IPv4 is 32bit / 4byte and IPv6 is 128bit / 16 bytes long.
    So that is an error most likely.
    Hope it helps
     
    Certifications: CCNA
    WIP: 220-701 - A+
  3. zebulebu

    zebulebu Terabyte Poster

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    Yeah, Albert's right - that's a typo.

    Address should probably be 208.147.66.0/25

    If you're not completely familiar with the concepts behind IP addressing, I can understand how typos could be confusing!
     
    Certifications: A few
    WIP: None - f*** 'em
  4. daft_togger

    daft_togger Nibble Poster

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    Well that makes sense my not getting it, and that of my work mates.....but this is shocking to have mistakes like this in ms press book. They also show this same notation on diagrams on page 2-23.

    I did some google searches on VLSM and I've not seen it anywhere else.

    Cheers Guys
     
    Certifications: 70-290, 70-620
    WIP: 70-291
  5. zebulebu

    zebulebu Terabyte Poster

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    LOL - get used to it!
     
    Certifications: A few
    WIP: None - f*** 'em

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