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4840 Views 4 Replies Latest reply: Mar 19, 2012 11:13 PM by RG_WB RSS

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Network ID or Subnet ID

Mar 22, 2013 2:06 PM

Gav 2 posts since
Nov 14, 2011

Hi Everybody,

 

I have a really daft question for you all.

 

I have just taught myself subnetting which I am fine with, but whilst practicing on various questions I see the answers refering to both Network ID and Subnet ID.  Are these two terms interchangable or Is there a difference, if so what is it?

 

Many Thanks

  • Stephen 488 posts since
    Apr 22, 2011
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    1. Mar 19, 2012 10:51 AM (in response to Gav)
    Re: Network ID or Subnet ID

    In the real world, people use them interchangably (this is the way I've always looked at it).  I guess the real definition comes in where you talk about classful and classless networking (as this is where CIDR/subnetting was involved).  So a class C 192.168.0.0/24 address would be a network.  If we were to subnet it, lets say we want to have 8 subnets, we would have

     

    192.168.0.0/27

    192.168.0.32/27

    192.168.0.64/27

    192.168.0.96/27

    etc...to

    192.168.0.224/27

     

    Each of these subnets would be part of the major classful network of 192.168.0.0/24.

     

    But the word subnet and network are used interchangably

  • Martin 13,070 posts since
    Jan 16, 2009
    Currently Being Moderated
    2. Mar 19, 2012 2:41 PM (in response to Stephen)
    Re: Network ID or Subnet ID

    I agree, but I would use terms properly for exam study and during exam.

    Address could have 3 parts if subnetted: network, subnet, host portions.

  • RG_WB 58 posts since
    Nov 19, 2009
    Currently Being Moderated
    4. Mar 19, 2012 11:13 PM (in response to Gav)
    Re: Network ID or Subnet ID

    What's up GAV,

     

    In support of Stephen's and Martin's answers and for your exam terminology reference,  CH 12 pg 263, 640-822 OCG  3rd ed. The key topic says subnet number is also called subnet ID or subnet address...numerically the smallest number in the subnet and cannot be used by a host,  just as Stephen pointed out

     

    192.168.0.0/27

    192.168.0.32/27

    and so on...

     

    with .0 and .32 being the subnet ID

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