Subnet question...

Discussion in 'MCSE' started by Cory Dunkle, Sep 1, 2004.

  1. Cory Dunkle

    Cory Dunkle Guest

    Trying to get back on the ball towards my certification... Thanks for any
    help you guys can offer.

    Why can a DHCP scope with a starting address of 172.41.48.1 not have a 19
    bit subnet mask?

    Cory
     
    Cory Dunkle, Sep 1, 2004
    #1
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  2. Cory Dunkle

    Andy Foster Guest

    "Cory Dunkle" <> wrote in message
    news:...
    > Trying to get back on the ball towards my certification... Thanks for any
    > help you guys can offer.
    >
    > Why can a DHCP scope with a starting address of 172.41.48.1 not have a 19
    > bit subnet mask?
    >


    172.41.48.1 /19 would be in the subnet 172.41.32.1 - 172.41.63.255 half of
    which isn't yours.
    /19 gives you 19 bits for the network, 13 bits for hosts, giving network
    increments of 32.0 (2^5 * 2^8)
    e.g. 172.41.0.0, 172.41.32.0, 172.41.64.0, 172.41.96.0, etc.
    You need at least /20 (20 bits for the network, 12 bits for the host)giving
    network increments of 16.0 (2^4 * 2^8)

    If this is as clear as mud, try learntosubnet.com
     
    Andy Foster, Sep 1, 2004
    #2
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  3. Cory Dunkle

    Cory Dunkle Guest

    "Andy Foster" <> wrote in message
    news:...
    > "Cory Dunkle" <> wrote in message
    > news:...
    > > Trying to get back on the ball towards my certification... Thanks for

    any
    > > help you guys can offer.
    > >
    > > Why can a DHCP scope with a starting address of 172.41.48.1 not have a

    19
    > > bit subnet mask?
    > >

    >
    > 172.41.48.1 /19 would be in the subnet 172.41.32.1 - 172.41.63.255 half of
    > which isn't yours.
    > /19 gives you 19 bits for the network, 13 bits for hosts, giving network
    > increments of 32.0 (2^5 * 2^8)
    > e.g. 172.41.0.0, 172.41.32.0, 172.41.64.0, 172.41.96.0, etc.
    > You need at least /20 (20 bits for the network, 12 bits for the

    host)giving
    > network increments of 16.0 (2^4 * 2^8)
    >
    > If this is as clear as mud, try learntosubnet.com


    Thanks Andy. I can't believe I didn't see that myself. I must be getting too
    tired... I think I'm gonna play some Doom 3 and go to sleep!

    Cory
     
    Cory Dunkle, Sep 1, 2004
    #3
  4. Cory Dunkle

    Ben Guest

    "Andy Foster" <> wrote in message
    news:...
    >
    > 172.41.48.1 /19 would be in the subnet 172.41.32.1 - 172.41.63.255 half of
    > which isn't yours.
    > /19 gives you 19 bits for the network, 13 bits for hosts, giving network
    > increments of 32.0 (2^5 * 2^8)
    > e.g. 172.41.0.0, 172.41.32.0, 172.41.64.0, 172.41.96.0, etc.
    > You need at least /20 (20 bits for the network, 12 bits for the

    host)giving
    > network increments of 16.0 (2^4 * 2^8)
    >
    > If this is as clear as mud, try learntosubnet.com
    >
    >


    I have to say www.learntosubnet.com is a great site! Thanks for posting this
    link.

    I have my 70-215 exam next week and I hope to be taking 70-218 & 70-214
    soon, and subnetting is the one topic I'm finding difficult to master.
    However I'm going through the videos on that site, and its a great help.
    Very easy to understand!

    Thanks

    Ben
     
    Ben, Sep 1, 2004
    #4
  5. Cory Dunkle

    Consultant Guest

    i say forget subnetting altogether and just play doom!

    "Cory Dunkle" <> wrote in message
    news:...
    > "Andy Foster" <> wrote in message
    > news:...
    > > "Cory Dunkle" <> wrote in message
    > > news:...
    > > > Trying to get back on the ball towards my certification... Thanks for

    > any
    > > > help you guys can offer.
    > > >
    > > > Why can a DHCP scope with a starting address of 172.41.48.1 not have a

    > 19
    > > > bit subnet mask?
    > > >

    > >
    > > 172.41.48.1 /19 would be in the subnet 172.41.32.1 - 172.41.63.255 half

    of
    > > which isn't yours.
    > > /19 gives you 19 bits for the network, 13 bits for hosts, giving network
    > > increments of 32.0 (2^5 * 2^8)
    > > e.g. 172.41.0.0, 172.41.32.0, 172.41.64.0, 172.41.96.0, etc.
    > > You need at least /20 (20 bits for the network, 12 bits for the

    > host)giving
    > > network increments of 16.0 (2^4 * 2^8)
    > >
    > > If this is as clear as mud, try learntosubnet.com

    >
    > Thanks Andy. I can't believe I didn't see that myself. I must be getting

    too
    > tired... I think I'm gonna play some Doom 3 and go to sleep!
    >
    > Cory
    >
    >
     
    Consultant, Sep 1, 2004
    #5
  6. Cory Dunkle

    Neil Guest

    babbling on and on again "Consultant" <> spewed
    in news::

    > i say forget subnetting altogether and just play doom!


    high scores are so impressive one resumes

    --
    Neil MCNGP #30
    the "curious" hair on the soap of society
     
    Neil, Sep 1, 2004
    #6
  7. Cory Dunkle

    Consultant Guest

    totally dood

    "Neil" <> wrote in message
    news:Xns9557ADE7E79F9neilmcsehotmailcom@207.46.248.16...
    > babbling on and on again "Consultant" <> spewed
    > in news::
    >
    > > i say forget subnetting altogether and just play doom!

    >
    > high scores are so impressive one resumes
    >
    > --
    > Neil MCNGP #30
    > the "curious" hair on the soap of society
     
    Consultant, Sep 1, 2004
    #7
  8. Cory Dunkle

    Neil Guest

    babbling on and on again "Consultant" <> spewed
    in news:#:

    >
    > totally dood


    so like I have top standing on UT and like am in 4th with my team for
    capture the flag and we are like going to fragapalooza this year and like
    should ROCK there...

    --
    Neil MCNGP #30
    the "curious" hair on the soap of society
     
    Neil, Sep 2, 2004
    #8
  9. Cory Dunkle

    Consultant Guest

    awesome! im more of a tribes player though

    "Neil" <> wrote in message
    news:Xns9557D71956D8Eneilmcsehotmailcom@207.46.248.16...
    > babbling on and on again "Consultant" <> spewed
    > in news:#:
    >
    > >
    > > totally dood

    >
    > so like I have top standing on UT and like am in 4th with my team for
    > capture the flag and we are like going to fragapalooza this year and like
    > should ROCK there...
    >
    > --
    > Neil MCNGP #30
    > the "curious" hair on the soap of society
     
    Consultant, Sep 2, 2004
    #9
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