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  1. Member
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    #1

    Default Help answer this question.

    This question is from the Microsoft Training Kit.

    For each address block and internally configured subnet mask, determine the number of available subnets and hosts per subnet.

    Original Address Block: 208.147.66.0 /25
    Internal Configured Subnet Mask: 255.255.255.248
    Number of Available Subnets:
    Number of Available Hosts per Subnet:

    My answers are 16 for Number of Available Subnets and 6 for Number of Available Hosts per Subnet. Although the answers shown in the Training Kit, shows 8 for Number of Available Subnets and 6 for Number of Available Hosts per Subnet. Please let me know which one is the correct answer.

    Thanks,
    rphann
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  3. Artist's impression mikedisd2's Avatar
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    #2
    If it's reserved 5x bits for the subnet, I would have thought that gave 32x subnets with 2^8-2 hosts.

    Subnetting isn't my strong point though.
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  4. Junior Member
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    #3
    Edit

    http://support.microsoft.com/kb/917983

    Page 2-66: Number of available subnets incorrect
    On page 2-66, in Lesson 3, Practice, Exercise 2 answer block, the last line reads:

    "208.147.66.0/25 255.255.255.248 8 6"

    It should read:

    "208.147.66.0/25 255.255.255.248 16 6"
    Last edited by breaker; 09-09-2009 at 02:28 PM.
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  5. Artist's impression mikedisd2's Avatar
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    #4
    Bugger, I knew I sucked at subnetting.
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  6. Junior Member
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    #5
    Quote Originally Posted by mikedisd2 View Post
    If it's reserved 5x bits for the subnet, I would have thought that gave 32x subnets with 2^8-2 hosts.

    Subnetting isn't my strong point though.
    If the mask is /25 then it leaves you with 7 bits

    the new internal mask of 248 is /29

    so your are using 4 for network and 3 for host

    2^4 = 16
    and
    2^3-2 = 6
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  7. Member
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    #6
    Thanks, Breaker.

    So my answer is correct. Thanks for clarifying this for me.

    rphann
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