Re: Subnetting question on Sybex Book

From: blastingfonda (blastingfonda_at_gmail.com)
Date: 03/19/05

  • Next message: anonymous_at_discussions.microsoft.com: "Re: Subnetting question on Sybex Book" 
    Date: 19 Mar 2005 12:53:57 -0800

    If it is indeed a class B address, your subnetting is correct - 64 subs
    and 1024 hosts for the first subnet, 128 subs and 512 hosts for the
    second. If the original address is a class A address (with a default
    subnet mask of 255.0.0.0), it then does indeed come out to 2^14 or
    16,384 subnets for the first address and 2^15 or 32,768 subnets for the
    second.

    It's all depenendent on what the original address / class you are
    subnetting is as stated in the question.

    I've seen plenty of mistakes in all of these prep books, particularly
    in the sample tests / Q & A sections. Very frustrating to say the least
    but sometimes you just have to shake your head and move on to the next
    question.

    anonymous@discussions.microsoft.com wrote:
    > Now, I thought I had understood how subnetting works
    > before reading this question and related explanation. I
    > would have thought:
    >
    > 255.255.252.0 = 64 subs / 1024 hosts
    > 255.255.254.0 = 128 subs / 512 hosts

    > Is there something wrong with the book or am I missing
    > something ?
    >
    > Thank you.

    anonymous@discussions.microsoft.com wrote:
    > I hope this is the right place for this sort of things:
    >
    > I'm reading the Sybex Book "Server 2003 Network
    > Infrastructure Implementation, Management, and Maintenance
    > Study Guide" for the exam 70-291.
    >
    > I thought that I had a basic grasp of subnetting until I
    > got to question 8 on pag. 71 (for those who have a copy).
    >
    > Basically, the explanation says the following things,
    > among others:
    >
    > Start Quote:
    >
    > The subnet mask 255.255.252.0 supports more than 16,000
    > subnets and more than 1000 hosts.
    >
    > The subnet mask 255.255.254.0 supports more than 32,000
    > subnets but only 500 hosts per subnet, which are not
    > enough hosts to cover all the locations.
    >
    > End Quote
    >
    > Now, I thought I had understood how subnetting works
    > before reading this question and related explanation. I
    > would have thought:
    >
    > 255.255.252.0 = 64 subs / 1024 hosts
    > 255.255.254.0 = 128 subs / 512 hosts
    >
    > Since we are talking about a class B network, how is that
    > supposed to hold 16 Ml hosts ?
    >
    > Is there something wrong with the book or am I missing
    > something ?
    >
    > Thank you.

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