Re: Subnetting question on Sybex Book
anonymous_at_discussions.microsoft.com
Date: 03/19/05
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Date: Sat, 19 Mar 2005 13:36:26 -0800
>If it is indeed a class B address
I'm going to post the complete question with the answers
(I don't think there should be any copyright issue by
copying just a single question). I thought that if you say
the subnet mask is something like 255.255.x.y then you are
implicitly assuming it is a class B network.
Anyway, this is the complete story (hope it doesn't wrap
orribly):
You work for Carpathian Worldwide Enterprises, which has
more than 50 administrative and
manufacturing locations around the world. The size of
these organizations varies greatly, with
the number of computers per location ranging from 15 to
slightly fewer than 1000. The sales
operations use more than 1000 facilities, each of which
contains 2 to 5 computers. Carpathian
is also in merger talks with another large organization;
if the merger materializes as planned, you
will have to accommodate another 100 manufacturing and
administrative locations, each with
a maximum of 600 computers, as well as 2,000 additional
sales facilities. You don't have any
numbers for the future growth of the company, but you are
told to keep growth in mind. You
decide to implement a private addressing plan for the
entire organization. More than half of your
routers don't support Variable Length Subnet Masking. What
subnet masks would work for this
situation? (Choose all that apply.)
A. 255.255.224.0
B. 255.255.240.0
C. 255.255.248.0
D. 255.255.252.0
E. 255.255.254.0
B, C, D. When you add up the locations that currently need
to be given a network address,
the total is 3150, and the maximum number of hosts at any
one of these locations is less that
1000. The subnet masks need to support those requirements.
The subnet masks given in options B,
C, and D will provide the address space to support the
outlined requirements. The subnet
mask 255.255.240.0 supports more than 4000 subnets and
4000 hosts. The subnet mask
255.255.248.0 supports more than 8000 subnets and more
than 2000 hosts. The subnet
mask 255.255.252.0 supports more than 16,000 subnets and
more than 1000 hosts.
Although each of these subnet masks will work, at the rate
that this company is growing,
255.255.252.0 is probably the best mask to prepare for the
future. It's unlikely that there will
ever be more than 1000 hosts on any given network. In
fact, that number would probably cause
performance problems on that subnet. Therefore, it's
better to have more subnets available
to deploy as the company grows.
The subnet mask 255.255.224.0 supports more than 2000
subnets-an insufficient number to
cover the locations. 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.
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