NW421 Network Design and Analysis Case Study: Chapter 3

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Oct 27, 2013 (3 years and 7 months ago)


NW421R2 Network Design and Analysis

Chapter 3
Case Study and Discussion V1.0

©2004 Westwood College

Page 1 of 2

Modified: 03/19/2004

NW421 Network Design and Analysis

Case Study: Chapter 3

Introduction: Case Study

The following case study is about a conjured benefits administration company,

Option One, Inc. This same case study is used throughout the remainder of the

course in order

to continually evaluate your understanding of the concepts presented

at the end of selected chapters.

The purpose of this case study is to provide an opportunity to practice what has been

learned and to make use of the topics that has been presented.

e Study General Instructions

Your job will be to act as a network consultant tasked with designing a network

solution that addresses Option One’s requirement outlined under section
Case Study


Use the information and parameters provided within the ca
se study to formulate

answers to the tasks below. If ambiguities are encountered, make reasonable

documented assumptions and proceed.

Any and all reference material is permissible to formulate answers to the case study

task i.e. notes, books, white papers
, etc.

The final goal for each case study task is a paper solution. You are not required to

provide specific product names and/or vendors. However you may include basic cost

estimates where applicable.

Case Study: Option One, Inc

This case study involves

analyzing the network of Option One, Inc. The company has

provided you with a short description of its current situation and future plans. As a

network consultant, it is your task to comprehend the requirements and provide a

design that addresses the cust
omer’s goals.

Current Design: Option One, Inc

Bridge X

Bridge X

Bridge 1

Bridge 0


10th Floor

Floors 1

Other Floors

Company Background

Option One, Inc is a benefits administration company that has 10 sites throughout

the United States in major
metropolitan areas including Denver, LA, Chicago, NY

City, San Francisco, Dallas, Atlanta, Miami, Seattle, and DC. Each site has the same

layout, shown in the diagram above with approximately the same number of

employees per site (between 40 and 55). Optio
n one leases all of their buildings

which contain 10 floors and a basement. Workers in the buildings use PCs primarily

to do word processing, database access, and e
mail. The database is primarily ASCII

text in nature. TCP/IP and IPX are used as the networ
k protocol; the addresses are

manually administered. The company is using an arbitrarily selected Class B address

NW421R2 Network Design and Analysis

Chapter 3
Case Study and Discussion V1.0

©2004 Westwood College

Page 1 of 2

Modified: 03/19/2004

and is not connected to the Internet.

Current Network

Each floor has between 35 and 50 Windows 95 PCs and four to five servers

connected via
10Base5 Ethernet. The servers on the floors run either Novell Netware

or Windows NT and are accessed only by users on that floor. There are also 10

servers in the basement running a mix of Novell and NT, which are accessed by all

users in the building. All

floors are connected by bridges to the basement. The

individual sites are not currently connected to each other. Any communication that

must occur between sites is done via telephone (voice), conventional mail, or

overnight express service.

Each PC genera
tes about 100 kbps of traffic. Most of the traffic (about 90%) is for

the local servers; 10% is for a shared server in the basement.

Network Requirements

Option One is experiencing extensive growth. It anticipates that there will be up to

100 user PCs and

10 servers per floor. In addition, the company is performing

application upgrades. These new packages will do much more graphical presentation

of data. Option One is finding that the addition of more users and newer applications

is resulting in severe acc
performance problems in its network. It also sees a

need to interconnect the major sites, anticipating that 10% of the traffic from each

building will go to some other building. In addition, Option One would like to start

doing Internet based transacti
ons with many of its customers and business partners

therefore adding additional web based applications and protocols including SSL,

HTTP, HTTPS, and FTP. These applications must be secured, reliable and exhibit

minimal downtime. Future company growth is e
xpected to result in more sites being

added, up to a maximum of 30, with the same end
user requirements within five to

ten years.

Case Study Task: Identify the Customers Needs


Formulate answers for the following requirements of Option One, Inc.


what the critical applications for Option One are.


What are some business goals that can be ascertained from Option One?


Do you see any technical constraints that might affect Option One’s network


requirements? If so, what are they?


Characterize the existi
ng network. Is there anything that stands out about the




Identify and document the scope of the project.