Logical Network Design for OZ Dispatch IT Services

ASSESSMENT1
OZ Dispatch IT Services
Logical Network Design
By
NIDHI A PATEL
Student ID:12076996
RUHILA I VAHORA
Student ID:12067716
BIREN G PATEL
Student ID: 12067937
SHIVAM CHAUHAN
Student ID:12078765

List of Business Goals and Constraints
According to LeBlanc, a good network design should recognize the fact that client’s requirements
exemplify a lot of technical and business goals. These include but not limited to scalability, availability,
security, affordability and manageability. Clients also need to specify a required level of network
performance also known as service level (LeBlanc, et al., 2015). OZ Dispatch is not an exception. It
requires the above mentioned requirements and meet these requirements, top-down technique will be
deployed. That is to say, the network design will be made by designing the upper layers of OSI reference
model first before moving lower layers. This kind of design pays attention on applications, the sessions
and information transport before choice of switches, media and routers that operate at other lower
layers. Below is a list of business goals for OZ Dispatch
i. Deliver the parcel to the customer
ii. Collect the parcel from suppliers
iii. Pay via phone and
iv. Working remotely form the DC centre
Business constraints denotes to the limitations which can either be physical, fiscal time limitations which
affects the achievement of a business goal. For OZ Dispatch Company, below are the possible business
constraints.
i. Security – it is challenging develop a security system for mobile and web funds transfer.
ii. Collection of parcels from the supplier will require some funding which may be a business
constraint.
List of Technical Goals and Tradeoffs
Analysing client’s technical goals helps the network engineer confidently give recommendations on
technologies which will perform client’s expectations. Below is a list of technical goals for OZ Dispatch
Company:
i. Availability
This is the time percentage when the system is available. Our subject company cannot afford to be
offline since tracking of luggage is done on 24/7. This implies that we must have a redundancy systems
that will minimize the rates of down times.
ii. Security
iii. Scalability

Scalability is a factor that determines the capability of a network design to adapt growth. This factor
puts in consideration the downsizing factor. OZ Dispatch network design will allow future growth and
relocation of devices.
iv. Performance
v. Adaptability and affordability
vi. Security
Mariño says, in a decision making process, there is a need to trade off one item against another. Trade-
off comprises of a sacrifice that has to be made in order to get a particular experience or product.
Despite the fact that network engineers make a lot of promises to customers during the initial stages in
network implementations, in ideal world meeting goals need making of trade-offs (Mariño, 2016). For
OZ Dispatch Company, to meet expectations for availability, redundant items are necessary, this implies
there is a raise in cost of network implementation. To meet the required performance, high-cost circuits
and components are required. Deployment of effective throughput for one application may cause
delayed problems of another program.
Table of User Communities, Data Stores, Network Applications and Traffic Flows
User community denotes to the set of employees of an organization who use a certain application or a
number of applications, below is the table of user communities, data stores, traffic flows and network
applications for our subject company;
Name of
Application
Type of Traffic
Flow
Protocol(s) used by
Application
Data
Stores
Approximate
Bandwidth
Requirements
(Kb)
QoS
Requirements
E-mail Client/Server SMTP Server,
host pcs
10 Low
Web
browsing
Client/Server HTTP,HTTPS server 60 Low
Database
update
Server/Server CDN Server 100000 High
File
transfers
Peer/Peer FTP Server,
host pc
100 Medium
File sharing Peer/Peer FTP Host pcs 100 Medium