COIT20264 Network Design: Analysis of OZ Dispatch Network

This report provides a comprehensive analysis of the OZ Dispatch network, addressing business and technical goals, constraints, and trade-offs. It includes an examination of user communities, data stores, and network traffic. The logical network design is discussed, along with a network diagram created using Cisco Packet Tracer, and IP addressing and subnet calculations. The report details routing and switching methodologies, security mechanisms, and the physical layout of network components. It also lists the hardware equipment, including specifications and costs, and concludes with test cases and observations. The report follows the top-down network design methodology and includes diagrams and tables to illustrate the network's structure and functionality, offering a detailed overview of the network design process and its implementation.

Running head: STUDY OF OZ DISPATCH NETWORK
Study of OZ Dispatch Network
Name of the Student
Name of the University
Author Note

1STUDY OF OZ DISPATCH NETWORK
Summary
This report aims to analyse the requirements of the network of OZ Dispatch and presents the
various technical and business specific goals while also mentioning the associated
constraints. The report then provides with analysis of user communities through assessing
their requirements in a table that map them with data stores, network connection method and
the respective traffic. After that the logical design gets discussed followed by the logical
network diagram which is drawn using Cisco Packet Tracer software and afterwards the IP
calculation and addressing is discussed. Then this report speaks of routing and switching
methodologies undertaken for implementing the entire network and the physical orientation
and layout of the network components is shown through the physical network diagram. The
hardware equipment required for the network are listed in a table where their names, make,
model and prices as well as the IPs assigned are mentioned along with the net cost. After
explaining the details of the listed network equipment, the test case and test plan documents
are created following which the report ends with observations in the conclusion section.

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Table of Contents
Introduction................................................................................................................................3
OZ Dispatch Network Analysis.................................................................................................3
Scope......................................................................................................................................3
Business oriented goals......................................................................................................3
Technical setup goals.........................................................................................................4
Constraints from business goals.........................................................................................5
Trade-offs from technical goals.........................................................................................5
User Communities..............................................................................................................6
Logical Network Design........................................................................................................7
IP Addressing and Subnet Calculation...............................................................................8
IP Addressing Method - CIDR...............................................................................................8
Routing and Switching Protocols...........................................................................................8
Security Mechanism...............................................................................................................9
Conclusion..................................................................................................................................9
References................................................................................................................................11

3STUDY OF OZ DISPATCH NETWORK
Introduction
The following report analyses the requirements of the network of OZ Dispatch and
presents the various technical and business specific goals while also mentioning the
associated constraints. Then the report then provides with analysis of user communities
through assessing their requirements in a table that map them with data stores, network
connection method and the respective traffic. After that the report moves to logical design
section where the design is discussed and the logical network diagram given which has been
drawn in Cisco Packet Tracer software and afterwards the IP calculation and addressing is
discussed (Noor, Yayao and Sulaiman 2018). Then this report speaks of routing and
switching methodologies undertaken for implementing the entire network and the physical
orientation and layout of the network components is shown through the physical network
diagram. The hardware equipment required for the network are listed in a table where their
names, make, model and prices as well as the IPs assigned are mentioned along with the net
cost (Ye et al. 2018). After explaining the details of the listed network equipment, the test
case and test plan documents are created following which the report ends with observations in
the conclusion section.
OZ Dispatch Network Analysis
Scope
Business oriented goals
OZ Dispatch through the newly proposed network design looks to increase the
generation of revenues. By adding more collection distribution centres (CDC)s they are to
address more customers.

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They also want to rely on the network to reduce the operating costs. Getting rid of
unnecessary physical networking equipment is way of dramatically bringing down the
expenses.
Improving mode of communications is necessary for better co-ordination between the
organization members. Adding features to the web portal and making use of applications to
support video conversations to be of significant help.
Mobility of users of the network is to be ensured to help the company stay in constant
connections with the delivery staff and relay change of actions at any time.
The security of the network is to be established to tackle all cyber threats as well as
intrusion prevention or hijacking of network. Having a centralized security solution for
addressing all security risks can be of immense benefit.
Low ping, less traffic and constant bandwidth is a key element of the network for
sustaining real time activities like VoIP.
Technical setup goals
To sustain the constant expansion of OZ Dispatch, the network is to be scalable enough
and have the ability to support additional branch if required in future as also support the
growing number of users of the portal.
It is extremely important for the network to be available at all branches and hence
employing network administrators for diagnosing and maintenance of networks of all
branches becomes necessary. Availability should be 24/7 as the delivery staff work round the
clock and the company portal are accessed at all times for orders.
Network performance is directly related to the amount of traffic present in the network.
Less traffic is to be ensured for low pings and constant network bandwidth.

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Security of the network is of paramount importance and nothing can address security
specific risks to the network as effectively as corporate firewall devices.
The network of OZ Dispatch is to be adaptable. By comprising of both wired and wireless
networks by means of switches and WLAN controllers (Mansoubi et al. 2016) the network
can extend wireless connections for smartphones as also wired connections for workstations
at all branches.
Constraints from business goals
Relying heavily on wireless connectivity has its share of benefits and disadvantages.
The bandwidth and response times in wireless connections is never as good as direct wired
connections and these are generally more costly to implement but the mobility of network
usage offered outweighs the above drawbacks.
Increase of revenues can come from serving more customers. For this OZ Dispatch
needs to expand but concrete data is required. A miscalculated expansion can result in loss
for the company.
Trade-offs from technical goals
Operating with large networks is expensive and can result in wastage of IP addresses.
However, they can also help address the traffic issues on a network and thus maintain low
response times and effective bandwidth. It also enables seamless addition of extra branches to
the network.
An industry leading physical firewall device is expensive and complex to operate.
These are to require hiring of additional personnel for configuring it. Yet, they provide the
most comprehensive security to a network from cyber security risks as well as penetration
attacks.

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User Communities
User Designation Data Stores Network
Connection
protocol
Traffic
Managing Director Web Server, Mail
Server, Database
Server.
DHCP only 45%
Managers Web Server, Mail
Server, Database
Server.
DHCP only 45%
Operational Staff Web Server, Mail
Server,
Authentication
Server, Database
Server.
Direct connection
and DHCP
45%
Delivery Staff Web Server, Mail
Server, Database
Server.
DHCP only 45%
The communities of users vary among the managing director, managers in CDCs, the
operational level staff and delivery level staff. Operational level personnel include a data
analyst, a marketing and sales executive, an accountant as well as two administrators
configure and diagnose the company network (Ghaniyoun, Heidari and Shakeri 2018). The
director, admins and managers bring their personal laptops to work with. Operational staff get
workstations and servers assigned. All these members as also the delivery level staff have

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smartphones assigned by the company (Tobing 2016). Since a single network is being used,
the traffic for all user communities is the same.
Logical Network Design
Network design of OZ Dispatch is built based on the top down approach where the
company router acquires internet access from an internet service provider (ISP) (Quach,
Thaichon and Jebarajakirthy 2016). From here the network access is provided directly to the
core switch which distributes this connection to switches of the different CDCs and the
Parramatta office (Stern et al. 2015). The lower level switches are concerned with providing
access to the collection distribution centres as also smartphones and personal laptops in
Parramatta office with the help of the WLAN controllers.

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Figure 1: Logical network design
IP Addressing and Subnet Calculation
169.254.108.0/22 is the primary network that OZ Dispatch is using for serving the
Parramatta office as well as the 20 collection distribution centres (Masron et al. 2017). Each
of these 20 CDCs employ 20 delivery staff and a manager. The delivery staff only require IPs
for smartphones while the manager requires an additional IP for working in his personal
laptop. Hence the CDCs alone require 20*20 = 400 + 20*2 = 40 or 440 IP addresses. The
Parramatta office requires 2 connections for the director (personal laptop and smartphone) 6
connections for the three operational staff (workstation and smartphone), 4 for all four servers
and 4 more for the two network administrators (personal laptop and smartphone), totalling 16
connections. Therefore, total IP addresses required by the company are 440 + 16 = 456. For
this a network with 510 assignable IPs are enough (Xiao et al. 2018). Yet, since the company
is expanding, network with 1022 assignable IPs are taken.
IP Addressing Method - CIDR
CIDR or classless inter domain routing is the IP addressing method that replaced the
classful IP Addressing which was inefficient since the IP address classes A, B, C, D and E
(Shirmarz and Sabaei 2016). The difference of IP addresses contained by each class varied
greatly. In CIDR smoother transitions can be made by just changing the CIDR mask value so
that less allocation space is wated in the process.
Routing and Switching Protocols
OZ Dispatch network design simply makes use of top down approach in installing
routers and switches for building the network infrastructure (Lindem et al. 2016). The core
part of the network involves the company router obtaining internet access from the ISPs who

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are in turn connected to servers of all the networks of the internet. The core switch receives
network access from the router and distributes it to respective switches of the Parramatta
office and all the 20 CDCs. These 21 lower level switches are responsible for providing
access to individual devices. The smartphones automatically get IP addresses assigned
through the DHCP protocol and accesses the network via the wireless local area network
(WLAN) controllers (Jacobs, Coder and Musser 2016). IPs are manually allocated to the
interfaces of the router. Filter, flood and forwarding techniques are used for the decision of
adding frames in switch tables so that they get delivered to intended recipients. The physical
network diagram below shows the actual layout of the network. The firewall router, the core
switch all are installed in the Parramatta office. This office also contains all the servers and
workstations (Čabarkapa 2015).
Security Mechanism
The network of OZ Dispatch faces a range of security risks which can be hacking of
networking devices, by interception and modification of data, user credentials getting stolen,
and change of device configuration (Šimon, Huraj and Čerňanský 2015). Other alarming
attacks are denial of service attacks and security risks for spying on the company network.
The firewall device installed near the router not only serves the purpose of a firewall but can
also perform authentication of key parts of the network as well as grant and revoke network
access at specific nodes.
Conclusion
In conclusion this report successfully analyses requirements of the network of OZ
Dispatch and presents the various technical and business specific goals as also mentioning the
associated constraints. It is observed that the report provides with analysis of user
communities by assessing their requirements in a table that map them with data stores,

10STUDY OF OZ DISPATCH NETWORK
network connection method and the respective traffic. After that the report moves to logical
design section where the design is discussed and the logical network diagram given which
has been drawn in Cisco Packet Tracer software and afterwards the IP calculation and
addressing is discussed. Then this report speaks of routing and switching methodologies
undertaken for implementing the entire network and the physical orientation and layout of the
network components is shown through the physical network diagram. The hardware
equipment required for the network are listed in a table where their names, make, model and
prices as well as the IPs assigned are mentioned along with the net cost.

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References
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Ghaniyoun, A., Heidari, M. and Shakeri, K., 2018. Psychological empowerment and its
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and Diagnostic Research, 12(6).
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access points. In 2016 United States National Committee of URSI National Radio Science
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Lagouardat, M., Wine, J.M. and Carre, O., 2017. Intelligent network assets supervision and
control in Enedis. CIRED-Open Access Proceedings Journal, 2017(1), pp.1250-1252.
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for Advertising Optional Router Capabilities (No. RFC 7770).
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Noor, N.M.M., Yayao, N. and Sulaiman, S., 2018. Effectiveness Of Using Cisco Packet
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