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CSC00240 Data Communications and Networks, Southern Cross University, Australia

Network Design For A Modern Software Development Company

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Executive Summary: Advanced Medicos Limited is looking out to upgrade the network. While we already have Windows server and Cisco router to manage the operations, the extension of a new branch and new hosts demand better network design and IP architecture. The network design in this paper involves VPN, WAN and cloud based server to ease the quality of service, security and affordability. The IPv4 addressing plan for the firm begins with 172.16.124.1 and allows upto 510 hosts.

Question: Design the network you would recommend.

i. Suggest a type of network architecture that is suitable for the organisation. You will need to identify all the media (circuits), network hardware necessary to build the network(s) you are proposing and to justify your choice, i.e., you will need to explain the function of the hardware and network choice in your solution and to justify your choice by value for money, Quality of Service (QoS), security, etc.

ii. Explain IP address plan for the proposed network

iii. Explain logical network design with diagram(s) for the proposed network.

iv. Draw physical network(s) diagram that shows how you connect the hardware you have chosen in (i).

Answer: Before we design the network design, it is important to note that there are 3 buildings altogether and 2 of them are close by and the third one is a branch office that is located 100kms from the present location.

1. Network design for recommended network

1.1 Data transmission media: We will go ahead with Cisco 4K router which assures at least 100Mbps speed though it is an expensive affair. This needs to be installed in both the buildings. Further, there is a need for VPN in the entire network architecture due to the reason that users need to access from anywhere (Groth and Skandier, 2005). Hence, when users attempt to bring own devices or access company data from a different location, Cisco VPN will be of use. 

Instead of allocating a separate room for servers to store files and databases and also facilitate communication, it is a good idea to go ahead with cloud server. In this case, Amazon Web Server (AWS) will be used. The reason for choosing this cloud based server is that it is affordable, efficient, reliable and secured. The existing Windows Server 2019 is appropriate to facilitate data sharing and communication while the database will continue to exist only in the cloud based server.

1.2 Hardware requirement: For all the workstations, there will be individual ports and based on the number of workstations, we will make use of 24port or 30 port switches (Albert and Barabasi, 2013). The firewall included here will take care of security in addition to the role played by AWS. It is a wireless mesh network followed between the workstations. Physical devices are connected through the cables.

• Processor - Intel Quad Core 8MB

• Storage - at least 8TB capacity

• Server - Windows 2019

• Ethernet of 1000Mb/s

The given structure has scope for addition of new ports and switches. As we have been using Cisco Router, it is appropriate to ahead with Cisco switch that will ensure instant compatibility and safety.

The structure of network that will take care of the operations is presented here.

Network Design Arena.jpg

There are wireless access points for the users to access from anywhere within the premises or from a remote workspace (Stallings, 2004).

1.3 Logical design: There are a total of 3 buildings in the given case. So, the logical design is created for each building separately. 

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Building 1:

Building 1.jpg

Building 2:

Building 2.jpg

New branch:

New Branch.jpg

Physical network design: The network architecture is given below.

Physical Network Design.jpg

IPv4 addressing plan

It is suggested to make use of the IP address range - 172.16.125.0/23

IP subnet and subnet mask

As the TCP/IP protocol is now used to establish link with the server, the subnet mask is set accordingly. It is a class B network.

In the given address range, there are 9 bits and 512 subnets (Antoniou, 2007).

29-2 = 510 hosts

Network address

The network address here is written as:

10101100.00010000.0111110 1.00000000 and the netmask is 11111111.11111111.1111111 0.00000000

Default gateway address

The default gateway address for this network is 172.16.124.1

Broadcast address

The broadcast address here is 172.16.125.25 and this can be written as

10101100.00010000.0111110 1.11111111

Key IP address

While the key IP address is 176.16.25.0 and the wildcard is 0.0.1.255, the range of the host is:

172.16.124.1 - 172.16.125.254

Subnet name

Workstations/

Size required

Available

size

Address

Mask

Assignable

range

Broadcast

Software

Dept

Data

80

126

172.16.125.0

/27

172.16.125.1-172.16.125.126

172.16.125.127

Software dept wireless

80

126

172.16.125.128

/27

172.16.125.129-172.16.125.254

172.16.125.255

Production data

67

126

172.16.84.0

/27

172.16.84.1-172.16.84.126

172.16.84.127

Production

wireless

7

14

172.16.84.224

/30

172.16.84.225- 172.16.84.238

172.16.84.239

Marketing

Data

14

14

172.16.84.192

/30

172.16.84.193-172.16.84.206

172.16.84.207

Marketing wireless

14

14

172.16.84.208

/30

172.16.84.209-172.16.84.222

172.16.84.223

Administration

data

17

30

172.16.84.128

/29

172.16.84.129- 172.16.84.158

172.16.84.159

Administration wireless

17

30

172.16.84.160

/29

172.16.84.161-172.16.84.190

172.16.84.191

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