Network Architecture Report for Telstra Corporation: ITNE1001

This report provides a comprehensive network architecture design for Telstra Corporation's new office in Perth, Australia. It begins with a background of the organization and then details the network design, including a floor plan accommodating six departments across five floors. The report outlines the IP addressing scheme, subnet allocation, and the use of DHCP for device IP assignment. It specifies the devices used, such as Cisco routers, switches, servers, and wireless access points, along with the Cat 6 cabling. A detailed cost analysis is presented, including development and operational costs, alongside an estimation of benefits, demonstrating a positive return on investment within five years. The report concludes with a bibliography of relevant sources.

Running head: NETWORK ARCHITECTURE
ITNE1001 Network Architecture
Student Name:
University Name:

1NETWORK ARCHITECTURE
Table of Contents
1. Background of the organization...................................................................................................2
2. Network design and floor plan....................................................................................................2
3. IP addresses and subnets..............................................................................................................3
4. Used devices and cable types......................................................................................................5
5. Cost analysis................................................................................................................................6
Bibliography..................................................................................................................................10

2NETWORK ARCHITECTURE
1. Background of the organization
Telstra Corporation is a renowned organization in telecommunications as well as media
in Australia. It is associated with developing and operating in telecommunication networks along
with providing internet access, mobile and various other products as well as services for
entertainment. The organization is considered as one of the largest company related to
telecommunications. In the past few years, there has been a tremendous growth in their business
and hence it has acquired a building in Perth, Australia to open a new office for expanding their
network. There are various departments required for running the organization however only six
departments will be accommodated in the new building. Hence, this report is focused on
providing a suitable network design for the new office of Telstra Corporation to meet increasing
demand of the organization. Further, the description of the IP addresses and subnets that will be
allocated for the devices is also presented along with devices and cabling requirements.
2. Network design and floor plan
The network design for Telstra Corporation that has been presented below reflects that
there are overall five floors in which the six departments will be accommodated. The floor plan
has been prepared as such that sales and marketing department will be in first floor and the other
departments will have independent floors for particular department. The network design
illustrates that each floor will have a separate router connected to the central router in which ISP
(Internet Service Provider) will provide internet access. Further, a wireless access point will be
dedicated to each department in the building. The server room will be situated on fifth floor
along with Information technology department.

3NETWORK ARCHITECTURE
Figure 1: Network design for Telstra Corporation
(Source: Created by Author)
3. IP addresses and subnets
A simple addressing solution will be followed for allocating IP addresses to the devices
required for the organization. The solution for IP address allocation that has been designed for
the network of Telstra Corporation is presented below:
Major Network: 10.0.0.0/23
Available IP addresses in major network: 510
Number of IP addresses needed: 230
Available IP addresses in allocated subnets: 276

4NETWORK ARCHITECTURE
About 56% of available major network address space is used
About 83% of subnetted network address space is used
Subnet
Name
Neede
d Size
Allocate
d Size
Address Mas
k
Dec Mask Assignabl
e Range
Broadcas
t
Sales 60 62 10.0.0.0 /26 255.255.255.19
2
10.0.0.1 -
10.0.0.62
10.0.0.63
Informatio
n
technology
50 62 10.0.0.64 /26 255.255.255.19
2
10.0.0.65 -
10.0.0.126
10.0.0.12
7
Marketing 50 62 10.0.0.12
8
/26 255.255.255.19
2
10.0.0.129
-
10.0.0.190
10.0.0.19
1
Research 30 30 10.0.0.19
2
/27 255.255.255.22
4
10.0.0.193
-
10.0.0.222
10.0.0.22
3
Accounting 25 30 10.0.0.22
4
/27 255.255.255.22
4
10.0.0.225
-
10.0.0.254
10.0.0.25
5
Dispatch 15 30 10.0.1.0 /27 255.255.255.22
4
10.0.1.1 -
10.0.1.30
10.0.1.31

5NETWORK ARCHITECTURE
The network has been designed such that it can accommodate around 510 hosts if there is
increasing demand with growth in the business. It has been determined that presently there will
be 230 workstations as hosts in the network. The IP address will be allocated to the devices by
central router using DHCP (Dynamic Host Configuration Protocol). This means that automatic
allocation of IP address will be carried out for devices in the network. The wireless access points
will provide gateway to access the network through mobile devices so that guests are able to
have the facility of Internet access. However, the accessibility to the network will be restricted
according to the authorization level of users.
4. Used devices and cable types
The devices that will be used to set up the network infrastructure for Telstra Corporation
along with the required types of cables are presented as below:
Device Name Model Specification
Router Cisco 2911 Integrated
Services Router
 3 integrated 10/100/1000 Ethernet ports (RJ-45 only)
 4 enhanced high-speed WAN interface card slots
 2 onboard digital signal processor (DSP) slots
Switch Cisco 2960-X series
switch
 PoE: Power over Ethernet
 LAN Base: Advanced Layer 2 Feature set
 IP Lite: Basic Layer 3 Feature set
Server Cisco UCS C480 M5
Rack Server
 2666-MHz DDR4 memory and 48 DIMM slots
 12 PCI Express (PCIe) 3.0 slots
 32 Small-Form-Factor (SFF) 2.5-inch, SAS, SATA, and
PCIe NVMe disk drives

6NETWORK ARCHITECTURE
Wireless access
points
Cisco RV130W WF
wireless router
 4-port switch
 Ethernet, Fast Ethernet, Gigabit Ethernet, IEEE 802.11b,
IEEE 802.11g, IEEE 802.11n
 825 Mbps
 12000 ¦ IPSec VPN tunnels: 10 ¦ VPN tunnels: 10
Workstation Dell XPS 8500
Desktop
 CPU - Intel Core i7 (3rd Gen) 3770 / 3.4 GHz
 Max Turbo Speed - 3.9 GHz
 Technology - DDR3 SDRAM - non-ECC
 Memory Speed - 1600 MHz
 Installed Size – 8 GB
Laptops Apple MacBook Air  Processor - 5th Gen Intel Core i5
 RAM - 8 GB
 Disk Drive - 128 GB SSD
 Operating System - MacOS Sierra
Cables Cat 6 cable  Frequency - 250 MHz
 Return Loss (Min. at 100MHz) - 20.1 dB
 Characteristic Impedance - 100 ohms ± 15%
5. Cost analysis
The cost benefit analysis that has been calculated in context to the proposed network
design for Telstra Corporation is illustrated below:

7NETWORK ARCHITECTURE
Criteria Costs
Development
 Hardware $ 32,500.00
 Software $ 1,250.00
 Networking team salaries $ 9,650.00
 Training $ 1,500.00
Total Development Cost $ 44,900.00
Operations
 Hardware $ 9,250.00
 Software $ 350.00
 Operational Labor $ 13,500.00
Total Operational Cost $ 23,100.00
Net Benefits
 Approximate salary savings $ 150,000.00
 Reduced operating cost $ 50,000.00
Total Benefit $ 200,000.00
Discount Rate Used 4.00%
The total benefit that will be achieved from implementing the proposed network design
has been estimated as $ 200,000.00. The net benefits that will be achieved annually has been
calculated as the total of operational costs annually and one time development cost.
Discount Rate Used 4.00%
Annual Benefits $ 200,000.00
Annual Operational Costs $ 23,100.00
One-Time Development Cost $ 44,900.00
The below table presents the analysis of costs and benefits in context to the network
design where it is calculated that the investment will be returned within 05 years.

8NETWORK ARCHITECTURE
Year of Project
0 1 2 3 4 5 TOTALS
Economic
Benefit
$0.00 $
200,0
00.00
$
200,000
.00
$
200,000.
00
$
200,000.
00
$
200,000.
00
Discount Rate 1.0000 0.961
5
0.9246 0.8890 0.8548 0.8219
PV of Benefits $0.00 $192,
307.6
9
$184,91
1.24
$177,799
.27
$170,96
0.84
$164,385
.42
NPV of all
BENEFITS
$0.00 $
192,3
07.69
$
377,218
.93
$
555,018.
21
$
725,979.
04
$
890,364.
47
$
890,364.4
7
One-Time
COSTS
$(44,900
.00)
Recurring
Costs
$0.00 $
(23,10
0.00)
$
(23,100.
00)
$
(23,100.0
0)
$
(23,100.
00)
$
(23,100.0
0)
Discount Rate 1.0000 0.961
5
0.9246 0.8890 0.8548 0.8219
PV of
Recurring
$0.00 $
(22,21
$
(21,357.
$
(20,535.8
$
(19,745.
$
(18,986.5

9NETWORK ARCHITECTURE
Costs 1.54) 25) 2) 98) 2)
NPV of all
COSTS
$(44,900
.00)
$
(67,11
1.54)
$
(88,468.
79)
$
(109,004.
60)
$
(128,750
.58)
$
(147,737.
10)
$
(147,737.
10)
Overall NPV $
742,627.3
7
Overall ROI 5.0267
Break-even Analysis
Yearly NPV
Cash FLOW
$(44,900
.00)
$
170,0
96.15
$
163,553
.99
$
157,263.
46
$
151,214.
86
$
145,398.
91
Overall NPV
Cash FLOW
$(44,900
.00)
$
125,1
96.15
$
288,750
.15
$
446,013.
60
$
597,228.
47
$
742,627.
37