Best Fit Topology for Local Network - Case Study

This case study discusses the best fit topology for local network for Inspire Energy Limited. It includes the identification and classification of applications used by IEL, technical requirements in terms of availability, performance and security, traffic measurement and analysis, and LAN traffic load analysis. The recommended topology is a star topology.

Case Study of Best fit topology for local network

Table of Contents
Introduction:-..........................................................................................................................2
Identification and classification of applications used by IEL:-..................................................4
Headquarters Premises Diagram:........................................................................................................5
Network Topology Diagram:................................................................................................................6
Classification of the technical requirements in terms of availability, performance and
security:-.................................................................................................................................7
Performance:-......................................................................................................................................7
Availability: -........................................................................................................................................7
Security: -.............................................................................................................................................7
Traffic measurement and analysis:-.........................................................................................8
Delay: -.................................................................................................................................................9
Capacity: -............................................................................................................................................9
Traffic load Analysis of LAN:-...................................................................................................9
A:-......................................................................................................................................................10
B:-......................................................................................................................................................10
References.............................................................................................................................11
Page 1

Network Case Study Solution
Introduction: -
As indicated by writing study we found that "An Inspire Energy Limited (IEL) is a national
supplier of protected, perfect, low ozone harming substance outflows vitality and remote
vitality arrangements.
IEL right now deals with an arrangement of more than 500MW of intensity age offices crosswise
over Australia, using a scope of fuel sources working in four principle zones: sun-oriented
vitality, flammable gas, landfill gas and waste coal mine gas.
IEL's clients are regularly substantial open organizations or government bodies. Different clients
incorporate substantial vitality retailers and proprietors of landfill destinations. The Company is
centred around altogether expanding its introduced age limit through updating limit at existing
offices and growing new undertakings.
Fig1 IT infrastructure diagram for Inspire Energy Limited
Page 2

The headquarters staff are shown below:
Group
parameters
Function specification Number of
Staff
Executive
management
Company management and executive support 15
Corporate
services
Finance, human resources, health and safety, and
support staff
40
Project Services Design and construction of new energy projects 35
Operations Management of remote power generation sites via a
24/7 control centre
30
Page 3

Using our knowledge, we (i.e. network engineer) prepare a statement of requirements that
include the following:
Identification and classification of applications used by IEL: -
Business prerequisites recognizable proof the more elevated amount, business-arranged necessities that
a customer needs to accomplish through the system configuration venture.
- Understand the customer's business
- Understand the system scope
- Identify and characterize applications
- Understand business imperatives
Operational staff: - The venture's specialized destinations, which empower improvement of the
specialized outline and choice of reasonable gear.
Run of the mill specialized necessities include:
- Scalability
- Availability
- Performance
On the existing setup, print server and payroll system are accessible for the end user. The data center
Email access also having for the user. The user workstation also connected accessible via LAN and Wi-Fi.
The same we need to test for the new premises environment.
We need to test the new office LAN environment before move the user into the premises. We need to
check the connectivity as like the old premises. The user must accessible the Email from the datacenter
the user having the connectivity for the LAN and Wi-Fi. The finance payroll and payslip should be
accessible for the end user. This has been tested before move the user into new headquarters premises.
Page 4

Headquarters Premises Diagram:
1. The technology group has initiated a project that has the objective of ensuring a smooth
migration of all IEL’s technology systems to the new building, without any adverse
business impacts. The new headquarters setup is designed as per the requirement. The
old premises servers and work station should accessible the email which is hosted in
Data-centre. As like same end user workstation is accessible internet via Wi-Fi and LAN.
We have failover scenario also performed using 2 ISP. If one ISP like is down, another
should take over the traffic.
Page 5

Network Topology Diagram:
A constellation or topology is known to define the physical or real-time position of devices and
nodes in the web. primarily 2 styles of topology existing physical and logical. Some common
topologies are bus, star, tree, ring and mesh. The best fit topology for this scenario STAR
TOPOLOGY which shown in the diagram.
Page 6

As outlined in the Case Study, we working as a “network engineer" in team to develop the LAN
requirements, logical design and technical specifications for IEL's new headquarters building. A network
engineer should ideally have a well and in-depth understanding of all the network technologies and their
capabilities. It is because of these skills that the network designer is able to meet the client requirement
by creating a design which is scalable, available, secure and manageable.
The network engineer role is also seen during the Planning and Designing phase of the PPDIOO
network life cycle.
Classification of the technical requirements in terms of availability,
performance and security: -
Performance: - Each ISP has 50Mbps of link. Always we do not have any performance
degradation. If 150 users are wants to access the email and accessing an internet and download
the file it will not affect the performance. Since the capacity of the internet link is high.
However, it will utilize only 15Mbps if all users are accessible internet at a same time.
Availability: - We have 2 ISP link for redundancy to have access for email and Internet. If one
goes down another will be take over the traffic. As like same, we have redundancy at core level
too. If any one goes switch down, another will be take over.
Security: - In an electronic network security parameter is a crucial issue, without secure
connections reliable communication cannot increase. A security will be reached in wireless or
wired network victimization secret, authentication and access rights. A password is one of the
basic concepts of providing security. The password set should be combination of special
character, one numeric value, one capital letter and one small letter. It must be at least eight
characters long. Another concept to achieving security is access rights like (write, read) (read,
write) (write, write) and (read, read) data.
Page 7

Fig2 Security management in HQ IEL’s and sub branches
Traffic measurement and analysis: -
Some traffic measurement and analysis has been undertaken on the existing IEL LAN. Based on
this work, the table below was produced, showing the peak rate of data transfer for a number
of applications and mapped to organisational units. A data transfer or traffic of network can be
measured by delay and capacity parameters of the network. Both parameters can be defined as
follows:
Page 8

Delay: - It characterizes postponement of flag travel time amongst sender and recipient hubs,
the process time of data at each machine amongst sender and collector. A postpone limitation
must be less for most extreme throughput.
Capacity: - In PC arrange limit characterizes stack circulation or load adjusting between at least
two interconnected system. This procedure is finished with the assistance of system bunching
technique.
Data store Location Used by User Community
(or communities)
Peak Data Rate (Mbps)
Local file and print servers On-site All users 228
Shared file servers Data centre All users 42
Finance On-site Corporate Services 4
HR & Payroll On-site Corporate Services 1
SCADA On-site Operations 84
SCADA Other sites Operations 12
Traffic load Analysis of LAN: -
In rush hour gridlock hypothesis, we measure movement stack. Activity stack is the proportion
of demand landings in a predefined timeframe to the normal measure of time taken to benefit
each demand amid that period. These estimation units depend on Average Hold Time (AHT).
AHT is the aggregate time of all solicitations in a predefined period isolated by the quantity of
demand in that period. The two principle estimation units utilized today to gauge activity stack
are Erlangs and centum call seconds (CCS).
(total request per seconds)/ (number of request) = ……. sec per call = AHT ……. seconds
Page 9

A: -
Traffic load of enterprise network = (228+42+4+1+84+12)/6
= 61.833%
B: -
Data store Peak Data Rate (Mbps)
Local file and print servers 228
Shared file servers 42
Finance 4
HR & Payroll 1
SCADA 84
SCADA 12
In IEL’s case study given that peak data rate in mbps. According to cisco a “Peak
Period” is a time which records the highest traffic volume measured during a day. This method requires
continuous measurement and is typically used in environments where the peak hour may be different from day
to day. SO, in above table the peak data rate is given and its calculate by addition of measured data. In this case
study we need to find out peak data rate of LAN.
Then
Peak data rate of LAN = 228 mbps.
Page 10

References
A New Dynamic Bandwidth Assignment Algorithm for Ethernet-PON. (2003). The KIPS
Transactions:Partc, 10C(4), 441-446. doi: 10.3745/kipstc.2003.10c.4.441
DeCusatis, C. (2008). Handbook of fiber optic data communication. Amsterdam: Academic
Press/Elsevier.
International seminar on computer networking and performance evaluation.
(1986). Performance Evaluation, 6(1), 73-82. doi: 10.1016/0166-5316(86)90010-6
Kopparapu, C. (2002). Load balancing servers, firewalls, and caches. New York: Wiley.
Local area network. (1983). Computer Communications, 6(4), 219. doi: 10.1016/0140-
3664(83)90081-6
Local area network specifications. (1980). Computer Communications, 3(4), 197. doi:
10.1016/0140-3664(80)90100-0
Spurgeon, C. (2014). Ethernet. Helion.
Page 11