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BN321 Advanced Network Design For Human Factor

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1. It is difficult to build a solution if you do not know the requirements. Your task is to gather requirements (User, Application, Device and Network) to complete this project with the help of techniques such as Questionnaire, interviews from Users or Management staff. Students must discuss questionnaire/interview with tutor before
finalising all requirements. Furthermore, with the help of diagrams and flow charts, categorise and discuss all requirements in groups and create assessment plan for the Excelfior Ltd. network.
2. Your task is to come up with a logical, efficient and scalable network design that is suitable for Excelfior. Analyse all requirements gathered in Task 1 and proposed suggestions accordingly. Create network performance metrics including (Bandwidth, Delay, Jitter, Packet loss, Utilisation, uptime or responsiveness etc) and justify your proposed solution. Make sure you provide enough information that will allow IT technicians to build network infrastructure from scratch. The Company has an adequate budget to purchase networking devices, obviously does not want to spend more than necessary.




Excelfior Ltd. is a Melbourne based Digital Communication Company that specializes in designing, hosting and managing corporate websites. It has the department which help in each day activities of the company. Each department performs it duties and is independent to each other, this is meet by the network design which is established in the modules of each department. The department include the Admin, Accounts, finance, marketing department, front and backend developers and the flash designers. The admin is the overall administrator of the company. The roles of the admin are to ensure that each department is satisfied with the company network and that they run efficiently.  The accounts department keeps truck of records of the cash flow of the company which must run hand on hand with the admin to run efficiently – this is enabled by a network design which allows the two departments to communicate. The finance also works with the accounts department through the network to ensure that all finance related data is well stored and maintained. The marketing department uses the network to facilitate its adverts and that they can reach more people audience in the globe, thus the expectance of the customers increases. The company also has the developers who help in the company’s IT growth, the develop the companies front and backend systems which allows the company run well and smoothly [1]. Flash designer department also work in this Digital Company to ensure that the company’s designs are well organized, the network enable their smooth transition and communication thus efficiency.

The Network design is a key requirement in the Excelfior Ltd. Company. It ensures all departments can easily communicate and perform their duties efficiently. This paper explains the whole network design to be implemented in the Excelfior Ltd. Company.

Requirement Gathering

The requirement gathering refers to collecting all the gadgets, information, user requirements, devices and the network requirements.

User Requirements

From the model of system portions in our nonexclusive structure, the customer section is at the most lifted layer. The term customer addresses in a general sense the end customers of the structure, anyway it might be reached out to consolidate everyone drew in with the system, for instance, framework and system administrators and organization [2]. Customer essentials is the plan of necessities gathered or got from customer input and is what is required by customers to successfully accomplish their endeavors on the structure. Ordinarily, when gathering necessities, everyone required with that framework is seen as a potential customer.

The below diagram show the users in the system and the requirements of the users

User Requirements






Generally, the framework should adjust to clients and their surroundings, give fast and dependable data access and exchange, and offer quality support of the client. This shows the accompanying general prerequisites [3]:


A user can access information within the shortest time. For instance, when the client needs to send a record to another office or he needs to download a 20mb document.


This resembles accommodation anyway revolves around a response time from the structure and also the framework that is on the demand of the response times of customers.


This is the openness from the customer's perspective, is an essential for dependably available organization. Not solely should the customer have the ability to approach structure resources an abnormal state of the time, yet the level of organization to the customer, to the extent application usage or information transport, must be unfaltering.


Network Design

Application Requirements

Application Requirements will be essentials that are settled from application information, experience, or testing, and address what is required by applications. Application essentials are more specific than customer necessities anyway may at present be passionate.

Application essential are course of action of uses in light of human factors and development characteristics. The fundamental term, human parts, addresses human impression of different kinds of media, for instance, conventional substance, sound and video [4]. The second term, advancement characteristics, addresses the particular mechanical parts of these framework applications, for instance, data dealing with applications, web applications, structure applications.

Application asks for incorporate website page demands, Database exchanges – information questions or updates, Messaging conventions – putting a message on the line. Verification benefit – encryption, unscrambling, login reason and the API calls – peaceful interface calls.

Application system 

Level 1: Web server 

The web server is utilized to convey solicitations to at least one application servers. This web server has stack adjusting abilities and establishes the web level.

Level 2: Application server 

Application server is utilized to have the e-fund and e-accounts application. These servers comprise the application level.

Level 3: Database server

The Database server is utilized to store the application's information. This server lives at the database level

Kinds of utilization prerequisites depend on administration and execution necessities, applications were type as: mission-basic, RMA rate-basic, CAPACITY, or ongoing/intuitive and DELAY. These application composes are depicted by their prerequisites and administration measurements.

The Delay: It can set aside quite a while for a parcel to be conveyed over the systems. Application Locations are utilized to figure out where application applies in the organization. This will help in mapping activity streams amid the stream examination process.

Device Requirements

Gadget alludes to a bit of hardware that has been made for some uncommon reason.

Gadgets can be gathered into three classes: nonexclusive figuring gadgets: (PC, cell phone-cell phones), their prerequisites are essential from a conclusion to-end point of view, they give the interface among applications and the system. Servers - windows/Unix, cloud servers, affect the activity streams inside the framework. particular gadgets remote: (blue-tooth) are gadgets that give particular capacities to their clients [5].

Gadget issues oftentimes are misjudged as system issues. Understanding at the gadget part level can enable you to perceive such bottlenecks issues from the get-go in the examination procedure.

Gadget Locations data decides the connections among segments of the framework.

Requirements of the Network

System necessities alludes to interconnected frameworks. Segments of a PC organize incorporates: Hosts - PCs, workstations, handheld

The switches and routers - IP switch, Ethernet switch

The connections - wired, remote

Conventions - IP, TCP, CSMA/CD, CSMA/CA

Applications - organize administrations and

People who are the administration operators

Movement to the new system models and plans need to fuse existing systems. This incorporates framework redesigns, relocating and moving starting with one a player in something then onto the next part and to another or distinctive innovation or convention, or overhauling system foundation.

The new system will oblige any conditions and imperatives forced by old system, the system will change the size and the extent of the old framework. The change will be inside the LAN/MAN/and WAN limits of the old system [6].

System administration necessities is additionally playing out a security hazard examination for both the current system and arranged system. Security necessities and the consequences of the hazard examination are utilized to build up a security plan and characterize security approaches for the system.

Network Performance Metrics

System execution is the proportion of nature of administration of a system which addresses the client's issues [7].

System execution can be measure from various perspectives, as each system is distinctive in nature and outline. Execution can likewise be displayed and fortified rather than estimated; one case of this is utilizing state progress charts to demonstrate lining execution or to utilize a Network Stimulator. The accompanying measurements clarifies the system execution in the new system:


The accessible channel data transfer capacity and achievable flag to-clamor proportion decide the most extreme conceivable throughput. It isn't for the most part conceivable to send a bigger number of information than directed by the Shannon-Hartley Theorem [7].


The acceleration of light forces a base engendering period on every single electromagnetic flag. It isn't conceivable to decrease the dormancy beneath

{display style t=s/c_{m}}

 s is the separation while cm refers to the medium light speed. This around implies 1 additional millisecond roundtrip time (RTT) for 100 km/62miles of separation between has.

Different deferrals additionally happen in transitional hubs. In parcel exchanged systems deferrals can happen because of queueing.


Jitter is the undesired deviation from honest to goodness periodicity of a normal discontinuous banner in equipment and communicate correspondences, as often as possible in association with a reference clock source. Jitter may be found in properties, for instance, the repeat of dynamic pulses, the banner adequacy, or time of irregular signs. Jitter is a basic, and regularly undesired, factor in the diagram of all exchanges joins [8].

Error rate

In advanced transmission, the quantity of bit blunders is the quantity of got bits of an information stream over a correspondence channel that have been changed because of commotion, obstruction, mutilation or bit synchronization errors.

The bit botch rate or bit screw up extent is the amount of bit botches apportioned by the total number of traded bits in the midst of an examined time between time. Bit mistake extent is a unitless execution measure, consistently conveyed as a rate [9].

The bit mistake probability pe is the longing estimation of the bit screw up extent. The bit blunder extent can be considered as a construed measure of the bit botch probability. This measure is correct for a long time interval and a high number of bit botches.

Interplay of factors

The metrics above, combined with client prerequisites and client recognitions, assume a job in deciding the apparent 'quickness' or utility, of a system association.


System design out is one of the crucial occupations in guaranteeing that it needs the objective of the association. Framework is a related assembling of contraptions and end systems, for instance, PCs and servers, which can talk with each other. The physical parts are the gear devices that are interconnected to shape a PC sort out. Programming and firewalls accept an important activity in guaranteeing that data is anchored. Beside the physical contraptions, picking programming things for presenting in the framework is a trying endeavor.



[1] D. Tonelli . U.S. Patent No. 5,821,937. Washington, DC: U.S, Patent and Trademark Office, 2009.

[2] F. Travostino, J. Mambretti, & G. Karmous-Edwards, G. (Eds.). Grid networks: enabling grids with advanced communication technology, John Wiley & Sons,2009

[3] M. Hagan, H. Demuth & O. De Jesús. Neural network design (Vol. 20), Boston: Pws Pub,2012

[4] A. Kershenbaum. Telecommunications network design algorithms, McGraw-Hill, Inc,2009

[5] A. Ceder & N. Wilson. Bus network design. Transportation Research Part B: Methodological, 20(4), 331-344,2010.

[6] M. Conti, G. Maselli, G. Turi & S. Giordano. Cross-layering in mobile ad hoc network design, Computer, 37(2), 48-51,2011.

[7] T. Magnanti, & R. Wong. Network design and transportation planning: Models and algorithms, Transportation science, 18(1), 1-55,2014.

[8] C. Juang. A hybrid of genetic algorithm and particle swarm optimization for recurrent network design. IEEE Transactions on Systems, Man, and Cybernetics, Part B (Cybernetics), 34(2), 997-1006, 2008.

[9] C. Lin, & A. Metters. Hydrogels in controlled release formulations: network design and mathematical modeling. Advanced drug delivery reviews, 58(12-13), 1379-1408, 2015


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