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DCAN202 Data Communication and Networking Assignment - Kent Institute, Australia

Unit Learning Outcomes addressed: Upon successful completion of this unit students should be able to:

a. Explain the purpose of the ISO-OSI model and TCP/IP and the significance to real-world networks such as LANS and the Internet.

b. Explain in detail the architecture of LANS, the IEEE 802 standards for station addresses and frame format, and the operation of LAN switches, and outline shortcomings in LANS such as security and broadcasts.

c. Describe in detail the architecture of the Internet, the operation of routing tables, routers and the operation of dynamic routing protocols and explain the purpose of layer 3 protocols and IP in particular, and the main fields in the IP packet header.

d. Describe in detail the features and protocol formats for presentation and Application layers and outline the basic architecture of the World Wide Web and Internet email systems.

e. Demonstrate basic competency with network discovery tools, dig and packet capture tools, construct, test and evaluate hypertext documents and client-side Application protocols.

Case study on Seagull International Business - Network Design

Executive Summary

A computer network is a collection of computers and other network devices such as router, switches, sharable printer and server. The network design plays vital role to deploy the design, business requirement and run business effectively. The Seagull international business has 50 employees are working in two different places. The company management decided to setup new office with various departments are administrative office, Data entry office, sales team and reception. The new requirement of this business are office staffs can access the internet, shared printer, word processing, access centralized server and also need to provide wireless connection for internet in reception area. The sales team can able to access the corporate network remotely and they can use wifi connection form office. As per above requirements of Seagull international business, here we provide network design, operating system setup for both server and desktop, solution to connect corporate office remotely, security for WLAN, internet connection for all and IP address for each network devices.

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Introduction

The network designer plays vital role to design the network as per business requirement which leads to goals of the of project. The goal can categories two types are business goals and technical requirements. The business goal focus on network design can make successful business and technical requirements can focus on implementation of technology into network. The Seagull international business which has 50 employees are working in two different places with various departments are administrative office, Data entry office, sales team and reception. The network design supports the office staffs can access the internet, shared printer, word processing, access centralized server and also need to provide wireless connection for internet in reception area. The sales team can able to access the corporate network remotely and they can use wifi connection form office. This report organized as following section network design, operating system setup for both server and desktop, solution to connect corporate office remotely, security for WLAN, internet connection for all and IP address for each network devices.

Topic 1 - Prepare and draw the network diagram for this office setup. Mention all network devices clearly (like workstations, routers, servers, etc.) in the diagram.

Network diagram

Data Communication and Networking Assignment.png

Data Communication and Networking Assignment1.png

Topic 2 - Discuss what desktop and server operating systems are feasible for this setup. Explain with logic why do you choose each operating system.

Desktop and Server operating systems setup

Desktop Operating System:

The standard operating system for small business is "Microsoft Windows" which most popular Operating System. The Windows 10 is latest version which was released in 2015. This operating system is widely popular for less compatibility issues to share the files with others companies. It is easy to learn which has familiar interface and less time to waste to learn this OS. It is also offering the largest library commercial software which provide the access to a large amount of freeware and shareware. The Windows operating system has more option for hardware than other operating system and all drivers are easily available which can help us to select for our personal computer as per requirements. The main advantage of Windows operating system for desktop is maintenance cost is free which is not only strong point due to it has various hardware and software options to test all configurations impossible. The main drawback of Windows operating system is insecure but Seagull international business not required any security on files and they mainly work on data entry and word processing. So, windows operating system is correct choice for this business. Here this business not concern of security, access open source software and content creation so we can choose Windows 10 operating system.

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Server Operating System:

The "Clear Operating System" for small and non-profit business looking for an inexpensive way to select server for small business because it is open source and do with all server operating system. This operating system has less expensive tools which make all operations easily by administrator. It is combination of Red Hat enterprise which can fulfil the need of small business. It is open source operating system and it offers number of services. The Clear Operating System has following benefits

  • It is simple, affordable to manage the IT environment and secure.
  • It can support and friendly with any browser.
  • It provides full remote access to system from anywhere so that we can control complete IT environment using internet.
  • It has browser-based interface and easy to learn to manage.
  • This OS ensure the traffic which is coming and going with right kind of traffic.
  • It is also managing the bandwidth, security based on web interface for internal and DNS.
  • It is flexible to setup and manage any kind of server.
  • It is help to protect the network with all security features and keeps out all unwanted viruses, hackers and spam.

Topic 3 - Provide an appropriate solution for the Sales Team to connect to corporate Network remotely by using their laptop.

Solution for the Sales Team to connect to corporate Network remotely

The cost of preserving dedicated telephone connections amongst branch workplaces and headquarters can be exquisite. The corporation workplace and profits crew wish a dedicated multiline voice connection to the number one workplace which incorporates T1 or T3. The corporation and sales team want to be interconnected; an ever-growing massive form of connections are required. A centrally located IP-PBX cluster can manipulate all voicemail and each other cellular phone features for business enterprise workplace and for income organization offices. Connectivity between organisation workplace and the vital IP-PBX is finished through the internet. A confined style of community PSTN connections can be retained for corporation continuity inside the occasion of a failed internet connection.Thesecurity may be provided inside the intraoffice communications with a VPN. However, this requires one VPN account in keeping with trunk, which requires powerful VPN. VPN connections upload overhead to the internet connection which consumes bandwidth (Stallings 2012). We need to upgrades and similarly configuration to routers, firewalls, and exclusive community additives may be required to achieve a totally sensible and green VoIP device. VPNs can be tedious to setup for a VoIP tool, and may require precise configuration for each purchaser. The solution for this SBCs to interconnect VoIP LANs sooner or later of the net. SBCs are installation at the brink of each LAN and artwork transparently, without a need to configure humans' machine (Forouzan 2014). This requires loads a great deal less effective servers and masses lots much less configuration and control in comparison to VPNs. The SBC protects the network from protection threats, and might offer voice encryption, developing the quantity of voice privateness. Using an SBC to govern intraoffice voice connections offers a robust answer with lower tool costs, and with masses a whole lot less disruption to the network and to clients, than the use of a VPN to carry out the identical detail.

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Topic 4 - Provide a solution for internet and telephone connectivity keeping that in mind the network performance should allow both admin and data entry team to work efficiently.

Solution for internet and telephone connectivity for both admin and data entry team

The solution for internet and telephone connectivity for both admin and data entry team in Seagull international business is Digital Subscriber Line (DSL)Stallings (2012). The DSL can available in low cost internet which can offer by various phone companies such as AT&T, Verizon and Qwest. It is used to run the business on phone line and connect the computer networks using DSL modem or network router. The DSL speed can depend on the location of the business and it is related to Phone Company's office. The relocating of the internet service is not an issue due to widespread of availability. The DSL download speed starts from 1.5 Mbps to 40 Mbps and uploading data is less than 1 Mbps. The service cost of DSL is an approximately $100 per month (Forouzan 2014).

Data Communication and Networking Assignment2.png

The Virtual Private Network (VPN) is private network which is used to connect the more remote site though public network. The VPN provides the tunnel via public networks from the service provider instead of connecting network dedicatedly. The VPN is cost effective than dedicated lines which required dedicate line for each and every node and it will be expensive. We have various types of VPN network which can determine by the type of the network, customer network perform in the virtual tunnelling. This will be best selection for this current business requirement because budget cost is less and internet speed also normal so that business can run effective and efficient way within budget cost.

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Topic 5 - Wireless LAN security is crucial as Sales Team will use Wi-Fi when they will be in the office. Provide appropriate Network Security Solution for wireless LAN of this company.

Network Security Solution for wireless LAN

The network security for Wireless Local Area Network can provide in two ways are hardware security and logical security. For this business we prefer logical security because we need more security to connect wifi network in office and sales team.

Logical security

The logical security comes under software security which can provide all basic requirement of network security such as authentication, authorization, encryption and protect intrusion in wireless.

Authentication:

An authentication identifies the user to access the wireless network because there is no physical port so authentication is essential security requirement to ensure the authorized user can allow to access the wireless network. The purpose of auditing and accounting we can go with WPA and WPA2 can use with 802.1 x wireless standard and Remote Authentication Dial-In User Service (RADIUS) server (Stallings 2012). This server can allow the wireless users to authenticate against backend user databases such as Novel Netware, LDAP etc. This server provides the sign on procedure for the user which is similar to wired network login. In authentication, we have even high level to provide more security using smart card, token-based authentication.

Encryption:

An encryption is a primary concern for wireless network which can access by anyone who had network card to gain the access and capture the network packets with wireless sniffer. The wireless standard 802.11 developed for Wired Equivalent Privacy (WEP) which can encrypt the traffic at layer 2 but it is not secure. The Virtual Private Network (VPN) to provide the data protection on wireless networks. The VPN offers strong encryption but it has to add a lot of overhead so it will decrease the throughput of network. So best and better way is to provide the encryption for wireless network is Wi-Fi Protected Access (WPA) (Stallings 2012). The WPA is use the Temporal Key Integrity Protocol (TKIP) and also it provides dynamic key rotation which is difficult to capture the network packets and decipher it. So, this will be best security for wireless network in Seagull business to protect the data.

Wireless Access Point 3 has strong user privacy in public wifi network through an individual encryption of data. This is automatically increasing the network protection even user password length is shorter than it will recommend to set the complex password to protect the public network. In all industries, government and defence use the WAP3 because it has 192-bit security which aligned with National Security Algorithm (CNSA) to protect the wifi networks with more security requirements. So, we can select the WAP3 for this case study to protect the network in wireless LAN.

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Topic 6 - Allocate appropriate IP address for all network devices in the network diagram including Sales Team logging remotely.

Allocate IP address for all network devices

The Seagull is small business so we can go with class A and network address is 10.0.0.0/16

S. No

Name of the Network Device

IP Address

1.

Main Router

10.0.0.1

2.

Main Switch

10.0.10.1

3.

Centralized Server

10.0.20.1

4.

Shared Printer

10.0.20.2

5.

Office Wifi Access Point

10.0.20.3

6.

Reception Wifi Access Point

10.0.20.4

7.

Administrative Switch

10.0.10.2

8.

Data Entry Switch

10.0.10.3

9.

Sales Team Switch

10.0.20.4

10.

Office Host (2)

10.0.20.5 - 10.0.20.10

12.

Administrative Host (18)

10.0.30.1 - 10.0.30.18

13.

Data Entry Host (20)

10.0.40.1 - 10.0.40.20

14.

Sales Team Host (12)

10.0.50.1 - 10.0.50.12

15.

Reception Host (2)

10.0.60.1 - 10.0.60.2

Conclusion:

This report given solution for Seagull international business which has 50 employees are working in two different places with various departments are administrative office, Data entry office, sales team and reception. The network design supportsthe office staffs can access the internet, shared printer, word processing, access centralized server and also need to provide wireless connection for internet in reception area. The sales team can able to access the corporate network remotely and they can use wifi connection form office. This report discussed about network design, operating system setup for both server and desktop, solution to connect corporate office remotely, security for WLAN, internet connection for all and IP address for each network devices.

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