A Local Area Network For A Sme Computer Science Essay

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In this 21st century every business field has applied the computer network technology to share the resources and software to reduce the cost and to improvement their business to get maximum profit by providing the quality & productive services to the customer.

To build the quality and proper network in a Small Medium Size Enterprise first of all we need to understand the needs and demand of the Enterprise. So SME wants to build the Client/Server architecture based Local Area Network having 40 staff member to share the data and resource across the wired network of 25 Desktop PC and 15 Laptop with wireless network using the wireless Access point, Internet connection with ADSL router, and 2 printer for printing purpose, 1 image scanner for scanning the documents, 1 virtual connection, Database Management System & Backup Server.

Finding the needs and wants of the SME, Firstly we have to selecting the proper technology then only we can build the network efficiently and can get faster performance for Client/Server architecture based Local Area Network which is as given below.

Hardware: - It is refers as a physical part which we can touch and sense easily.

Software: - Software is a collection of set of programs which is designed for computer instructions to carry out a special task which can be stored electronically on hard disk drive is called software. Software is often divided into two categories.

Systems software: Includes the operating system and all the utilities that enable the computer to function. Such as Microsoft Windows 7 and Microsoft 2003 Server are shown below.

http://asgmultiplex.com/i/server2003.jpg

http://img.diytrade.com/cdimg/1021136/10904700/0/1256851658/Microsoft_Windows_7_Ultimate_32BIT_Operating_System_Software__OEM_DVD.jpg

Applications software: Includes programs that do real work for users. For example, word processors, spreadsheets, and database management systems fall under the category of applications software are as shown below.

http://softwarebuzzer.com/wp-content/uploads/2010/10/microsoft-office-2007.jpg

Security System: - It is a process to protect the computer from unauthorized access to data and information of a private network connected to the internet. We can use different software for prevention of illegal access which is as given below.

Firewall: - It is refer to a computer program which has designed to block and protect unauthorized access while permitting authorized communications in a network. Firewalls can be implemented in either hardware or software, or a combination of both. SME has to use a McAFee Firewall for its network security which is given below.

http://ecx.images-amazon.com/images/I/51XT4MTDW5L.jpg

Antivirus: - It is used to notice, avoid and delete malware, including computer viruses, worms, and Trojan horses. SME has to use Kaspersky Antivirus program for its organization.

http://www.renew-antivirus.com/images/Antivirus/KIS20103PC.gif

Network Diagram:-

Network Address: - 192.168.1.0 / 24

Broadcast Address: - 192.168.1.255 / 24

IP Address for Desktop PC: - 192.168.1.12/24 to 192.168.1.36/24 and 192.168.1.37 to 192.168.1.79 is reserved for future use.

DHCP IP for wireless Network:- 192.168.1.80/24 to 192.168.1.95/24 for laptop and 192.168.1.96 to 192.168.1.125 is reserved

VPN: 192.168.1.126/24

192.168.1.9/24 to 192.168.1.11/24 is reserved for other server if required in future.

Topology:-

The physical topology of a network refers to the configuration of cables, computers, and other peripherals. Physical topology should not be confused with logical topology which is the method used to pass information between server and workstations.

After Knowing the needs of SME for Client/Server Network we has to use the Star Topology which is easy to implement and design because it is connected with each host computer over the network through central switch using Unshielded Twisted Pair cable to transmitting and receiving messages. The failure of a transmission line linking any host computer to the central switch will result in the isolation of that host computer from all others, but the rest of the systems will be unaffected.

2.2. Advantages of a Star Topology:

Easy to install wire.

No disruptions to the network then connecting or removing devices.

Easy to detect faults and to remove parts.

Technology:- Looking the needs and wants of SME for Client/Server Local Area Network we needs one wireless access point to share the data and resources over the wireless network using the Dynamic Host Configuration Protocol (DHCP) on it.

In a DHCP we have to fixed the 192.168.1.50 to 192.168.0.70 IP address. DHCP helps to assign the IP address automatically to the host over the wireless network.

Physical Component:

Cabling: it is the medium to transfer the infromation from one network device to another.So looking the topology we have to use the Unshielded Twist Pair Cat 6 UTP Solid Cable for SME. It is cheaper and easy to make when required. The manufacturer and model for the Cat 6 UTP PVC Solid cable are as given below.

Manufacturer: NETKEY

Model No: 001-003-005

Connector: RJ-45

Conforms to TIA/EIA-568-B.2.1

http://www.alibaba.com/product-gs/326852134/Cat6_UTP_indoor_outdoor_cable/showimage.html

Network Interface Card: It is a physical circuit board which is installed in a computer. It provides the physical connection between the network and the host computer. SME has to use Netgear FA311NIC which is shown below.

http://www.techfuels.com/everything-else/8450-netgear-fa311-network-adapter.html

Switches: - It is a small physical device that provides a central connection point for cables from host computer, server and peripherals. It is responsible for routing and processing data in a data link layer of the OSI model and function as a traffic management system, which determining the source and destination of each packet and forwarding them appropriately. SME has to use 2 24 port Switch for its LAN model of a Switch are as shown below.

Manufacturer: Net gear 

Model no: FS408

Connectivity: Integrated :10/100

Number of port: 24

Interfaces/Ports:   24 x RJ-45 10/100 Base-TX LAN

Flow Control:   IEEE 802.3x (Full-duplex

Connectivity Media:   Category 5/6 UTP

Standard Memory:   256 KB

http://www.broadbandbuyer.co.uk/Shop/Reviews.asp?ProductID=9304

Router: - It is an electronic device that interconnects two or more computer networks. Router determines the next network point to which a data packet should be forwarded toward its destination where each data packet contains address information that a router can use to determine the source and destination of a network. SME has to use one Router to its network. The manufacturer and model for the router are as given below.

Manufacturer: Net Gear

Model no: SD208

Connectivity: Integrated: 10/100 base network 

Number of port: 4

Interfaces/Ports:   4x RJ-45 10/100Base-TX LAN

Flow Control:   IEEE 802.3x (Full-duplex)

http://agcomputers.com.au/images/dg834g.jpg

Wireless Access Point: - It is an electronic device that uses radio waves to provide wireless high-speed Internet and network connections between sender and receiver by using radio frequency (RF) technology that permit employees to join wirelessly to a central network and a fixed wire network. SME has to use one WAP for its 15 laptop to connect. The manufacturer and model for the WAP are as given below.

Manufacturer: CISCO WAP4410N Wireless-N Access Point with PoE

Connectivity: Integrated: 10/100/1000 base wireless network

Interfaces/Ports:   4x RJ-45 10/100Base-TX LAN

Flow Control:   IEEE 802.3x (Full-duplex)

Connectivity Media:   Category 6 UTP

http://images.amazon.com/images/G/01/electronics/detail-page/B001IYCMNA-1.jpg

Wiring Closet: - The centre distribution point for cables in a network is called a wiring closet. The given images show the wiring closed design of SME.

http://www.lewrockwell.com/orig8/wiring-closet.jpg

Scanner: - It is an electronic device which captures images from photographic prints, posters, magazine pages and similar sources for computer editing and display. SME has one scanner which is connected directly to the switch and its ip address is 192.168.1.8

http://whatis.techtarget.com/definition/0,,sid9_gci212942,00.html

http://www.trgtech.com/popup_image.php?pID=22741

Printer: - printer is a computer peripehral device that prints a text on a paper as a hard form. There are different types of printer but SME uses 2 canon laser printer which is directly connected to the switch and its IP are 192.168.1.6/24 and 192.168.1.7/26 Printer model are as given below.

Manufacturer: Canon Laser

Model no: MP550

Resolution: 2400*4800 dpi

LCD screen: NO 

Size: H16*W46*D37

http://www.prlog.org/10298347-canon-isensys-mf4370dn-printer.jpg

Server: - It is a computer on network which manages resources such as a file server is a computer which is committed to save files from any system on a local area network in a building. SME has Windows 2003 Server operating system for its LAN and its IP is 192.168.1.1/24. Server has its own configuration which is as given below.

CPU: AMD Phenom IIX4 955 Black Edition.

Motherboard: Asus M4A87TD USB3

Memory: 8GB DDR3 1333 Mhz (4x2GB)

Hard Drive: 1TB S-ATAII 3.0 Gb/S

Optical Drive: 22x DVD±RW DL S-ATA

Graphics card: ATI Radeon HD 5770 1GB

Sound card: Onboard 7.1 Audio

Case: Xigmatek Asgard

Power Supply Unit: 500W PSU

Microsoft 2003 Server operating system

http://rtait.com/images/WHS%20Server%20Cropped.jpg

Workstation: - It is a computer designed to be used by one person at a time and which offer faster and high-performance than a personal computer. It has been configured to perform a certain set of tasks which may be assigned to certain employees For example; one workstation may be used for scanning images, while another is used for editing images. 25 Workstation use windows 7 OS having IP 192.168.1.12/24 to 192.168.1.36/24. Workstation configuration is shown below.

Brand- Dell

Manufacturer: Dell

Model no: 9100

Features:

Intel Pentium 4 processor

1GB DDRAM

17" Flat Panel Monitor

Integrated Intel pro 10/100 NIC

16*DVD +/-RW drive

Microsoft Window 7 operating system

http://images.digitalmedianet.com/2006/Week_30/iv6086ee/story/dell_precision_390_product.jpg

Web server: - It is a computer program which responds to the client using the Hypertext transfer protocal over the World Wide Web for accessing the web content and files such as web pages. Its IP is 192.168.1.2/24

Database server: - A computer in a network that provides database services to other computer as defined by the client server model. It can be accessed either through a "front end" running on the user's computer which displays requested data or the back end which runs on the server and handles tasks such as data analysis and storage. Its IP is 192.168.1.4/24

Backup Server: - A computer in a network which is designed to store copies of files from other servers or client machines to guard against data loss that has a very large disk. It can be accomplished using conventional backup software which must be installed on each backup server machine and backups will run normally to any conventional backup target period of time. Its IP is 192.168.1.5/24

IP Address: - It is a uniquely identifies numerical label that is given to any devices participating on a TCP/IP network for communication from one computer to another on the internet. The format of an IP address is a 32-bit numeric address written as four numbers separated by periods. Each number can be zero to 255. For example, 192.168.1.25 could be an IP address.

Virtual Private Network: - It is a protocol designed for secure communications in networks using Microsoft Terminal Services. People use remote desktop capability to do a variety of things remotely, including the following: Its IP is 192.168.1.90/24

Access a workplace computer from home or when traveling.

Access a home computer from other locations.

Fix a computer problem.

Perform administrative tasks.

Demonstrate something, such as a process or a software application.

Conclusion:-Computer Network is an interesting subject. We have gained so much knowledge about the networking. If we get chance then we are able to maintain and troubleshoot any types of network.

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