COMPUTER_NETWORK_COMMUNICATION FORM 4

 

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COMPUTER_NETWORK_COMMUNICATION FORM 4

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LA3 COMPUTER NETWORK & COMMUNICATION 3.1 3.111 Define Computer Networks A computer network is a system of interconnected computers and peripheral devices. 3.112 Define computer communications Computer Communication is a process in which two or more computers or devices transfer data, instructions and information. 3.12 Importance of Computer Network 1. Sharing data and information. 2. Sharing of program / software 3. Sharing hardware such as printer 4. Provide communication possibilities faster than other facilities. 5. Allow user to access remote programs and remote databases. some of the importance of networks and communications are: E-business – sell and conduct online shopping through a network Online education – share knowledge, search for information and join an online discussion E-banking – pay bills, browse account balance and transfer money to other parties without going to the bank long distance communication – communication with people anywhere in the world can be faster, and easier and save cost 3.13 Types of Networks Three types of network are: - Local Area Network (LAN) - Metropolitan Area Network (MAN) - Wide Area Network (WAN) LAN Is a group of computers and network devices connected together, usually within the same building covering a small geographic area, like a home, office or School. Inexpensive hardware used in LAN( twisted pair, coaxial cables or wireless) LAN is a very high speed network which is faster than MAN and WAN

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MAN Is a group of computers and network devices connected together within a large physical area MAN uses fibre optics as connection medium MAN can be a collection of several LANs within the same city MAN often acts as a high speed network (although not as fast as a LAN). WAN Defined as a group of computers and network devices connected together across a very large physical area such as states or countries WAN is the largest network of all network types Internet is the largest WAN in the world WAN can be a group pf MANs or LANs or the mixture of both networks 3.1.3.2 Differentiate between these three types of computer networks Criteria Network size Transmission media type Speed Cost WAN Largest fibre optic cable, radio wave , sattelite Slowest Higher MAN Larger Twisted pair and fibre optic cable Slow High LAN Small Twisted pair Fastest Low 3.14 Network Architecture 3.1.4.1 Define two types of network architecture Network Architecture Client/Server Definition Is a network in which the shared files and applications are stored in the server . Cabling Cost Network Usage Ease to manage Software needed Higher Cabling Cost Is uded in small and large network Easy to manage Install software only in the server Peer To Peer Is a network with all the nodes acting as both servers and clients. All computers have Equal capabilities to use the resources. Cheaper Cabling Cost Used in small networks (less than 10 PC) Hard to manage Install software to every computer

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3.1.5 Network Topology 3.1.5.1 State three types of network topologies : STAR TOPOLOGY RING TOPOLOGY BUS TOPOLOGY Aspect Host Failure Node Failure Structure Ring network will fail network will fail all nodes connected in a circle difficult Topology Star network will fail network can still run A central host and all nodes connect to it average Bus network can still run network can still run A central cable (backbone) and all nodes connect to it easy Ease of adding /removing nodes

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Ease of troubleshooting Connection between nodes Host existance Easy Yes No Difficult No connection . Yes Difficult. No connection No 3.1.6 Protocol 3.1.6.1 Define TCP/IP PROTOCOL is a set of rules for the exchange of data between a terminal and computer or between two computers. TCP/IP (Transmission Control Protocol/Internet Protocol) is a set of protocols developed to allow cooperating computer to share resources across the networks. 3.1.7 Internet, Intranet & Extranet Internet Is the worldwide, publicly accessible system of Intranet Extranet interconnected computer networks, which connects millions of computer all over the world. Is a private computer network that can be accessed only by authorized persons, especially members or employees of the organization that owns it is a private network that can be accessed only by authorized persons to securely share part of a business’s information or operations with suppliers, vendors, partners, customers or other businesses. 3.2 Hardware Requirements 3.2.1 Devices 3.2.1.1 Identify the devices needed in computer network communication:Network Interface Card (NIC) Wireless Network Interface Card (WNIC) internal and external modem hub or switch router wireless access point

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DEVICE NAME Network Interface Card (NIC) Wireless Network Interface Card (WNIC) FUNCTION Is an adapter card or PC card that allow computers to access and communicate over a wired computer network.(Via Cable) Is a network card that provides wireless data transmission which connects to a radio-based computer network that allow computers to access and communicate over a wireless computer network. Is a device that enables a computer to transmit data Internal and over telephone or cable lines. It may need to convert external modem (MOdulator/DEModulator) digital signals to analog signal (and vice versa)before transferring data, instructions and information. Is a connection point for devices in a network LAN. A Hub or switch hub connects all the devices on its ports together. A switch understands when two devices want to talk to each other, and gives them a switched connection Is a communications device that connects multiple Router computers or other routers together and transmits data to the correct destination A wireless access point is a central communications Wireless access device that allow computers to transfer data point wirelessly to other wireless devices or to a wired network. 3.2.2 Medium 3.2.2.1 TWISTED-PAIR CABLE COAXIAL CABLE FIBRE OPTIC UTP CABLE STP CABLE

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3.2.2.2 Identify the various types of wireless transmission media. Radio Waves [ Bluetooth, WIFI(Wireless Fidelity) ] Microwaves (Satellite) Infrared 3.3 Software Requirements 3.3.1 Server Software 3.3.1.1 Define Network Operating System Is an Operating System to designed to support a network. NOS organizes and coordinate how multiples users access and share resources an a network 3.3.1.2 Name Various Network Operating System Software N O S WINDOWS NT, WINDOWS 2000 SERVER, WINDOWS SERVER 2003, RED HAT LINUX, NOVELL, NET WARE, SUN SOLARIS, UNIX

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3.3.2 Client Software 3.3.2.1 State the function of various client software WEB BROWSER Function : Is a software application for retrieving, presenting and traversing information resources on the World Wide Web. Example: Microsoft Internet Explorer, Safari, Netscape Navigator, Opera, Firefox, Chrome, Camino , Netsurf E-MAIL CLIENT Function : Is computer program which is used to Read, Create, send, e-mail messages. Example: Microsoft Outlook Express, Mozilla Thunderbird, Yahoo mail, Hot mail, Eudora, Mahogany, Opera mail NETWORK UTILITIES Function : Are small software utilities designed to analyze and configure various aspects of computer networks. The most common tools include: Ping : ping a host to check connectivity. Traceroute , nslookup. NETWORK FILE MANAGER Function : To access files and folders on others computer in the network via such protocol as FTP, NFS, SMB or WebDAV

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3.4 Setting Network Facilities 3.4.1 Installation of NIC 3.4.1.1 Insert NIC Insert the NIC into the slot by firmly pressing the card down either the ISA (black) or PCI (white) Slot. (depending on the NIC you are using) 3.4.1.2 Install drivers for the NIC When the NIC is in the PC, boot up your PC and insert the CD that is provided and run the setup to install the Network Card Driver. 3.4.2 Cable Crimping and Testing 3.4.2.1 Crimp and Test UTP cable Types STRAIGHT CABLE From PC to Hub/switch CROSSOVER CABLE From PC to PC 3.4.2.2 Create awareness of the correct way when crimping a cable Skin off the cable jacket using cable stripper. Untwist each pair and straighten each wire. Cut all wires (90 degree) Insert the wire into the RJ45 connector Place the connector into a crimping and squeeze hard. Use a cable tester to test for proper continuity

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3.4.3 Configuration and testing of network 3.4.3.1 1. 10.37.152.111 2. 255.255.255.192 3. 10.37.152.65 3.4.3.2 Test the network connection Best utility to test network connection is by using Cable Tester 3.4.4 Share Data 3.4.4.1 Create a share folder I . Configure your computer for file sharing StartControlPanelNetwork ConnectionLocal Area Connection  Properties. Select General tab  check the File and Printer sharing for Microsoft Networks . II. Setting up the folder that will be share Right click on the file to be shared  select Sharing and Security  select Share this Folder  click Permissions  click Everyone  click Remove  Click Add  check/uncheck the Read/ Change/ Full Control boxes  click OK

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