1. What is a network, what are the main types? <ul><li>A network is two or more computers joined together for the purpose of transmitting and receiving data and also transmits any combination of voice and video between users. </li></ul><ul><li>The network includes the network operating system in the client and server machines, the cables connecting them and all supporting hardware in between such as bridges (Bridges reduce the amount of traffic on a LAN by dividing it into two segments and inspecting data flow) and routers. </li></ul>
Types of networks LAN; Local Area Networks Local Area Networks are networks that are confined to one geographical area I.e. school figure 1.1 WAN; Wide Area Network Wide Area Networks are a network of geographically distant computers and can be made up of a number of LAN’s linked to each other. Figure 1.2
2. Types of Network typologies <ul><li>Topology </li></ul><ul><li>A topology is a description of any kind of locality in terms of its layout. In communication networks, a topology is a usually schematic description of the arrangement of a network, including its nodes and connecting lines. There are two ways of defining network geometry: the physical topology and the logical or signal topology. </li></ul>
In the bus network topology, every workstation is connected to a main cable called the bus . Therefore, in effect, each workstation is directly connected to every other workstation in the network. In the ring network topology, the workstations are connected in a closed loop configuration. Adjacent pairs of workstations are directly connected. Other pairs of workstations are indirectly connected, the data passing through one or more intermediate nodes. In the star network topology, there is a central computer or server to which all the workstations are directly connected. Every workstation is indirectly connected to every other through the central computer.
Apparatus need to connect a network: <ul><li>The computer would need an Ethernet card (on board or a PCI card) these in which would plug RJ-45 cable. </li></ul>2. RJ-45 cable Short for Registered Jack-45, an eight-wire connector used commonly to connect computers a, LAN especially Ethernets . RJ-45 connectors look similar to the RJ-11 connectors .
What is a router and a hub and there functions within the network ROUTER <ul><li>In packet-switched networks such as the Internet, a router is a device or, in some cases, software in a computer, that determines the next network point to which a packet should be forwarded toward its destination. The router is connected to at least two networks and decides which way to send each information packet based on its current understanding of the state of the networks it is connected to. A router is located at any gateway (where one network meets another), including each point-of-presence on the Internet. A router is often included as part of a network switch. Each router has its own IP address. </li></ul><ul><li>HUB </li></ul><ul><li>A hub is used in a wired network to connect Ethernet cables from a number of devices together. The hub allows each device to talk to the others. (Hubs aren't used in networks with only wireless connections, since network devices such as routers and adapters communicate directly with one another, with nothing in between. Hubs are such simple devices — they require no configuration, </li></ul>
How to make a sharing file (folder / how to communicate within the network). <ul><li>Windows XP lets you share a computer's disks and folders with other computers on the network, using a method called Simple File Sharing . There are two ways in which the user can achieve this. The fist could be sharing a hard disk and all its folders and subcontinents </li></ul><ul><li>Right click the disk or folder that you want to share and select Sharing and Security . </li></ul>
Right click the disk or folder that you want to share and select Sharing and Security . If it is the first time that a user shares files or creates a sharing folder the system will notify them to use the Network Setup Wizard for safety reasons.