information technology

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What Is Data Communication Information Technology Essay

What is Data communication. Data communications means many things to different people, but when we are dealing with computers and our interactions with them, we are typically discussing equipment that was designed to provide or gather information needs to communicate beyond itself to similar equipment or to a dissimilar system, data communication provides the tools, products and equipment to make this happen.

What is a network? A network is a series of points or nodes interconnected by communication paths. Networks can interconnect with other networks and contain sub networks .A network is a group of two or more computer systems linked together. There are many types of computer networks, including: Local-area networks (LANs) : The computers are geographically close together . Wide-area networks (WANs) : The computers are farther apart and are connected by telephone lines or radio waves. Metropolitan-area networks (MANs): A data network designed for a town or city.

Define Question 1

What are Network Component? I think you have come across the term “Computer Network” many times. That is the chances to let u know all about LANs, MANs, WANs, network topologies, and Internet. This mini website will give you a brief overview of the main components.  Some of the information can be a little technical but we have tried to explain it as clearly as possible. http://www.teach-ict.com/as_a2/topics/networks/network%20components/network_components/images/network.gif

Answer Question 1

BRIDGE – A bridge device filter data traffic at a network boundary. Bridges reduce the amount of traffic on a LAN by dividing it into 2 segment- Bridges operate & Bridges serve.

Bridges operate at the data link layer (Layer 2) of the OSI model. Bridges inspect incoming traffic and decide whether to forward or discard it. An Ethernet bridge, for example, inspects each incoming Ethernet frame - including the source and destination MAC addresses, and sometimes the frame size - in making individual forwarding decisions.

Bridges serve a similar function as switches, hat also operate at Layer 2. Traditional bridges, though, support one network boundary, whereas switches usually offer four or more hardware ports. Switches are sometimes called "multi-port bridges" for this reason.

http://technet.microsoft.com/en-us/library/Bb457037.tplgy04_big(l=en-us).gif

ROUTER – Is a hardware device design to take incoming packets, analyzing the packets and then directing them to the appropriate locations, moving the packet to another network, converting the packets to be moved across a different network interface, dropping the packets.

A router has a lot more capabilities than other network devices such as a hub or aswitch that are only able to perform basic network functions. For example, a hub is often used to transfer data between computers or network devices, but does not analyze or do anything with the data it is transferring.

http://www.home-network-help.com/images/connect-wireless-router.jpg

DSL modem (Digital subscriber line) – is a type of modem used to connect a PC to the internet. DSL modems can provide for fast internet access, as they are designed for use with high-speed DSL connections DSL connections are considered much faster than dial-up Internet connections. In addition to greater speed, DSL service allows the user to talk on the phone while simultaneously accessing the Internet.

DSL Modem

Network switch - is a small hardware device that joins multiple computers together within one local area network (LAN). Technically, network switches operate at layer two (Data Link Layer) of the OSI model.

Network switches appear nearly identical to network hubs, but a switch generally contains more intelligence (and a slightly higher price tag) than a hub. Unlike hubs, network switches are capable of inspecting data packets as they are received, determining the source and destination device of each packet, and forwarding them appropriately. By delivering messages only to the connected device intended, a network switch conserves network bandwidth and offers generally better performance than a hub.

http://www.h3c.com/portal/res/200701/18/20070118_24342_image003_e3a6a7fb-ca24-4e9b-aae4-18a5750a3331__0.jpg

Network interface card (NIC) - is a computer circuit board or card that is installed in a computer so that it can be connected to a network. Personal computers and workstations on a local area network (LAN) typically contain a network interface card specifically designed for the LAN transmission technology, such as Ethernet or token ring. Network interface cards provide a dedicated, full-time connection to a network. Most home and portable computers connect to the Internet through as-needed dial-up connection. The modem provides the connection interface to the Internet service provider.

http://www.voxtechnologies.com/MOXA_Products/images/async_solution_1.gif

HUB - A hub is a device that connects PCs together. In general, what is called a hub in today’s market is a "dumb" device. In a hub, when one PC sends data onto the wire, the hub simply forwards the packets to all the other devices connected to it. Each device is responsible for determining which packets are destined for it and ignoring the others. Current "hubs" typically share bandwidth between all the ports. In the days of coaxial networking, hubs were often called "bridges". Because they forward every packet that they receive, they do nothing to streamline the traffic on your local network. 

http://www.msnsniffer.com/images/hub.gif

REPEATER - a repeater is a device that receives a digital signal on an electromagnetic or optical transmission medium and regenerates the signal along the next leg of the medium. In electromagnetic media, repeaters overcome the attenuation caused by free-space electromagnetic-field divergence or cable loss. A series of repeaters make possible the extension of a signal over a distance.\

http://www.home-network-help.com/images/wireless-repeater-network.jpg

Define Answer 2

Networking needs a lot of components to work. Cable are also very important in getting the network components to work.


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