Eleanor's Website Logo Eleanor's Website banner
home page
computer page
build a pc page
Inside a computer page
Input devices page
Output devices page
Data storage page
Processors page
Logic gates page
types of computer
operating system page
application software page
Internet page
world wide web page
Web page develpoment page
research and plagarism page
Data base page
stock control page
Computer maths page
Computer language page
Programming page
system life cycle
Control systems page
Networks page
Data types page
Indentity,theft and loss page
Threats to computers page
IT and crime page
Intellectual Property & Copyright page
Role of IT proffessional page
 
Networks

What is a network?

A computer network, or data network, is a digital telecommunications network which allows nodes to share resources. In computer networks, computing devices exchange data with each other using connections between nodes.


Why we network

1. Communication

Communication network which uses broadcasting for communication between its nodes. They take messages from a single sender and transmit to all endpoints on the network

2. Share Resources

Shared resources refer to computer data, information, or hardware devices that can be easily accessed from a remote computer through a local area network (LAN) or enterprise intranet.

3. Share Data

Network sharing allows resources to be shared over a network, be they files, documents, folders, media, etc. These are made accessible to other users/computers over a network.

Also secondary reasons

1. Access control is easier

Network Access Control (NAC) is an approach to computer security that attempts to unify security technology (such as antivirus, host intrusion prevention, and vulnerability assessment), user or system authentication and network security enforcement.

2. Maintenance is easier

Network maintenance basically means you must do what it takes in order to keep a network up and running and it includes several tasks: Troubleshooting network problems. Hardware and software installation/configuration. Monitoring and improving network performance.

3. Work anywhere on network

Able to work anywhere on network as all machines have standard office install whereas some don’t.

1. Network formats

a.            Peer to Peer

Stored on individual pc but they can talk to other computers like sharing files without a centralized management source.

b.            Client server

A networking system in which one or more file servers provide services; such as network management, application and centralized data storage for workstations.

c.             Local Area Network – LAN

A network connecting computers in a relatively small area such as a building.

d.            Wireless Local Area Network – WLAN

Wireless local area network is a wireless distribution method for two or more devices that use high-frequency radio waves and include an access point to the Internet. It allows users to move around the coverage area, often a home or small office, while maintaining a network connection.

e.            Wide area Network – WAN

A network connecting computers within very large areas, such as states, countries, and the world.

Topology - 6 different types

a.            Linear Bus

A network topology in which each node attaches directly to a common cable.

b.            Star

Star in which each node on a network is connected directly to a central network hub or concentrator.

c.             Tree

Tree networks can contain branches with multiple nodes.

d.            Token Ring

A network protocol developed by IBM in which computers access the network through token-passing. Usually uses a star-wired ring topology.

e.            Wireless

Wireless topology is used to extend a wired LAN to include wireless devices. Wireless devices communicate with the wired LAN through a base station known as an access point or wireless access point.

Devices

a.            PC

A personal computer is a computer whose size, capabilities, and price make it feasible for individual use. PCs are intended to be operated directly by an end user, rather than by a computer expert or technician.

b.            Server

server is a computer that provides data to other computers. It may serve data to systems on a local area network (LAN) or a wide area network (WAN) over the Internet. Many types of servers exist, including webservers, mail servers, and file servers. Each type runs software specific to the purpose of the server.

c.             Printer

printer is a device that outputs from a computer and transfers the information to paper. Printers vary in size, speed and cost. In general, more expensive printers are used for higher-resolution colour printing.

d.            Hub

Hub is the basic networking device that connects multiple computers or other network devices together. A hub has no routing tables or intelligence on where to send information and broadcasts all network data across each connection.

e.            Switch

Switch is a computer networking device that connects devices together on a computer network by using packet switching to receive, process, and forward data to the destination device.

f.             Router

router is a device that forwards data packets along networks. It is connected to at least two networks, LANs or WANs or a LAN and its ISP's network. Routers are located at gateways, the places where two or more networks connect.

g.            Patch panel

Patch panel in a local area network (LAN) is a mounted hardware assembly that contains ports used to connect and manage incoming and outgoing LAN cables. Patch panels are also referred to as patch bays, patch fields or jack fields and are also commonly used in radio and television.

4.            Network Protocols- set of rules to carry out

a.            IP address

Numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.

b.            TCP

Transmission Control Protocol is a standard that defines how to establish and maintain a network conversation via which application programs can exchange data.

c.             MAC

Media Access Control is a unique identifier assigned to a network interface controller for communications at the data link layer of a network segment.

d.            FTP

File Transfer Protocol is used to transfer files between computers on a network.

e.            HTTP(s)

Hypertext Transfer protocol is the underlying protocol used by the World Wide Web and this protocol defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various commands.

f.             Bluetooth

A computing and telecommunications industry specification that describes how devices like phones, computers or personal digital assistants can communicate with each other. It is a peer to peer wireless network and it only works close to the device being used.

 


peacock photo

1.                   Bandwidth

Bandwidth is the amount of data that can be transmitted in a fixed amount of time. For digital devices, the bandwidth is usually expressed in bits per second (bps) or bytes per second. For analogue devices, the bandwidth is expressed in cycles per second, or Hertz. The faster it is transmitted the more data you get.

 

2.                    Wireless vs Hardwired

Hardwired is faster and more secure but you have to be close to the access point whereas wireless means you can be anywhere and still be connected.

3.                   Peer to Peer vs Client Server

A peer-to-peer network has no central server. However client servers can access most files, which are stored on the server.

 
   

Downloads

Network worksheets – pdf

1.            Network devices

2.            Network Terms

3.            Data Transmission

4.            Error Correction and Compression