1. WHAT IS A NETWORK TYPES OF NETWORK NETWORK HARDWARE

2. WHAT IS A NETWORK
A network is a group of connected computers that allow people to share information and equipment, such as printers
A network is a group of connected computers that allow people to share information and equipment, such as printers

3. Creating a Network
A network can be any size. For example, a small business can create a network by connecting as few as two computers for sharing files
A network can also connect millions of computers to exchange information all over the world . the world largest network is the internet

4. Logging On
Network users are usually required to identify themselves before they can gain access
Each user must enter a personalized login name and password to access a network
Network users are usually required to identify themselves before they can gain access to the information on a network. This is known as logging on
Each user must enter a personalized login name and password to access a network by keeping this information secret, user can prevent unauthorized people from accessing the network

5. Network Advantages
Sharing information : information can be any form of data, such as a document created in a word processing program or information provided by a database
You can use a network to exchange information with other people, information can be any form of data, such as a document created in a word processing program or information provided by a database

6. Sharing resources :
Computer connected to a network can share equipment and devices, called resources.
Sharing program:
Networks also allow people to access a copy of a program stored on a central computer
Computer connected to a network can share equipment and devices, called resources. The ability to share resources reduces the cost of buying computer hardware. For example, instead of having to buy a printer for each person on a network, everyone can share one central printer.
Sharing program
Networks also allow people to access a copy of a program stored on a central computer, such as a spreadsheet or word processing program. Individuals can use their own computers to access and run the programs. By sharing programs, a company can avoid having to install a copy of the program on each person’s computer.

7. Working together: The computers on a network are less expensive and make it easier to complete complicated tasks Communication: Networks allow people to communicate and exchange message with each other easily and efficiently
Working together
Before computer networks, many companies used one large, expensive computer to perform complex tasks. Now most companies use a network with several smaller computers. The computers on a network are less expensive and make it easier to complete complicated tasks
For example multiple computers can be set up to help keep track of sales. One computer can process orders, another computer can keep track of inventory and the last can arrange the delivery.
Communication
Networks allow people to communicate and exchange message with each other easily and efficiently. Communicating with the other people on a network is especially useful when people are working together on the same project. Messages are often delivered within seconds of being sent.
Using a network also make it possible to hold meeting with people in another office or even on the other side of the world.

8. TYPES OF NETWORK
There are many different types of networks used by businesses and organizations. Since each business and organization has its own needs, each network is unique.
There are many different types of networks used by businesses and organizations. Since each business and organization has its own needs, each network is unique.

9. Network cost :The size and type of a network determine its cost.
Network size : The size of a network can often determine which type of network a business or organization should use.
Network cost :The size and type of a network determine its cost.
Network size
The size of a network can often determine which type of network a business or organization should use. Different sized network transmit data in different ways.
For example, a network with over 1000 users is organized differently and requires a variety of components not found on a network with only five users
Network cost
The size and type of a network determine its cost. The larger the network, the more costly the network is to build, set up and maintain
In addition to needing extra hardware and cables, a large network also requires specialized cabling and computers to link users and devices that are far apart.

10. Local Area Networks (LAN)
A Local area network (LAN): Local area networks connect computers and devices located close to each other, such as in one building
Metropolitan area networks
A metropolitan Area Network(MAN) is a collection of local area networks.
Local Area Networks (LAN)
A Local area network (LAN) is the most common type of a network found in businesses. Local area networks connect computers and devices located close to each other, such as in one building. Usually , local area connects no more than 100 computers.
Metropolitan area networks
A metropolitan Area Network(MAN) is a collection of local area networks. Metropolitan area networks connects computer located in the same geographic area, such as a city or town

11. Wide Area Networks
A wide area network(WAN) connects local and metropolitan area networks together. The networks that make up a wide area network may be located throughout a country or even around the world.
Wide Area Networks
A wide area network(WAN) connects local and metropolitan area networks together. The networks that make up a wide area network may be located throughout a country or even around the world. When a single company owns and controls a wide area network, the WAN is often referred to as an enterprise network.

12. Network Hardware
Network hardware includes the physical components that make up a network. All networks requires special network hardware
Network Hardware
Network hardware includes the physical components that make up a network. All networks requires special network hardware

13. The most important job of a network is to link computers together.
Resources
A network resource is any device computers on a network can use.
Cables
Cables are the wires that connect computers and resources on a network
Computers
The most important job of a network is to link computers together. When computers are linked, the people using the computers can work more efficiently. computers connected to a network do not have to be the same type. Many networks contain different types of computers, such as IBM, and Macintosh .
Resources
A network resource is any device computers on a network can use. The most common type of resources is a printer. All of the people on a network can send documents to a printer that is connected to the network. Other examples of network resources include fax machine, tape backup units and file storage devices, such as hard drives
Cables
Cables are the wires that connect computers and resources on a network. Many different kind of cables can be used, Depending on the type and size of the network. The type of cable used often determines how quickly information will transfer through the networks, many miles of cable may be required.

14. Connectors A connector is any devices that join two networks together
Connectors A connector is any devices that join two networks together. Network interface cards A network interface card (NIC) is a device that joins a cable to a computer.
Connectors
A connector is any devices that join two networks together. When two networks are connected, all the computers on both networks can exchange information. The most common type of connector is called a bridge.
Network interface cards
A network interface card (NIC) is a device that joins a cable to a computer. Most network interface cards are installed inside a computer. The edge of the card can be seen at the back of the computer. An NIC has a port where the network cable can plug in

15. Network software
Network software consists of the programs run by computers connected to a network.

16. Network Operating System
The most important software on a network is the network Operating System (NOS).
Network Drivers
A network driver is the software on a computer that allows the computer to use a network interface card to communicate with the network.
Network Operating System
The most important software on a network is the network Operating System (NOS). The NOS organize and manages all the activities on a network.
On most networks, one central computer is usually responsible for running the network operating system
Network Drivers
A network driver is the software on a computer that allows the computer to use a network interface card to communicate with the network.

17. Server software enable the server to perform a specific task.
Application Software
Application software consists of the software that runs on computers connected to a network.
Server software
Server software enable the server to perform a specific task.
Management software
Management software allows network administrator to organize and manage a network more efficiently.
Application Software
Application software consists of the software that runs on computers connected to a network. Application software includes word processors, spreadsheet and drawing programs. Application software can be stored on each computer connected to the network or on a central computer that is used only for storing application software.
Server software
A server is a computer that makes information and resources available to other computer on a network. Server software enable the server to perform a specific task. For example, mail server software allows the server to process . The server software must be compatible with the network operating system.
Management software
Most networks that connect more than 20 computers usually run special management software. Management software allows network administrator to organize and manage a network more efficiently.