intro to network

8/8/2019 Intro to Network

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INNSWOOD HIGH SCHOOL Information Technology

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Objectives:

W hat is a networkW ho uses a network

Advantages of a networkDis-Advantages of a network

Types of Network

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Wha t is Network?

A network is a connection of two or morecomputers that share information andresources.

These resources can be:

1. Hardware

2. Software3. Information

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Wh o uses a network?

B ecause of the wide range of uses for a network,we all use a network in some point in ourlives. Networks are used by:

1. B usiness persons to keep track of and conductbusiness transactions

2. Students- to do research3. Scientist - to share information around the world4. Everyday persons to send and receive information. . . Even the simple task of talking on the phone is

using a network.

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Ad v a nt ag es of a network

1. Persons may share information with personsaround the world in only a matter of seconds.

2. Hardware resources can be shared eg: in anoffice, one printer may share for numerouspersons.

3. Cheap and reliable means of sharinginformation.

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D is a d v a nt ag es of a Network

1. Information on a computer may becomeunsecure due to hackers.

2. Viruses are spread easily3. Expensive to install

4. Requires specialized persons to operate and

maintaine a network system.

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Typ es of Network

There are two main types of network:Local Area Network ( LAN): This network is set up with a

small or localized area such as an office or home. It is set

up to satisfy the needs of the persons within thatnetwork by allowing them to share resources.Wide Area Network (WAN): This network connects

computers over a wide area such as a community,country, or across the world. A W AN may be created byconnecting several LANs

The largest Network in the world is known as the Internet .

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L oc al A re a Network ( L A N)

Home or Office

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WI DE AR E A N ET W O RK ( W A N)

Across the world

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Network a n d Communic a tion

Data Types

Transmission Media

Transmission Directions

Transmission Speed

Transmission Mode

Network Topologies

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T r a nsmission Me d ia s

Transmission Media refers to the means thatdata can take to be transmitted across anetwork.

Data can be transmitted across two mediums ormedias:

1. W ired or Cable

2. W ireless

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W ire d or C a b l e d T r a nsmission

This is a physical means of transmitting data byconnecting a cable to the ends of the deviceson the network.

A Cabled connection provides a secure anddirect means of transmitting data.

Three types of Cables are:

1. Twisted Pair2. Coaxial Cable3. Fiber Optic Cable

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Twisted Pair

This is a transmission media most commonly usedas telephone lines. It involves the twisting of pairs of wires to form the cable. This twistingmakes the wires more resistant to interference.

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Co ax ial C a b l e

This is a thicker more ridged cable often used toconnect cable TV. This cable can also be usedto carry data across a network. (The cable TVcan also be considered a network as itconnects devices together to share data.

protective rubber insulator copper wire

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F iber O p tic C a b l e

This cable does not contain any metallic wires. Itcontains strands of glass. Data is transmittedthrough this cable by means of a light beamrunning through the glass strands. This is thelatest technology in cable transmission.

protective rubber insulator Glass trand

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W ire l ess T r a nsmissionMe d ia

W ireless transmission medias involvestransmitting data across a medium withoutthe use of cables. Data that is transmittedwirelessly can be transmitted further and toa wider audience.

Two main types of wireless medias are

1. Microwave Transmitters

2. Satellites

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A ssi g nments

1. Assignment #1

2. Assignment #2

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Transmission Direction

Data flowing through a network can flow indifferent directions depending on its purpose.

Simplex Half Duplex

Full Duplex

O ne direction O nlyBoth directions but not at

the same time

Both directions at thesame time

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C la ss A ssi g nment #1

1. In your own words, describe what is anetwork and how can it be useful to you.

2. Draw a diagram showing a LAN and aW

AN.

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A ssi g nment#2

1. W hat is a network?2. Describe one area in your life that can be compared to a

network.3. Differentiate between LAN and W AN4. In your own words why is the internet considered a

network.5. W hat are the benefits to being connected on a network6. Describe two wired means of connecting devices on a

network.7. Describe two wireless means of connecting devices over a

network.

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S imple Networking Video

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Innswoo d H igh Sc h oo lInform a tion T ec h no l o g y

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