networks – wans and lans

8/14/2019 Networks – WANs and LANs

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Networks – WANs and

LANsCranford House Year 10

Mr Sharland



Lesson Objectives• Discuss what is the difference

between LANs and WANs•

Discuss some of the devices used inLANs and WANs• Discuss the purpose of LANs and

WANs



The First Networks!

Sneakernet!



What sort of problemswould Sneakernet have?

Take toolong?

Reliable?

Limit todata

amount?

Distance?

Compatible?

Solution?

Connect thecomputers

together with anetwork



Activity 1:Open this PowerPoint

on your computers andusing the table on thenext slide list all the

types of networks you

can think of on the left



List as many different networksyou can think of

Types of Networks LAN or WAN

Eg: Mobile Phone Network



LAN or WAN?LAN

Local AreaNetwork

A network whichcovers a small

physical areasuch as a homeor business

WAN

Wide AreaNetworkA network whichcovers a largerphysical area

such as abusiness withmultiple sites

So! Go Back to the previous slide and now add on the right handside whether the networks you have listed are LANs or a WANs



List as many different networksyou can think of

Types of Networks LAN or WAN

Mobile Phone Network WAN

Telephone Network WAN

School Computer Network LAN

Home Computer Network LANCash Machine Network WAN

Bluetooth to Mobile Phone Network LAN

Games Console Network WAN

TV and Remote Control LAN



What do you need to

create a network?



You need devices ...

Devices

Switch

Networked

Computer

Server

Modem/Rou

ter

TIP: For the activity to find out anything about these items click on them



A means for them tocommunicate ...

Communication (Network

Media)

FibreOptic

Wi-Fi

Bluetooth

Ethernet

TIP: For the activity to find out anything about these items click on them



A company to manage yourconnection

Telephone SystemRouter ISP



House Task• Instructions

– Bob wants to connect a brand newcomputer and laptop at home to theinternet

– On the next slide drag the objects fromthe right hand side of the screen to form

a network connecting Bob’s two devicesto the Internet



Ethernet

Wi-Fi

Phone Line



How are WANsconstructed?

Rely onRouters to

manageflow of data

WANs usemultipleconnection

methods

ConnectLANs

together

VeryComplexNetworks

Telephonesystem toAdvancedSatellitecomms



is is a visualisation of the Internetch line represents a connection to a router

From 2005

and onlyshows

roughly 30%of the

Internet



e visualisations only show part of the Netalso become instantly out of date as soon as they are created



The Internet isessentially a seriesof largeinterconnectedWANs which form amassive planet wideWAN



Plenary -What is a LAN?

-What is a WAN?

-How are theydifferent?

-What devices canbe used to connecta WAN and LAN?

-What is an ISP?

-What is thepurpose of a LAN?

-What is thepurpose of a WAN?



THANK YOU!

Please add a comment on what you learnt on your post-it note



Networked Compute r• A networked computer contains a

network card• The network card allows it to connect

to a network either: – Through an Ethernet cable or ... – Through Wi-Fi

• The operating system on the computeralso has software to manage itsconnection to the network

Back to Devices



Switch• A switch is a device into which

Ethernet cables from individualcomputers are connected

– Each computer has their own Ethernetcable

• This means multiple computers cannow communicate with each otheracross a network

Back to Devices



Modem / Router• A Modem (also known as a Router) is

an intelligent device which managesthe connection between a LAN and aWAN

• Only one router will normally berequired for a small LAN to connectto a WAN through the telephonesystem

Back to Devices



Server• A server is a more powerful and

capable computer which is used tomanage a network

• Some servers do multiple jobswhereas other servers do specific jobssuch as managing

– Printing (Print Server) – Email – Websites (Web Server)

Back to Devices



Wi-Fi• Wi-Fi is a technology used to connect

multiple devices to the internet throughradio waves

• These radio waves are produced by aWi-Fi router such as commonbroadband routers found in homes

• They have limited ranges• They are suitable for situations where

you need to move aroundBack to Communication

methods



Fibre-Optic Cable s• Fibre-Optic cables are made using

special glass fibre• Data is sent through these cables in the

form of light• It has a much higher bandwidth

(amount of data which can be sentthrough a connection)

• It is very expensive and used more forlong distance networks or where thereis a lot of data to transmit

Back to Communicationmethods



Bluetooth• Bluetooth is a form of radio wave

transmission• Data is transmitted across very short

distances between small devices• Used for simple tasks like connecting

a headset to a mobile phone• Or connecting a wireless keyboard to

a computer

Back to Communicationmethods



Ethernet Cabl e• Ethernet cables are standard network

cables used for connecting computersin a LAN

• Each ethernet cable from a computerwill be connected to a switch

• Ethernet cables do not have as muchbandwidth as fibre-optic cableshowever they are sufficient for normalusage

Back to Communicationth d

networks – wans and lans

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