Web technologies and operating systems

Июль 26, 2022

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Информатика
Web technologies and operating systems

Содержание

2. In this lesson main objective is Topic “The web and the internet” contrast the Internet, the
3. The Internet Topic “The web and the internet” The Internet is ? A worldwide interconnection of
4. Uses for the internet Topic “The web and the internet” WWW or HTTP Hyper Text Transfer
5. INTRANETS What is an intranet ? It is an internal website that is setup internally for
6. Connection to the internet - Hardware What do we need to connect to the internet ?
7. MODEM FM Frequency Modulation AM Amplitude Modulation Modulate a carrier signal into 1’s and 0’s. FM
8. ROUTER A router is a device that has an IP address. Computers can then connect to
9. SWITCH A switch is used to connect different network segments. A network segment is a set
10. A Network HUB A device that connects computers together and can link them all on to
11. Types of Line BROADBAND – Handles a broad band of frequencies (TV, Voice, Data) DSL is
12. Other ways to connect to the internet (HARDWARE) What is there ? Smart phone using 3G
13. ISP – Internet Service Providers What are they ? Who are they ? What do they
14. Software On The Internet What software can you think of do you use to access services
15. BROWSERS Browsers – These allow you to utilise HTTP and HTTPS to view the WorldWideWeb. What
16. FTP File Transfer Protocol is used to access websites via a different door to download files.
17. EMAIL Software that composes, sends and receives email Topic “The web and the internet”
18. Internet Security Risks ? What risks are there in using the internet Downloading Entering Personal Details
19. RISKS !!! Viruses, attack, hacking, identity theft, fraud, getting passwords, stealing bank details, intercepting emails, theft
20. RISK PREVENTION What do you need to do to minimise some or all of the risk
21. WHAT IS WEB? The Web (World Wide Web) consists of information organized into Web pages containing
22. COMPARE INTERNET AND INTRANET
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In this lesson main objective is
Topic “The web and the

internet”

contrast the Internet, the World Wide Web and an intranet

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The Internet
Topic “The web and the internet”
The Internet is ?
A worldwide

interconnection of computers and networks that use the protocol IP.
It allows for WWW, FTP, VoIP, Gaming, Filesharing, video, email.

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Uses for the internet
Topic “The web and the internet”
WWW or HTTP

Hyper Text Transfer Protocol
Email – Outlook, Yahoo, Googlemail
FTP File Transfer Protocol
Gaming
Video On Demand
Voice Over IP – Telephone Services
File Sharing

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INTRANETS
What is an intranet ?
It is an internal website that is

setup internally for companies and can be accessed by employees for the purpose of standard documents or information and many items of information and data.
INTERNAL WEBSITE WITHIN A COMPANY ACCESSED BY EMPLOYEES

Topic “The web and the internet”

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Connection to the internet - Hardware
What do we need to connect

to the internet ?

Computer or smart phone
Network hub if part of a network
A wireless enabled Router if using WiFi
ADSL or cable modem
An Internet Service Provider

Topic “The web and the internet”

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MODEM
FM Frequency Modulation
AM Amplitude Modulation
Modulate a carrier signal into 1’s and

0’s.
FM How Often
AM Loudness/Amplification

Topic “The web and the internet”

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ROUTER
A router is a device that has an IP address. Computers

can then connect to it using this address. It then forward links onto another communications device that can access the internet.

Topic “The web and the internet”

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SWITCH
A switch is used to connect different network segments.
A network segment

is a set of computers all connected together.
Like an intelligent hub.

Topic “The web and the internet”

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A Network HUB
A device that connects computers together and can link

them all on to another device.

Topic “The web and the internet”

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Types of Line
BROADBAND – Handles a broad band of frequencies (TV,

Voice, Data)
DSL is Digital subscribers line (Voice and data)
DIAL-UP is maximum of 56k (Data)
ISDN is Integrated Services Digital Network (Voice, Data, Video)

Topic “The web and the internet”

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Other ways to connect to the internet (HARDWARE)
What is there

Smart phone using 3G or 4g
USB ADSL dongle that connects to a service provider network

Topic “The web and the internet”

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ISP – Internet Service Providers
What are they ?
Who are they ?
What

do they do ?

An ISP sells Internet access to companies and individuals.
It provides web servers which connect to the Internet.
An ISP will provide it’s customers with a wide range of services…
Cable Television/Telephone services
Bandwidth options.
Email service.
Web Hosting.
Online and Telephone assistance.

Topic “The web and the internet”

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Software On The Internet
What software can you think of do you

use to access services on the internet ?

BROWSERS

Lime Wire – File Sharing

SKYPE

GAMING

FTP – File Transfer Protocol

SKYPE

OUTLOOK

FIREWALL

Topic “The web and the internet”

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BROWSERS
Browsers – These allow you to utilise HTTP and HTTPS to

view the WorldWideWeb.
What browsers are there ?
Internet Explorer
Mozilla Firefox
Netscape Navigator
Opera

Topic “The web and the internet”

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FTP
File Transfer Protocol is used to access websites via a different

door to download files.

Topic “The web and the internet”

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EMAIL
Software that composes, sends and receives email
Topic “The web and the

internet”

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Internet Security Risks ?
What risks are there in using the internet
Downloading
Entering

Personal Details
Online Banking
Buying Items Off The Internet
Sending Emails
Uploading Files

Topic “The web and the internet”

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RISKS !!!
Viruses, attack, hacking, identity theft, fraud, getting passwords, stealing bank

details, intercepting emails, theft of data, posting unwanted videos, posting unwanted text………..

Topic “The web and the internet”

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RISK PREVENTION
What do you need to do to minimise some or

all of the risk when accessing the internet ?
FIREWALL
VIRUS SCANNER
INSTALL ADWARE AND MALWARE SCANNERS
BE AWARE OF EMAIL SCAMS
BE CAREFUL WHEN USING PAYMENT SITES
BE CAREFUL DOWNLOADING AND UPLOADING
USE COMPLEX PASSWORDS

Topic “The web and the internet”

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WHAT IS WEB?
The Web (World Wide Web) consists of information organized

into Web pages containing text and graphic images.
It contains hypertext links, or highlighted keywords and images that lead to related information.
A collection of linked Web pages that has a common theme or focus is called a Web site.
The main page that all of the pages on a particular Web site are organized around and link back to is called the site’s home page.

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