s3 computer literacy l.
Skip this Video
Loading SlideShow in 5 Seconds..
S3 Computer Literacy PowerPoint Presentation
Download Presentation
S3 Computer Literacy

Loading in 2 Seconds...

play fullscreen
1 / 28

S3 Computer Literacy - PowerPoint PPT Presentation

  • Uploaded on

S3 Computer Literacy Internet Technology Connecting to the Internet – Hardware Requirement MODEM 56K or Broadband MO dulation and DEM odulation Telephone Line Connecting to the Internet - ISP ISP – Internet Service Provider( 互聯網服務供應商 ) What has ISP done for you?

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

S3 Computer Literacy

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
s3 computer literacy

S3 Computer Literacy

Internet Technology

connecting to the internet hardware requirement
Connecting to the Internet – Hardware Requirement
    • 56K or Broadband
    • MOdulation and DEModulation
    • Telephone Line
connecting to the internet isp
Connecting to the Internet - ISP
  • ISP– Internet Service Provider(互聯網服務供應商)
  • What has ISP done for you?
    • It sends and receives data for you.
    • It provides a connection between you and the other of the Internet.
    • As shown in the animation below, the data is in fact handled by a number of ISP.

Animation for connection to the Internet

is isp running the internet
Is ISP running the Internet?
  • No single organization runs the Internet.
  • It is a large network of networks.
  • These networks are linked by high-speed communication channels called backbones.
  • Each Internet computer, called a host, is independent.
connecting to the internet type of access
Connecting to the Internet –Type of Access
  • Dial-up Access(撥號上網)
    • It needs
      • a telephone line
      • MODEM
    • User
      • dials a telephone number given by the ISP to connect to the server of the ISP.
      • a user name and password to authenticate the user.
      • User can access hosts on the Internet
    • Data transfer rate maximum of 56Kbps.
connecting to the internet type of access6
Connecting to the Internet –Type of Access
  • Broadband Access
    • Its speed is measured in Mbps (i.e. Mega bit per second)
    • Unlike dial-up access, it requires a network card / LAN card but no modem required.
broadband access adsl
Broadband Access - ADSL
  • ADSL
    • a technology for transmitting digital information at a high bandwidth on existing phone lines to homes and businesses.
    • ISP adopting this technology in HK:
      • Netvigator (網上行)
get to the internet
Get to the Internet
  • PPPoE
    • Some broadband Internet service providers (ISPs) identify your computer on their networks using Point to Point Protocol over Ethernet (PPPoE). If your ISP requires you to supply a name and password to access the Internet, it most likely uses this protocol (議定 ).
broadband access adsl9
Broadband Access - ADSL
  • ADSL (Asymmetric Digital Subscriber Line)
    • Asymmetric (不對稱) between download speed is faster.
    • Download Speed – 1.5Mbps to 8Mbps
    • Upload Speed – 16Kbps to 640Kbps
    • Components – Network card, ADSL MODEM, Telephone Line
broadband access cable tv network
Broadband Access –Cable TV Network
  • Cable TV Network
    • A Cable MODEM is used to enables user to connect the PC to a local cable TV line and receive data at about 10Mbps.
    • ISP adopting this technology in HK:
      • iCable (有線寬頻)
broadband access cable tv network11
Broadband Access –Cable TV Network
  • Cable TV Network
    • Download and upload speed are the same, but the bandwidth (10Mbps) is shared among users at the same location(e.g. the same building)
    • Hardware used – Network Card, Cable MODEM
broadband vs dial up access
Broadband vs Dial-up Access
  • Faster connection speed – up to 1.5Mbps to 10Mbps.
  • No dialing required.
  • Simultaneous use of data and voice connections
    • ie: unlike dial-up access, user can talk on the phone while surfing the Internet.
how can we share internet access in a lan to a broadband
How can we share Internet access in a LAN to a Broadband?
  • A router(路由器) is needed to connect a LAN to the Internet.
  • It will share the broadband access from one Internet account among all users in the LAN.
communication protocol tcp ip
Communication Protocol – TCP/IP
  • TCP/IP
    • communication protocol of the Internet
    • set of rules used in message transmission on the Internet.
    • computers need to use the same protocol if they need to communicate
advantages of tcp ip
Advantages of TCP/IP
  • If we send the whole file without breaking it into packets,
    • the whole message then has to be re-sent if the full message fails to reach its destination
    • if it is broken down into packets, then only the packet that fail to be sent are resent.

Packet Animation

advantages of tcp ip17
Advantages of TCP/IP
  • Transmission of data is not affected by the failure of any path:
    • there are more than one path. Packets of data can be routed around the problem.
    • the load of the line is evenly distributed.
  • As long as the operating system supports TCP/IP, the computers can communicate through LAN and Internet.

TCP Animation

ip address
IP Address
  • It identifies every host (computer) in any network.
  • When a packet is transmitted over the Internet, it must carry the addresses of the sender and receiver computers so that the routers can choose the best path.
ip address format
IP Address – Format
  • The IP address system currently using is called the IPv4 addressing system.
question regarding ip address
Question regarding IP Address
  • What is the range of the each set of numbers?
  • As each computer in the Internet has a unique IP address, how many computer can be represented in the Internet?
  • What can we do if the number of IP addresses is not enough?
real ip and virtual ip
Real IP and Virtual IP
  • Imagine if there are not enough IP addresses in a network, what can we do?
  • The solution is to use Virtual IP.
how virtual ip works
How Virtual IP works
  • Some of the IP addresses are reserved for private network (ie: LAN). E.g. 10.X.X.X or 192.168.X.X
  • The router will not route these IPs to the Internet, ie: it will route the data sending to these IPs inside the LAN.
static ip and dynamic ip
Static IP and Dynamic IP
  • Static IP
    • IP addresses that are fixed every time when the user connect to the Internet.
  • Dynamic IP
    • IP addresses that changes every time the user connect to the Internet.
domain name system dns
Domain Name System (DNS)
  • At the command window, type in the command “ping www.google.com.hk”, what did you find? Why?
  • To connect to a specific computer, we need to know its IP address.
  • Connect to the Yahoo! webpage, we need to know its address, ie: type in the Internet browser.
  • It is inconvenient to remember the meaningless IP address.
dns server
DNS Server
  • DNS Server responsible for translating the address into the corresponding IP address.
  • Try to get to the nba.com
web server
Web Server
  • Web Server is a computer that delivers Web pages.
  • A computer can become a web server by installing Web Server Program like Apache and IIS (Internet Information Server)
web browser
Web Browser
  • A software application used to display Web pages.
  • Two most popular browsers are Netscape Navigator and Microsoft Internet Explorer (IE).
  • Plug-in (外掛程式)
    • The browser cannot play all format of audio or video files, so a plug-in program is needed to add support to these types of files.
case studies
Case studies
  • If the hosts (PCs) can communicate well in the LAN but they have difficulties to get to the Internet, what would be the problem?
  • If you are a teacher and you have saved some document in a PC at school. You have checked the IP address of this PC is, are you able to get access to this PC at your home, why?
  • Your PC at home cannot access to the web pages, e.g. www.yahoo.com.hk, however, your ISP tells you that your connection to the Internet works fine, what would be the problem?