Sunday, 23 April 2017

WEB SEARCHING
  • are Web sites designed specifically to help you find information on the Web.
  • such as, Google, Bing, Yahoo! Search, Ask.com, and etc

Categories Web Searching

- there are four types :
  1. Directories - a type of Internet search where categories are selected to locate information on the Internet.
  2. Search engines - a software program used by a search site to retrieve matching Web pages from a search database.
  3. Meta-search engine - is a search tool that uses another search engine's data to produce theis own result from the Internet. It can take input from a user and simultaneously send out queries to third party search engine for result.
  4. Yellow pages - contain iformation about business
DIRECTORIES
META SEARCH
SEARCH ENGINES
YELLOW PAGES


 there are some video that you can watch. :)

https://www.youtube.com/watch?v=SkKC1BnuQsE
https://www.youtube.com/watch?v=R0DQfwc72PM
https://www.youtube.com/watch?v=7RlB1CJovTs
https://www.youtube.com/watch?v=tJQo_pw74ZY
https://www.youtube.com/watch?v=_GVfKWDhsto

Tuesday, 11 April 2017

INTERNET INFRASTRUCTURE

Internet - the largest & most well-known computer network, linking millions of computers all over the world.

Hierarchy Of Networks
  1. from a single computer to LAN.
  2. from LAN to ISP.
  3. from ISP to WWW.
PICTURE 1: Hierarchy of network.

there is a video that you can watch :)
https://www.youtube.com/watch?v=4C1dDaftt0c&t=24s
Internet Service Provider (ISP)
  • a business / other organization that provides Internet access to others, typically for free.
  • ISPs include most communications & media companies, such as conventional & wireless phone providers, cable providers & satellite provider
PICTURE 2: Example of ISP.

Internet Protocol (IP)
  • the language that computer use to communicate over the Internet.
Internet Protocol Address (IP Address)
  • a numeric Internet address used to uniquely identify a computer on the Internet.
  • commonly used by computers to refer to others computers.
  • are numeric such as 207.46.197.32
PICTURE 3: IPv4 address


PICTURE 4: IPv6 address

Domain Name
  • a text-based Internet address used to uniquely identify a computer on the network.

PICTURE 5 : Example of domain name


Hyper Text Transfer Protocol (HTTP)
  • how messages are formed & transmitted, and what actions Web servers & browsers should take in response to various commands.
  • examples, when you enter a URL in your browser, this actually sends an HTTP  command to the Web server directing it to fetch & transmit the requested Web page from a Web server onto a browser in order to view a Web page that is on the Internet.
  • HTTP only transfers the contents of a web page into a browser for viewing.
Type of Internet connection
  1. Dial-up connection - a type of Internet connection in which the computer or other device must dial-up and connect to a service provider's computer via telephone line before being connected to to the Internet.
  2. Direct connection - a type of Internet connection in which the computer or other devices is connected to the Internet continually.
  3. Conventional dial-up Internet access - dial-up Internet access via standard telephone lines.
  4. Cable Internet access - fast, direct Internet access via cable TV lines.
  5. DSL (Digital Subscriber Line) Internet access - fast, direct Internet access via standard telephone lines.
  6. Satellite Internet access - fast, direct Internet access via the airwaves and a satellite dish.
  7. Fixed wireless Internet access - fast, direct Internet access available in some areas via the airwaves.
  8. Broadband over fiber (BoF) Internet access - very fast, direct Internet access via fiber-optic networks, also refered as fiber-to-the-premises (FTTP) Internet access.
  9. WiFi hotspots - a location that provides wireless Internet access to the public.
PICTURE 6 : Type of Internet connection.