INTERNET INFRASTRUCTURE
Internet - the largest & most well-known computer network, linking millions of computers all over the world.
Hierarchy Of Networks
- from a single computer to LAN.
- from LAN to ISP.
- from ISP to WWW.
PICTURE 1: Hierarchy of network.
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.
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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
- 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.
- Direct connection - a type of Internet connection in which the computer or other devices is connected to the Internet continually.
- Conventional dial-up Internet access - dial-up Internet access via standard telephone lines.
- Cable Internet access - fast, direct Internet access via cable TV lines.
- DSL (Digital Subscriber Line) Internet access - fast, direct Internet access via standard telephone lines.
- Satellite Internet access - fast, direct Internet access via the airwaves and a satellite dish.
- Fixed wireless Internet access - fast, direct Internet access available in some areas via the airwaves.
- 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.
- WiFi hotspots - a location that provides wireless Internet access to the public.
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PICTURE 6 : Type of Internet connection. |