WWW(PPT 1)

• World Wide Web


  The leading information retrieval service of the internet
• World Wide Web


  • Gives user access to a vast array of documents that are connected by means of hyperlinks
• Hyperlinks


  Electronic connections that link related pieces of information to allow easy access for the user
• Hyperlinks


  A word, phrase, or image that you can click on to jump to a new document or a new section within the current document
• Classifications of Hyperlinks

  • Hypertext
  • Hypermedia
• Hypertext


  Allows user to select a word from text and thereby access other documents that contain additional information pertaining to that word
• Hypermedia


  Hyperlink involving media, documents feature links to images, sound, animation, and movies
• Tim Berners-Lee


  British scientist who invented the World Wide Web
• Birthday of www


  1989
• CERN


  European Council for Nuclear Research, where the web was invented/born
• HTTP


  Hypertext Transfer Protocol, standardized communication between servers and clients
• Types of Websites

  • Static Website
  • Dynamic Website
• Webpage


  What you see through your browser by scrolling the window up and down
• Website


  A group of webpages linked together
• Browser


  A software application used to enable computer users to locate and access web pages
• HTML (Hypertext Markup Language)


  The basic code that allows us to see images, text, videos and listen to audios on websites, along with the hyperlinks that allow us to travel to different web pages
• URL (Uniform Resource Locator)


  Has 3 basic parts: protocol, server name, and resource ID
• Static Website


  Contains information that does not change
• Dynamic Website


  Can contain client side scripting or server side scripting to generate changing content
• IP Address


  Takes the form of a dotted-quad number such as 128.175.13.92
• IP Address is something an internet/server cannot have at the same time
• HTML STANDSS FOR?

  HYPERTEXT MARK UP LANGUAGE
• Hypertext Markup Language (HTML): A markup language used to create web pages.
• HTTPS stands for HyperText Transfer Protocol Secure.
• HTTPS stands for HyperText Transfer Protocol Secure.
• JavaScript is a programming language commonly used on websites to add interactivity and functionality.
• Computer Networks


  A group of two or more computers linked together
• Basic Network Components

  • Server
  • Client
  • Media
  • Network Adopter
  • Resources
  • User
  • Protocols

  
• Local Area Network (LAN)


  • Connects network devices over a relatively short distance
• Wide Area Network (WAN)


  • Provides long distance transmission of data, voice, image, and video information over large geographical areas
• Peer to Peer (P2P) network architecture


  • Each party has the same capabilities and any party can initiate communication

  
• Client-Server network architecture


  • Computers are classified as either servers or clients

  
• Types of Computer Network Topology

  • Point to Point
  • Mesh
  • Star
  • Bus
  • Ring
  • Tree
  • Hybrid

  
• Network Bandwidth


  The amount of data that can be transmitted between 2 points in the network in a set period of time, commonly expressed in bits per second
• Internet


  A global system of interconnected computer networks that use the standard internet protocol suite (TCP/IP) to serve several billion users worldwide
• Basic Applications of the Internet

  • Communication
  • Job Searches
  • Finding books and study material
  • Health and medicine
  • Travel
  • Entertainment
  • Shopping
  • Stock market updates
  • Research
• TCP/IP Applications


  The highest-level protocols within the TCP/IP protocol stack that communicate with applications on other internet hosts and are the user-visible interface to the TCP/IP protocol suite
• Components for getting connected to the Internet

  • Computer
  • Modem (dial-up, DSL, cable)
  • Internet Service Provider (ISP)
  • Software
• Star Topology


  • All hosts are connected to a central device known as HUB DEVICE using a point to point connection
  • If hub device fails, all devices won't function anymore
• Ring Topology


  • Each host/machine connects exactly to two hosts
  • To send data to host 3, it needs to send data to a host that is connected to host 3