comradm2

• World Wide Web (WWW)


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


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


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

  • Hypertext
  • Hypermedia
• Hypertext


  Allows the 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, sounds, animations, and movies
• World Wide Web (WWW)


  • Begun in 1989 by Tim Berners-Lee and his colleagues at CERN
  • They created HyperText Transfer Protocol (http), which standardized communication between servers and clients
• Webpage


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


  • Composed of a group of webpages linked together
  • Static Website - contains information that does not change
  • Dynamic Website - can contain client side scripting or server side scripting to generate changing content
• Web browser


  • Software application used to enable computer users to locate and access web pages
  • Translates the basic HTML (Hypertext Mark Up Language) code that allows us to see images, text, videos, and listen to audios on websites, along with hyperlinks that let us travel to different web pages

  
• URL (Uniform Resource Locator)


  Consists of 3 basic parts: Protocol, Server name, Resource ID
• IP address


  • Takes the form of a dotted-quad number, such as 128.175.13.92
  • No other computer/server on the same network or on the internet can have the same IP address at the same time
• WORLD WIDE WEB (WWW)

  • Is the leading information retrieval service of the internet.

  • The web gives user access to a vast array of documents that

  are connected to each other by means of hyperlinks.
• Computer Networks


  • A group of two or more computers linked together

  
• Basic Network Components

  • Server
  • Client
  • Media
  • Network Adopter
  • Resources
  • User
  • Protocols
• BASIC TYPES OF COMPUTER NETWORKS

  • Local Area Network (LAN)
  • Wide Area Network (WAN)

  
• 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
• 2 Types of Computer Network Architecture

  • Peer to Peer (P2P)
  • Client – Server Architecture

  
• Peer to Peer (P2P)


  Each party has the same capabilities and any party can initiate communication
• Client – Server Architecture


  Computers in this model are either classified as server or clients
• Node


  Each client or server in the network may also be referred to as node
• Types of Computer Topology

  • Point to Point
  • Mesh Topology
  • Star Topology
  • Bus Topology
  • Ring Topology
  • Tree Topology
  • Hybrid Topology
• The geometric arrangement of a computer system is referred to as TOPOLOGY
• Network Bandwidth is the amount of data can be transmitted between 2 points in the network in a set period of time
• Network Bandwidth is 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
  • The internet contains billions of web pages created by people of companies from around the world, making it a limitless location to locate information and entertainment
  • The internet also has thousands of services that help make life more convenient
• Basic Application of Internet

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


  • Telnet
  • File transfer protocol (FTP)
  • Simple mail transfer protocol (SMTP)
• 4 main components to getting connected to the Internet

  • Computer
  • Modem – dial-up, DSL, cable
  • Internet Service Provider (ISP)
  • Software
• Web Browser/Internet Browser


  A software application for retrieving, presenting, and traversing information resources on the World Wide Web
• 3 common types of modem connections

  • Dial-up
  • DSL
  • Cable