1.3

• Circuit Switching:

  • A method of sending data over a wide area network (WAN)
• Client-Server:

  • A networking architecture
  • A client makes requests to a server for data and connections
  • A server controls access and security to one shared file store.
• DNS (Domain Name System):

  • Made up of multiple domain name servers
  • Maps a domain name in a URL to an IP address.
• Encryption:

  • Encoding data called plaintext into unreadable data called ciphertext using a key.
• Firewall:

  • Used in a network to prevent external users gaining access to a computer system or network.
• Local Area Network (LAN):

  • Covers a small geographical area
  • All hardware for the LAN is owned by the organisation using it.
• Packet Switching:

  A method of sending data over a wide area network in which the message is split into a number of smaller packets that are sent independently and reassembled at the destination.
• Peer to Peer:

  • Type of network where all computers on the network are equal
  • Computers share their files with each other
  • Each computer is responsible for their own security and backup
• Protocol:

  • A set of rules for how devices communicate.
• Proxy:

  • Controls the access of authorised users to data.
• Transmission Control Protocol / Internet Protocol (TCP/IP):

  • TCP provides an error free transmission between two routers.
  • IP routes the packets across a wide area network (WAN)
• Wide Area Network (WAN):

  • A collection of computers on the same network which are spread out over a large geographical area
  • Structure is hired from telecommunication companies who own and manage it.
• Client Side Processing:

  • Operations that are performed by the local device in a client-server relationship in a computer network
• CSS:

  • Cascading Style Sheet
  • A definition of the formatting and layout of element of an HTML document
• HTML:

  • HyperText Markup Language
  • Language used to create web pages.
• Javascript:

  • A programming language used to create interactive elements on web pages.
• PageRank algorithm:

  • An algorithm used by google search to rank websites in their search engine results
  • Works by counting the number and quality of links to a page and determine a rough estimate of how important the website is.
• Search Engine Indexing:

  • A crawler/spider looks at each page on a website
  • Examining meta data in headers and words within the page adding them to a database to be used for searching
  • Deciding on the importance of the page
• Server Side Processing:

  • Operations that are performed by the server in a client-server network