Unit 4.2 - Data Transfer

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    Luis

    Cards (17)

    • Packets
      Data broken into smaller parts containing a header, message and footer. Protocols add data to the header and footer.
    • Simplex Transmission

      Data travels in one direction with no return packets; used in satellite connections for TVs
    • Half-Duplex Transmission

      Data may travel in both directions but not at the same time; used in walkie-talkies
    • Full Duplex Transmission

      Data can travel in both directions simultaneously by using separate cables for each direction so data cannot interfere with each other
    • Define Routing

      Method of selecting paths to send packets along in a network
    • Routing Methods
      Devices search for the fastest node and shortest route; network hardware construct routing tables that store the potential paths; forwarding tables store costs for a destination and the first node it must travel to.
    • Bandwidth

      A measure of the amount of data that can fit on a cable at any time; data flows at the same speed regardless of bandwidth
    • Bit rates

      A way of expressing bandwidth when describing software requirements
    • Text Based Emails

      Only a few kilobytes in size; low transmission rates
    • Streaming
      Videos send large amounts of data in short time periods; high transmission rates
    • File Server
      Handles many requests simultaneously and aims to respond as fast as possible; high transmission rates
    • Web Browsing
      Typically small in size and data is transferred over a long period of time; low transmission rates
    • Instant Messaging
      Text based, real time communication between two or more people; can be encrypted; multimedia may be sent
    • Blogs
      A regularly updated website containing commentaries on topics; Reverse chronological order
    • Webcasts
      Broadcasts that are distributed across the internet; A single content source is distributed to many viewers/listeners; can be live or on-demand
    • Podcasts
      Video/Audio files released as part of a series; can be syndicated to allow other podcast directories to display your content; uses an RSS feed to update content
    • The internet

      Large infrastructure of interconnected packet switched networks; Provides infrastructure for both WWW and non-WWW applications; consists of network hardware communicating through TCP/IP
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