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  • Created by: Jostef
  • Created on: 30-04-18 10:31
View mindmap
  • stuipid
    • Network Topologies
      • Star Network
        • advantages
          • if one device goes offline, the others are not affected
        • disadvantage
          • Can be very expensive to scale
      • Mesh Network
        • advantages
          • There does not have to be a central server
        • disadvantages
          • security is not centralised.
    • Wi-Fi
      • frequency
        • 2.4 GHZ
        • 5 GHZ
      • Channels
      • Encryption
        • the process of scrambling data into an unreadable format which cannot be deciphered without the key
      • IP/MAC Adresses
        • IP adress
          • A unique number that is used to identify your computer while it is connected to the internet. since this number is assigned by software, if you leave the internet and re-join, you might have a different iP address
          • Needed for packets. Packet switching would not work without an IP address since the packets are sent towards the IP of the computer
        • MAC Addresses
          • its needed for the data link layer of the OSI model. They are used as a network address for most IEEEE 802 network technology
    • IP/MAC Adresses
      • IP adress
        • A unique number that is used to identify your computer while it is connected to the internet. since this number is assigned by software, if you leave the internet and re-join, you might have a different iP address
        • Needed for packets. Packet switching would not work without an IP address since the packets are sent towards the IP of the computer
      • MAC Addresses
        • its needed for the data link layer of the OSI model. They are used as a network address for most IEEEE 802 network technology
    • Layers
      • 1) The physical layer
        • Application layers
        • This layer conveys the bit stream across the network either electrically, mechanically or through radio waves. The physical layer covers a variety of devices and mediums, among them cabling, connectors, receivers, transceivers and repeaters
      • 2) The data link layer
        • Application layers
        • This layer sets up links across the physical network, putting packets into network frames. This layer has two sub-layers: the logical link control layer and the media access control layer (MAC). MAC layer types include Ethernet and 802.11 wireless specifications.
      • 3) The network layer
        • This layer handles addressing and routing the data -- sending it in the right direction to the right destination and receiving incoming transmissions at the packet level. IP is the network layer for the internet.
      • 4) The transport layer
        • Data transport layers
        • This layer manages packetization of data, then the delivery of the packets, including checking for errors in the data once it arrives. On the internet, TCP and UDP provide these services for most applications as well.
      • 5) The session layer
        • Data transport layers
        • This layer sets up, coordinates and terminates conversations. Its services include authentication and reconnection after an interruption. On the internet, Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) provide these services for most applications.
      • 6) The Presentation layer
        • This layer is usually part of an operating system (OS) and converts incoming and outgoing data from one presentation format to another -- for example, from clear text to encrypted text at one end and back to clear text at the other.
      • 7) The application layer

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