OSI model

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  • OSI model
    • Physical player
      • Describes physical properties of the network eg. cables, voltages and frequencies, bit encoding, and transfer rates
    • Data Link Layer
      • Decides what order data is sent and received and finds the physical device on the network
    • Network Layer
      • Transmits and routes data packets through the shortest path possible towards the network of their destination (Shortest period of time is taken not shortest distance
    • Transport Layer
      • Guaranties that data is delivered from one end to the other, it also handles error checking and correct transmission of sent/received data
    • Session Layer
      • Controls the communication that happens between devices that are connected to each other, it starts, manages, and terminates connection sessions eg. login rights, permissions, access rights
    • Presentation Layer
      • This layer converts data between formats required for applications and transmissions over network, also it encrypts,  compresses and translates when necessary
    • Application Layer
      • Is made of network aware applications and is the layer that users interact with eg. emails, web browsers, and network drives
    • Mnemonics
      • It assists the memory

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