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networks (network protocol (TCP/IP (when receiving data the protocol is,…

- - - - dividing packets
      - adding numbers to each packet so they can be assembled
      - add correction codes
- - - - circuit switching allows to phones or computers to send messages to each other by establishing a psychical connection and having the data all sent in one go
    - - every network would have to be capable of the maxim bandwidth
      - difficult to scale up
      - extremely inefficient because once a line is being used no one else can use that line even if not data is being transmitted
  - - - instead of the data being sent all at once it is separated into packets
        
        each packet is given a number to id what number they should be arranged in
        
        each packet travel in different direction taking the shortest route possible
        
        once all packets arrive a message is sent back to the original computer if a packet is missing or corrupt a message will be sent asking for that packet to be sent again
      - packet info
        
        each packet has a header which contains 3 key parts
        
        a return address
        
        a destination address
        
        a sequence number so that the packet can be rearranged in the correct order
    - - robust if a router goes down there are other ways for the the packet to reach its destination
      - more efficient then circuit switching
      - unlike in circuit switching where if the connection is lost the whole message is lost in packet switching only the packet which haven't arrived are resent
      - each packet carries its own correction codes
    - - because each packet travels along random paths it might not all arrive at the same time
      - each packet arrives in a random order so they have to be reassembled