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1.3.3 - Networks (LAN vs WAN (LAN (small geographical area, can…

- - - - physical adress
      - unique
      - static
  - - - terminater
      - if backbone breaks it all breaks
      - cheaper
    - - uses a swtich and lots of wires
      - expsenisieve
      - simple and common
    - - sends all data in one direction
      - if one breaks it all breaks
- - - - inputted by manifaqcturers
      - hexi decimol
      - three octets
- - - - TCP- transmission control protocol - used to ensure error free transmission and package switching
      - IP -internet protical - used to transfer packets across the internet
      - FTP - file transfer protocol, to upload and download files across the internet
      - HTTP: hypertext transfer protocol- used by web servers and browsers to transfer web pages
      - SMTP- simple mail transfer protocol - used to transfer email
- - - - collects and delivers data
    - - looks after conversation between data sent and data needed by application, encryption/decrption
    - - starting and ending sessions
      - simplex half duplex or full duuplex
    - - keeping track of segments, checking successful transmission and packetisation
    - - transmission of actual data packets
      - routing
    - - MAC addressing
      - access error checking and correction
    - - network devices and transmission media
  - - - FTP
        
        file transther protical
      - HTTP
    - - TCP
      - keeping track of segments, checking successful transmission and packetisation
    - - uses IP
      - same as OSI
    - - actula data link
  - - - ip addresses 128 bit identifyers
      - eight octects
      - static or dynamic
        
        dynamic are more useful as they can be realsed
        
        sub net addressing is used
  - - - application
        
        coolectung data
        
        user interface
        
        vlidation
      - network
        
        layout
        
        tranmisson
        
        toplogy
        
        route
      - physical
        
        transmission mediuum
        
        link
- - - - header-source address, destination address, sequence number, protocol
      - payload-data
      - trailer- checksum, end of packet marker