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Computer Science - Coggle Diagram

- - - - busy networks, high rate of collisions, packets have to be resent
      - quiet network, little traffic, few collisions
    - - fibre optic higher than ethernet cable
  - - - 12HEX digits grouped in pairs
      - each one completely unique - they never change, a devices MAC address will stay the same no matter the network
      - Media Access Control
    - - uniquely identifies computers within a network
      - Internet Protocol
        
        IPv4
        
        4 blocks of denary numbers, over 4billion address, running out of addresses
        
        IPv6
        
        new format, devices have both, have 8 blocks of 4HEX digits, very alot alot very of addresses
      - They change - you may have one address while connected to one network, this address will change when you connect to a different network
- - - - Stores all running programs, quick to access from the CPU, volatile
    - - Read only, non-volatile, cannot be changed, start up instructions
    - - created in secondary storage devices when RAM is full
  - - - DVD
      - Blu-ray
      - CD
      - Advantages
        
        Cost
        
        Portable
      - Disadvantages
        
        easily damaged
    - - HDD
      - Advantages
        
        Cost
      - Disadvantages
        
        Slow
    - - SSD
      - Memory sticks
      - Advantages
        
        Speed
        
        Robust reliable
        
        Portable
      - Disadvantages
        
        Cost for capacity
  - - - 8 bits per character, maximum 256 characters
    - - more possible combinations, allows for emojis, other languages
  - - - how many measurements of the sounds amplitude are taken each second - hertz
    - - number of avalible bits to store each sample e.g. 16-bit
      - higher the depth, higher the quality
  - - - removes some information: reduce colour depth, reduce bit depth, reduce resolution
      - not good if 100% accuracy required - documents
      - irreversible
    - - compression without losing any information
      - reversable
      - files often left larger than with lossy as no data is lost
      - works if 100% accuracy is required
      - e.g. - 'aaaaaaaaaaaaaa' compressed to 'a14'