PPE computer science revision

PPE computer science revision

1. network protocols

   • mac addresses
     • every device needs a unique identifier so it can be found on a network.
     • mac addresses are assigned to all network- enabled devices by the manufacture
   • protocols cover how communication between two devices should start and end , how the data should be organised, and what the devices should do if data goes missing
   • a protocol is a set of rules for how devices communicate and how data is transmitted across a network
   • ip addresses
     • Ip addresses are used when sending data between TCP/IP networks over the internet

2. the internet

   • the cloud
     • cons of the cloud
       • subscription fees for using cloud storage and software may be expensive
       • a con is that it needs connection to the internet to access the files
       • it all depends on the host for security and backups
     • pros of the cloud
       • easy to increase how much storage is available
       • no need to buy expensive hardware to store the data
       • users can access files from any connected devices