2.7 - Protocols

The General Reference
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 Protocols are rules that a network system follows. There are many different types of protocol:

  • TCP: Organises data so that a transmission between the server and the client can be secure
    • Data can be retransmitted if it gets lost
    • Difficult so set up and manage
  • IP: Allows computers to communicate with websites and tells the website who's connecting
    • Gives additional security to the network
    • IP addresses are easily tracked
  • UDP: Establishes connections to the internet
    • Smaller packet size means faster processing
    • If error is detected, the packet is dropped
  • FTP: Transfers files between systems
    • Fast file transfer
    • Usernames, passwords and files are sent in plain text
  • HTTP: Transfers information between the client and the web server
    • Very flexible and can handle extensions and plugins
    • No encryption so data can be altered
  • SNMP: Network protocol that allows devices to communicate with other devices
    • Open protocol so is not property of a single company
    • Can't receive a large amount of data so isn't scalable
  • ICMP: Network protocol that allows devices to communicate with other devices and sends errors
    • Generates error messages so can be easily diagnosed
    • Vulnerable to PING flood
  • POP: Retrieves email from a remote server
    • Mail is downloaded so can be viewed when offline
    • Mail cannot be accessed from another device
  • IMAP: Retrieves email and stores them on a server
    • Can be accessed from another mail client
    • Can be complex to maintain

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