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Network Protocols (POP, IMAP, SMTP (internet message access protocol…

- - - - it can only handle one mailbox
      - messages, once downloaded, are deleted from the server.
      - does not support complex searches of emails on the server
- - - - adds a sequence number to each packet
      - divides the message into smaller packets
      - adds error connection information so they can be fixed
    - - examines each packet for errors
      - fixes errors (if possible) or requests packets to be resent
      - uses sequence number to reassemble
  - - - adding the destination address to the packets
      - adding its own address to indicate where the packet comes from
    - - accepting data packets which have its address attached
      - ignores packets with other address' on