Protocol

Protocol

Set of rules for communication so that devices can communicate effectively and reliably
Developed in layers
TCP/IP
1. Transmission Control Protocol/Internet Protocol
2. Layers
  1. Application
    1. Where the network applications function (email, websites etc.)
    2. Email
      1. POP (Post Office Protocol)
        Sends the only copy of the email to your device
        Only downloads email onto a single computer
        Used for inbound emails
      2. IMAP (Internet Message Access Protocol)
        Sends a copy of the email to you
        Can be downloaded onto multiple computers
        Used for inbound emails
      3. SMTP (Simple Mail Transfer Protocol)
        Used for outbound emails
        Goes from Client to Mail Server to Internet
        Uses domain names
      4. FTP (File Transfer Protocol)
        Handles Uploads and downloads
        Usually sends unviewable content
        Can be replaced with HTTP
      5. HTTP (HyperText Transfer Protocol)
        Links websites using Hypertext Links
        Is used to access websites on a webpage
        Can be HTTPS for more secure connections
  2. Transport
    1. A connection is set up between 2 hosts, the rules are agreed (Packet size etc)
    2. TCP (Transmission Control Protocol)
      1. This splits or assembles the packeted data
      2. Acknowledges that the data is sent, this is a form of error checking
  3. Network
    1. Packets are addressed/put into packets
    2. Finds the route between nodes to sent the data
    3. IP (Internet Protocol)
      1. Addresses the source of the data/the destination of the data
      2. Once the data is sent, the IP addresses are removed from the packets
  4. Link
    1. This is the hardware layer
      1. Hubs/Switches/Device Drivers
    2. Ethernet
      1. A family of protocols
      2. Segment, Format, Send
      3. Packets are formed at the link layer
      4. An ethernet cable links hardware devices
    3. WiFi
      1. A family of protocols
      2. Made up of radio waves which pass through the air
      3. The data is encrypted using WPA (WiFi Protected Access)
      4. Split up into channels with a designated frequency
      5. However different channels can also clash
      6. Advantages
        A remote connection so is easy to use
        Cheap and easy setup
        Easily Expandable
      7. Disadvantages
        Interference can occur between channels
        Often it can be slower
        It has a limited range
        Can be unreliable
        Vulnerable to hacking

Next up

Description

Resource summary

Similar

	Created by Ben Botting almost 6 years ago