protocols

• Network protocol


  A set of rules governing the communication between devices on a network
• Protocols


  • TCP/IP
  • HTTP
  • HTTPS
  • FTP
  • POP
  • IMAP
  • SMTP
• TCP/IP


  Transmission Control Protocol / Internet Protocol
• TCP/IP


  • Provides an error free transmission between two routers (TCP)
  • Routing of packets on a wide area network (IP)
• HTTP


  A client-server method of requesting and delivering HTML files
• HTTPS


  Encryption and authentication for client-server data
• FTP


  Sending files between computers. Used for uploading web pages and associated files to a web server for hosting
• POP


  Used by email clients to retrieve email from a mail server
• IMAP


  Used by email clients to retrieve email from a mail server, and to manage remote mail boxes. Better than POP
• SMTP


  Sends mail to a mail server
• TCP/IP 5-layer protocol stack model

  • Physical layer
  • Data link layer
  • Network layer
  • Transport layer
  • Application layer

  
• TCP/IP packet


  • Source address
  • Destination address
  • Order number of the packet
  • Other tracking information
  • The data itself
  • Error control bits

  
• TCP/IP is a packet switching protocol for sending and receiving data between devices on a network. It is used for World Wide Web data transfers

  
• TCP/IP actually has a set of small protocols in layers which build together for network communication
• There are 5 layers in the TCP/IP model BECAUSE each layer can be replaced, improved SEPARATELY to the other layers