Network Protocols

Network Protocols

1. Email

   • Post Office Protocol(POP)
     • RECEIVE emails
     • STORED on SINGLE device (can access OFFLINE)
   • Internet Message Access Protocol (IMAP)
     • RECEIVE emails
     • ACCESSED from MULTIPLE devices (need internet connection)
   • Simple Mail Transfer Protocol (SMTP)
     • SEND emails

2. Internet

   • Hyper-Text Transfer Protocol (HTTP)
     • REQUESTING and DELIVERING HTML files
       • Hyper-Text Transfer Protocol Secure (HTTPS)
         • ENCRYPTED connection
   • File Transfer Protocol (FTP)
     • SEND files from one NODE to ANOTHER
   • Transmission Control Protocol/ Internet Protocol (TCP/IP)
     • COMMUNICATION process (Layers)
       • 1. Application, 2. Transport, 3. Internet, 4. Network
         • ORDER: No.1-4 SEND. No.4-1 RECEIVE
         • 1. Where APPS are being USED (HTTP/S, FTP, SMTP. IMAP, POP, DNS)
         • 2. SETS UP COMMUNICATION & RULES between HOST (TCP)
         • 3. Puts DATA in PACKETS and gives ADDRESS (IP)
         • 4. Network Hardware SENDS data from SENDER to RECIPIENT (Hardware/Ethernet/WiFi)
     • HOW data is TRANSFERRED through a network
       • e.g. via Internet of VPN
   • HyperText Markup Language (HTML)
     • Writing WEB PAGES for DISPLAY

3. RULES that govern COMMUNICATION between NODES