protocols and layers

• What does the acronym DNS stand for?

  Domain Name System
• What is the primary function of DNS?

  Keeps track of IP addresses to domain names
• What does HTTP(S) stand for?

  Hypertext Transfer Protocol (Secure)
• What is the main use of HTTP(S)?

  Retrieving information from remote services
• What does FTP stand for?

  File Transfer Protocol
• What is the primary function of FTP?

  Transferring/sharing files across the internet
• What does SMTP stand for?

  Simple Mail Transfer Protocol
• What is the role of SMTP?

  Sending and delivering emails across the internet
• What does POP stand for?

  Post Office Protocol
• What is the function of POP?

  Retrieving emails from the email server
• What does IMAP stand for?

  Internet Message Access Protocol
• What is the primary function of IMAP?

  Retrieving emails while leaving them on the server
• What are the main application layer protocols and their functions?

  • DNS: Maps IP addresses to domain names
  • HTTP(S): Retrieves information from remote services
  • FTP: Transfers/shares files across the internet
  • SMTP: Sends and delivers emails
  • POP: Retrieves emails from the server
  • IMAP: Retrieves emails while keeping them on the server