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Learning objective

Standard application layer protocols: Be familiar with the following protocols: • FTP (File Transfer Protocol) • HTTP (Hypertext Transfer Protocol) • HTTPS (Hypertext Transfer Protocol Secure) • POP3 (Post Office Protocol (v3)) • SMTP (Simple Mail Transfer Protocol) • SSH (Secure Shell). Be familiar with FTP client software and an FTP server, with regard to transferring files using anonymous and non-anonymous access. Be familiar with how SSH is used for remote management. Know how an SSH client is used to make a TCP connection to a remote port for the purpose of sending commands to this port using application level protocols such as GET for HTTP, SMTP commands for sending email and POP3 for retrieving email. Be familiar with using SSH to log in securely to a remote computer and execute commands. Explain the role of an email server in retrieving and sending email. Explain the role of a web server in serving up web pages in text form. Understand the role of a web browser in retrieving web pages and web page resources and rendering these accordingly.

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Topic

The Transmission Control Protocol/Internet Protocol (TCP/IP)

Subtopic

Standard application layer protocols

Aqa A Level Computer ScienceFundamentals of communication and networking

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Quick explanation

Standard application layer protocols: Be familiar with the following protocols: • FTP (File Transfer Protocol) • HTTP (Hypertext Transfer Protocol) • HTTPS (Hypertext Transfer Protocol Secure) • POP3 (Post Office Protocol (v3)) • SMTP (Simple Mail Transfer Protocol) • SSH (Secure Shell). Be familiar with FTP client software and an FTP server, with regard to transferring files using anonymous and non-anonymous access. Be familiar with how SSH is used for remote management. Know how an SSH client is used to make a TCP connection to a remote port for the purpose of sending commands to this port using application level protocols such as GET for HTTP, SMTP commands for sending email and POP3 for retrieving email. Be familiar with using SSH to log in securely to a remote computer and execute commands. Explain the role of an email server in retrieving and sending email. Explain the role of a web server in serving up web pages in text form. Understand the role of a web browser in retrieving web pages and web page resources and rendering these accordingly

  • This point belongs to The Transmission Control Protocol/Internet Protocol (TCP/IP), especially Standard application layer protocols.
  • You need to be able to standard application layer protocols: Be familiar with the following protocols: • FTP (File Transfer Protocol) • HTTP (Hypertext Transfer Protocol) • HTTPS (Hypertext Transfer Protocol Secure) • POP3 (Post Office Protocol (v3)) • SMTP (Simple Mail Transfer Protocol) • SSH (Secure Shell). Be familiar with FTP client software and an FTP server, with regard to transferring files using anonymous and non-anonymous access. Be familiar with how SSH is used for remote management. Know how an SSH client is used to make a TCP connection to a remote port for the purpose of sending commands to this port using application level protocols such as GET for HTTP, SMTP commands for sending email and POP3 for retrieving email. Be familiar with using SSH to log in securely to a remote computer and execute commands. Explain the role of an email server in retrieving and sending email. Explain the role of a web server in serving up web pages in text form. Understand the role of a web browser in retrieving web pages and web page resources and rendering these accordingly.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Why it matters

This objective helps connect Standard application layer protocols to exam-style questions, flashcards, and revision notes for The Transmission Control Protocol/Internet Protocol (TCP/IP).

Quick student answer

Which protocol is primarily associated with transferring files between an FTP client and an FTP server?

Direct answer

FTP

Key terms

  • Application layer protocol: A protocol used by applications to communicate over a network, such as FTP, HTTP, HTTPS, POP3, SMTP or SSH.
  • Remote management: Using SSH to log in securely to a remote computer and execute commands, or to connect to a remote port and send commands.

Common trap

Confusing SMTP and POP3: SMTP is used for sending email, whereas POP3 is used for retrieving email.

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