Which protocol is used for remote logins via terminal or command line interface (CLI)?

Which protocol is used for remote logins via terminal or command line interface (CLI)?

• A. SMTP
• B. TFTP
• C. Telnet
• D. HTTP

Answer: (C)

Telnet is the protocol specifically designed for remote logins through terminal or command-line interfaces (CLI). It allows users to connect to a remote server or device and interact with it as if they were physically present at its console. Telnet operates primarily over TCP and establishes a two-way communication channel, enabling commands to be sent and responses to be received in real-time. The choice of Telnet is distinct because it provides a simple and widely supported method for accessing devices and servers remotely. However, it is worth noting that Telnet transmits data, including login credentials, in plain text, which can make it vulnerable to eavesdropping. In contrast, SMTP (Simple Mail Transfer Protocol) is used for sending emails, TFTP (Trivial File Transfer Protocol) focuses on transferring files, and HTTP (Hypertext Transfer Protocol) is utilized for transferring web pages. None of these protocols are designed for direct command-line interaction or terminal access like Telnet, making it the correct answer for this question.

Telnet is the protocol specifically designed for remote logins through terminal or command-line interfaces (CLI). It allows users to connect to a remote server or device and interact with it as if they were physically present at its console. Telnet operates primarily over TCP and establishes a two-way communication channel, enabling commands to be sent and responses to be received in real-time.

The choice of Telnet is distinct because it provides a simple and widely supported method for accessing devices and servers remotely. However, it is worth noting that Telnet transmits data, including login credentials, in plain text, which can make it vulnerable to eavesdropping.

In contrast, SMTP (Simple Mail Transfer Protocol) is used for sending emails, TFTP (Trivial File Transfer Protocol) focuses on transferring files, and HTTP (Hypertext Transfer Protocol) is utilized for transferring web pages. None of these protocols are designed for direct command-line interaction or terminal access like Telnet, making it the correct answer for this question.