Which of the following is rarely used today, due to security concerns.Group of answer choicesTelnetSFTPTCPTLS

1. Break Down the Problem

We need to evaluate the security of various protocols listed in the options: Telnet, SFTP, TCP, and TLS, to identify which one is rarely used today due to security concerns.

2. Relevant Concepts

• Telnet: A protocol used for text-based communication over a network, which transmits data, including passwords, in plain text, making it vulnerable to interception.
• SFTP (SSH File Transfer Protocol): A secure version of FTP that uses SSH to encrypt the connection, providing secure file transfer.
• TCP (Transmission Control Protocol): A fundamental protocol for transmitting data over networks but does not provide encryption or security features itself.
• TLS (Transport Layer Security): A cryptographic protocol designed to provide secure communication over a computer network, widely used and considered secure.

3. Analysis and Detail

• Telnet is the primary concern here because it does not encrypt data, making it susceptible to eavesdropping. Due to these vulnerabilities, it is largely considered outdated and insecure.
• SFTP is commonly used for secure file transfers and is not plagued by security concerns.
• TCP is a necessary transport layer protocol but lacks built-in security features, although it operates in conjunction with TLS for secure connections.
• TLS is trusted and essential for secure communications and is widely accepted.

4. Verify and Summarize

Based on the security evaluations, it’s clear that Telnet is the protocol that is rarely used today due to its significant security concerns compared to the other protocols listed.

Final Answer

Telnet is rarely used today due to security concerns.