Telnet is an insecure protocol because it transmits data, including credentials, in plaintext without encryption. Secure Shell (SSH) is recommended instead of Telnet for remote server management because SSH encrypts the connection to prevent eavesdropping and man-in-the-middle attacks.
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Why is Telnet considered insecure for remote server management?
What is Secure Shell (SSH), and how does it improve security?
What are man-in-the-middle attacks, and how does SSH prevent them?