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Which protocol is used for secure remote login to network devices?
- Telnet
- FTP
- SSH
- HTTP
Answer: SSH
SSH (Secure Shell) provides encrypted remote login and command execution over insecure networks. Replaces insecure Telnet which transmits data in plaintext. SSH uses public-key cryptography for authentication and supports port forwarding, file transfer (SFTP), and tunneling. Default port: 22.