5. How can one verify the authenticity of the remote host's public key to avoid being spoofed
4. Public-key cryptography is a cornerstone of SSH's security model. Can you explain how it works
3. OpenSSH is a popular implementation for Unix systems, but it only supports SSH protocol version 2
2. Describe concept of tunneling in context of SSH,its advantages,particularly for X Widow system
1. Explain the key security features of SSH that make it the de facto standard
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