Which security goal does encryption mainly support in a Virtual Private Network (VPN)?

### Why this is right\nEncryption changes readable plaintext into ciphertext so an unauthorized observer cannot readily understand protected traffic. That directly supports confidentiality.\n\n### The concept\nConfidentiality is protection against unauthorized disclosure. Integrity concerns unauthorized changes, while availability concerns timely access to services. A VPN can support all three goals through different controls, but encryption itself does not keep a failed link running.\n\n### The other options\n- **Availability**: resilience and recovery help maintain access; encryption does not prevent outages.\n- **Route summarization**: this combines routes for more efficient routing and is unrelated to encryption.\n- **Address resolution**: this maps network addresses to local-link addresses, not a confidentiality mechanism.\n\n### Terms\n- **VPN**: Virtual Private Network, a protected tunnel across another network.\n\n### Remember\nEncryption primarily protects confidentiality, not availability.