1. A network zone containing public-facing web servers and mail relay that accept internet connections but are restricted from accessing internal systems directly
2. A hardened host that is the sole authorized path for all administrative SSH and RDP sessions; enforces MFA and logs every command
3. A server with no real data or legitimate function that generates a high-confidence alert when any device connects to it — zero false positives by design
4. A Layer 3 encryption protocol that creates an encrypted tunnel between two network sites, protecting all traffic regardless of application-layer encryption