For IT leaders
VPN is still a default building block for hybrid cloud, partner connectivity, and remote access; a team that cannot debug it owns its outages.
Why IT teams care
Where this shows up at the team level
- Hybrid-cloud, branch-to-headquarters, and partner integrations all rely on site-to-site VPN.
- Remote-access VPN remains a primary path for vendors, contractors, and emergency access even alongside zero-trust tools.
- VPN failures often correlate with tunnel timeouts, NAT changes, or certificate rotations that need clear ownership.
In production
Where teams encounter it
- Site-to-site IPsec VPNs between offices and to AWS / Azure / Google Cloud
- Remote-access SSL or IKEv2 VPNs for employees and contractors
- Branch SD-WAN devices terminating VPN overlays
How it works
How VPN actually works
- 01VPN endpoints negotiate keys (commonly via IKE) and then encrypt and encapsulate IP traffic in IPsec or SSL/TLS for transport across the untrusted network.
- 02Site-to-site VPNs connect two networks transparently to users; remote-access VPNs connect a single device into a network.
- 03Modern designs combine VPN with identity, posture, and zero-trust policy so access does not depend on tunnel-only trust.
- 04Performance and reliability depend on encryption choices, MTU/MSS settings, and the underlying internet path.
In practice
Common team use cases
- Connecting branch offices to headquarters or to cloud landing zones
- Giving remote employees and vendors secure access to internal apps
- Extending on-prem networks into cloud VPCs without dedicated circuits
Build the capability
Related CBT Nuggets training
Each link routes to a hub that goes deeper than this definition.
Related concepts