The classic enterprise VPN model is simple: connect, authenticate once, and you're treated as if you're plugged into the office network. That model made sense when "remote" meant a handful of traveling employees. It makes a lot less sense now that remote and hybrid work are the default, because a VPN that grants broad network access after a single login is also a single point of failure — steal one set of credentials, and an attacker inherits whatever that VPN connection was trusted to reach.
That gap is exactly why enterprise remote-access security has been shifting toward Zero Trust Network Access (ZTNA), and why a lot of "VPN" products sold today are really hybrids of the two models.
What a Traditional VPN Actually Does
A remote-access VPN encrypts traffic between a device and the corporate network and, in most implementations, places that device on the internal network as if it were physically there. Encryption in transit is genuinely valuable — it stops attackers on public Wi-Fi from intercepting traffic. The weakness is what happens after the tunnel is established: many VPN setups grant fairly broad network access by default, which means a compromised laptop or a phished credential can move much further than it should.
Where ZTNA Changes the Model
Zero Trust Network Access flips the assumption. Instead of granting network-level access after one login, ZTNA grants access to individual applications, one at a time, and re-verifies identity and device posture continuously rather than once at connection time. A user only ever sees the specific app they're authorized for — not the whole network behind it. That containment is the real security upgrade: if a device is compromised, the blast radius is one application instead of the entire internal network.
What device posture checks actually look for
- Whether the device has current OS and security patches installed
- Whether disk encryption and endpoint protection are active
- Whether the connection is coming from an expected location or an anomalous one
The Bottom Line
A VPN alone was never really designed for a workforce that's remote by default — it was designed to extend an office network to a small number of traveling users. ZTNA closes the gap that model leaves open: broad access granted on trust instead of access verified continuously and scoped narrowly. For distributed teams in 2026, that shift isn't optional so much as it's already underway.