VPN and ZTNA solve a similar problem: giving users access to corporate resources outside the office. But they do it differently. VPN connects a user to the network, while ZTNA grants access to a specific application based on policy and context.
So the question isn't which one is always better, but which access model fits a particular infrastructure and risk level.
How VPN Works
VPN creates a secure tunnel between the user's device and the corporate network. After connecting, the user ends up inside the network perimeter and can reach resources available from that segment.
VPN's advantages are clear: the technology is familiar, well-supported, and suitable for many administrative tasks. Its drawbacks are just as well known: broad network visibility, difficulty implementing granular policies, and dependence on the quality of internal network segmentation.
How ZTNA Works
ZTNA is built on the principle of trusting no one by default. Users don't get access to the entire network. They get access only to the application they need, and only if their role, device, and context match the policy.
This changes the security model: compromising an account or device shouldn't automatically open a path to a wide range of internal resources.
Key Differences
- Access target. VPN grants access to a network or segment; ZTNA grants access to an application or service.
- Trust model. VPN often assumes trust once connected; ZTNA verifies every access request against policy.
- Segmentation. With VPN, much depends on the network architecture; with ZTNA, segmentation is closer to applications and roles.
- Contractors. With VPN, it's easy to grant a contractor more access than needed; with ZTNA, it's easier to limit access to a specific task.
- Auditing. ZTNA typically makes it easier to link an access event to a user, an application, and a policy.
When VPN Still Makes Sense
VPN isn't disappearing overnight. It can still make sense for infrastructure administration, legacy systems, temporary scenarios, and environments with mature network segmentation already in place. If access is needed to a wide range of internal services and the risks are controlled by other layers, VPN can remain a workable option.
When to Consider ZTNA
ZTNA is especially useful if:
- you have many remote employees and contractors;
- you have hybrid infrastructure and cloud applications;
- you need to restrict access based on roles and context;
- the internal network can't be considered trusted;
- reducing the risk of lateral movement after a compromise matters.
How to Migrate Without a Hard Cutover
A practical approach is not to switch off VPN right away, but to select the first applications for ZTNA. Teams usually pick resources with clearly defined user groups and a high risk of excessive access. Then they define roles, policies, and logging, and gradually expand coverage from there.
This makes the migration manageable: VPN stays in place for legacy tasks, while new and critical scenarios move to the Zero Trust model.
Where to Practice This Approach
The difference between VPN and ZTNA is clearest in practice: in policies, logs, and access denials. In the BI.ZONE ZTNA course, you can work through secure access scenarios on lab environments and learn how to design policies without excessive network privileges.