ZTNA (Zero Trust Network Access) is an approach to remote and internal access in which a user or device is not automatically trusted just because it connected to the corporate network. Every request to an application is verified individually: who is requesting access, from which device, to which resource, in what context, and under which policy.
The core idea of ZTNA is to replace the "connect to the network and see everything" model with "get access only to a specific application, and only if policy conditions are met." This reduces the attack surface and helps limit an attacker's lateral movement inside the infrastructure.
How ZTNA works
ZTNA is built around verifying identity, device posture, and access policy. The user authenticates, the system evaluates context, and access is granted only to the permitted application or service — the resource doesn't necessarily become visible on the broader network.
A typical cycle looks like this:
- User verification. Account, role, group, and authentication factor are taken into account.
- Device verification. Managed status, policy compliance, up-to-date protection, and other signals may be considered.
- Context evaluation. Connection source, risk level, time, application type, and resource sensitivity all matter.
- Minimal access grant. The user gets access not to the whole network, but to a specific application.
- Continuous reassessment. Access can be re-evaluated if context changes.
How ZTNA differs from VPN
VPN typically creates a secure tunnel into the corporate network. Once connected, a user often ends up inside the network perimeter and can potentially see more resources than needed for the task at hand.
ZTNA works differently: access is granted at the application and policy level, not at the level of network presence. This matters especially for hybrid work, contractors, cloud applications, and scenarios where the internal network can't be treated as trusted by default.
VPN remains a useful tool for a number of tasks, but ZTNA is a better fit where granular access, context-aware control, and reduced network exposure are needed.
What problems ZTNA solves
ZTNA isn't used only for remote employees. The main scenarios are:
- Remote access to corporate applications without exposing a broad network surface.
- Contractor and partner access limited to the systems they need, for a limited time.
- Access segmentation between user groups, applications, and environments.
- Protecting hybrid infrastructure, where some services run in a data center and others in the cloud.
- Reducing the risk of lateral movement if an account or device is compromised.
How to choose a ZTNA solution
When choosing ZTNA, look beyond tunneling to policy manageability. Practical criteria:
- integration with your corporate IAM/IdP and multi-factor authentication;
- the ability to define policies at the application, role, and context level;
- support for the application types and network protocols you need;
- transparency of access logs and security events;
- ease of onboarding for users, contractors, and administrators;
- compatibility with your current network and cloud architecture.
For companies operating in Russia, it's also worth checking the solution's fit with internal requirements, regulatory rules, and your existing security stack.
Common implementation mistakes
A frequent mistake is trying to replace VPN with ZTNA as a single technical switch-over. In practice, you first need to understand which applications and roles exist, who accesses what, and which policies are actually needed.
A second mistake is carrying over the old network access model without rethinking permissions. If a user used to see a broad network segment, ZTNA shouldn't simply reproduce that same behavior in a new interface. The real value appears once access becomes minimally necessary.
Hands-on practice at BI.ZONE Cybersecurity Labs
ZTNA is best learned through practical scenarios: configuring policies, testing access, reviewing events, and troubleshooting failures. The BI.ZONE ZTNA course lets you explore the approach on isolated lab environments and connect Zero Trust theory to real-world operation. Product capabilities are described on the BI.ZONE ZTNA page.