> Per-app access, verified on every request

What Is ZTNA (Zero-Trust Network Access)?

Zero-Trust Network Access (ZTNA) is a security model that grants access to specific applications — not the whole network — only after verifying the user's identity and the device's security posture on each request. Unlike a VPN, which trusts any connected device with broad network access, ZTNA enforces least privilege and assumes no implicit trust.

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By Roman Heiman, CEO & Founder of RHC Solutions — 30+ years in IT and cyber security.

In short: ZTNA brokers a secure, identity-aware connection between a user and an individual application, re-checking identity, device health, and policy for every session. Because access is scoped to one app at a time and continuously verified, a compromised account or device cannot move laterally across the network the way it can once a traditional VPN tunnel is open.

ZTNA vs VPN: the core difference

Dimension	Traditional VPN	ZTNA
Trust model	Trusts the device once connected	Verifies identity + device on every request
Access scope	Broad network access	One application at a time (least privilege)
Lateral movement	Possible after a single foothold	Contained — no network-level access
Device posture	Rarely checked continuously	Checked on every session
Best for	Legacy site-to-site, small teams	Distributed teams, contractors, SaaS + private apps

How ZTNA works

A ZTNA broker — often delivered as part of a SASE platform — sits between users and applications. When a user requests an app, the broker authenticates them through your identity provider (Microsoft Entra ID or Okta), checks the device posture (managed, patched, compliant), evaluates policy, and only then establishes an encrypted, application-scoped connection. The app itself stays hidden from the public internet; nothing is exposed at the network edge.

When to choose ZTNA

ZTNA is the right move when remote and hybrid work, third-party contractors, or a mix of SaaS and private apps have outgrown a flat VPN — especially where regulated data or ransomware containment demand least-privilege access. It's a foundational component of a broader Zero-Trust architecture spanning identity, devices, network, applications, and data.

> FAQ

Frequently asked questions

Is ZTNA the same as a VPN?

No. A VPN grants broad network access once a device connects; ZTNA grants access to one application at a time, re-verifying identity and device posture on each request. ZTNA contains the lateral movement that a VPN cannot.

Is ZTNA the same as Zero-Trust?

ZTNA is the network-access component of Zero-Trust. A full Zero-Trust architecture (per NIST SP 800-207) also covers identity, device, application, and data controls. ZTNA enforces the "verify per request" principle for network access specifically.

Does ZTNA replace our VPN?

Often, yes — for user-to-application access. Many organizations phase ZTNA in for the riskiest access first (contractors, admin apps) and retire VPN as coverage grows. Site-to-site connectivity may still use other methods.

What do we need to deploy ZTNA?

An identity provider (Entra ID or Okta), device-posture signals (EDR/MDM such as Intune), and a ZTNA/SASE broker. RHC designs the policy model and rolls it out application by application.

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Ready to move beyond VPN?

We design and deploy ZTNA as part of a phased Zero-Trust rollout — starting with your highest-risk access.

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