For years, the default answer to remote access was a VPN. The VPN still has a place, but for many small businesses it is no longer the best first choice. A traditional VPN connects a user to a network. Zero Trust Network Access (ZTNA) does something more precise: it connects an authorized user to a specific application or resource, and nothing else.

A Network Is Not a Front Door

That difference matters more than it sounds. When an employee, contractor, or vendor needs only the file server, the accounting app, or a single admin console, they should not automatically receive a route to everything else inside the business. ZTNA applies the core zero trust principle of never trust, always verify by checking identity, role, device posture, and location against policy before every connection. Unless a user is explicitly authorized to reach a system, that system stays invisible to them.

What ZTNA Fixes About Legacy VPN Thinking

Legacy VPN thinking extends the corporate network out to every remote user. ZTNA inverts that model with narrow, policy-based connections to individual resources. The security payoff is concrete: a smaller attack surface, far less room for lateral movement if an account or device is compromised, and remote access that is easier to reason about and manage. Most cloud-delivered ZTNA platforms also use outbound-only connectors from your private environment to the provider’s cloud, meaning no inbound firewall ports exposed to the internet at all.

Where SASE Fits In

You will hear ZTNA mentioned alongside SASE (pronounced “sassy”): Secure Access Service Edge. SASE is the broader architecture: it combines networking and cloud-delivered security services such as ZTNA, secure web gateway, CASB, firewall-as-a-service, and SD-WAN. Put simply, ZTNA is one important part of SASE. A small business can start with ZTNA to replace or reduce VPN use, then grow into a fuller SASE approach as needs expand.

Choosing a Platform

For larger or more complex environments, Zscaler Private Access and the broader Zscaler Zero Trust Exchange are robust, mature, feature-rich options that deserve serious consideration. For smaller or lower-budget deployments, several vendors offer compelling paths into ZTNA:

• Cloudflare One (Cloudflare Zero Trust): a strong fit if you want cloud-brokered private app access, DNS filtering, web security, and broader SASE features in one platform.
• Tailscale: especially attractive for small technical teams that want simple, secure user-to-resource connectivity built on WireGuard, with identity and granular access policies.
• Microsoft Entra Private Access: worth evaluating if you already run Microsoft Entra ID, Conditional Access, and Microsoft 365, because it brings private application access into the identity ecosystem you already manage.

Start Small, Then Expand

The best ZTNA project starts with one resource, not a platform migration. Pick a sensitive internal system, define who truly needs it, require MFA, and pilot with a small user group. Then expand resource by resource. For a small business, the goal is not to buy the biggest security platform on day one. The goal is to stop treating the whole network as the front door.

Thinking about modernizing your VPN? Di1 designs Zero Trust and ZTNA rollouts sized for your business. Book a consultation.