Zero Trust Network Access Control ( NAC ) > ZT-NAC Product Overview

Product Overview

COSGrid ZT-NAC is an agent-based Zero Trust Network Access Control solution that enforces identity-driven and posture-aware access policies at the exact moment a device connects to the LAN.

Unlike traditional NAC solutions that rely on VLANs, switch reconfigurations, and infrastructure-heavy segmentation, ZT-NAC applies firewall-based, identity-first controls without requiring changes to switching architecture.

Core Principle:

  • Never trust a device simply because it is on the LAN.

  • Access is continuously verified based on identity, posture, and context.

ZT-NAC eliminates blind trust inside corporate networks and ensures continuous compliance validation for both on-premises and hybrid environments.

Key Functions and Benefits

1. Identity-First Access Enforcement

  • Grants access based on user identity, not just device IP/MAC.

  • Integrates with directory services (AD / IdP).

  • Supports role-based access control (RBAC).
    Benefit: Prevents unauthorized lateral movement within LAN.

2. Real-Time Device Posture Validation

  • Checks patch level

  • Antivirus status

  • Disk encryption

  • OS compliance

  • Security agent status
    Benefit: Only compliant devices are allowed network access.

3. VPN-Free Firewall-Based Architecture

  • No tunnels required

  • Uses native firewall rule enforcement

  • No VLAN reconfiguration needed
    Benefit: Faster deployment and simplified infrastructure.

4. Dynamic LAN Segmentation

  • Micro-segmentation based on identity and device posture

  • Context-based policy enforcement

  • Dynamic rule updates on login/logout
    Benefit: Reduces blast radius of breaches.

5. Continuous Monitoring & Audit Logging

  • Real-time device monitoring

  • Policy evaluation logs

  • Compliance reporting

  • SIEM integration
    Benefit: Enables regulatory compliance and forensic visibility.

Target Use Cases

ZT-NAC is designed for organizations that require:

  • Secure corporate LAN access

  • Hybrid work enforcement

  • BYOD and contractor onboarding

  • Branch office policy consistency

  • Compliance-driven industries (BFSI, Healthcare, Government)

  • Rogue device prevention