What Is Zero Trust Network Access (ZTNA)? Technology and Best Practices

Zero Trust Network Access (ZTNA) is a security framework that requires strict identity verification for every user and device attempting to access applications or resources, regardless of their location. Adopting a “never trust, always verify” approach, ZTNA provides segmented access to specific applications, minimizing vulnerabilities by hiding resources from public view and preventing lateral movement within the network. 

Unlike traditional VPNs that grant broad network access once a user is connected, ZTNA provides access only to specific applications and resources on a per-session basis after strict verification. This model is more resilient to evolving threats and is better suited for modern, distributed IT environments. 

Key principles:

• Verify explicitly: ZTNA requires continuous verification of users and devices, going beyond initial authentication to incorporate real-time contextual information like user identity, device posture, and location. 
• Least privilege access: Users are granted only the specific access necessary for their roles and tasks, rather than broad network access. 
• Assume breach: The model operates on the assumption that threats exist both inside and outside the network, leading to a focus on controlling access to individual applications and data. 

How ZTNA works:

• Identity & context-based policies: A trust broker verifies the identity and context (e.g., user behavior, device security) of a user or device against defined access policies. 
• Microsegmentation: Applications and resources are isolated into secure zones, creating a granular “perimeter” around each resource rather than a large network perimeter. 
• Secure, segmented connections: Only after successful verification is a secure, per-session connection made to the specific application(s) the user is authorized to access. 

How ZTNA Works 

ZTNA operates by establishing secure, encrypted connections between authenticated users and applications, rather than providing broad network access. It uses a broker or gateway to mediate access, verifying user identity, device health, and policy compliance before granting access to a particular resource. The user never directly connects to the network, reducing exposure and preventing lateral movement.

Identity & Context-Based Policies

Typically, a ZTNA deployment includes identity providers (IdPs) for authentication, posture assessment tools for evaluating device health, and policy engines that enforce access rules based on context. When a user requests access, the ZTNA solution checks their credentials, device posture, and contextual signals (e.g., location, time, risk score). If all checks pass, access is granted via a secure tunnel to the specific application.

Microsegmentation

Microsegmentation in ZTNA involves dividing the network into small, isolated zones where each application or service is protected by its own access policies. Rather than relying on a single perimeter, ZTNA enforces granular security controls at the application level. This means users and devices must be explicitly authorized to access each individual resource, even within the same environment. 

Secure, Segmented Connections

Applications are hidden from public exposure and cannot be discovered or scanned externally. This isolation limits attack surfaces and reduces the risk of exploitation. Since ZTNA connections are application-specific, unauthorized access to other services, even within the same network segment, is blocked by default. The system continuously monitors session activity to detect anomalies and enforce real-time policy adjustments.

Learn more in our detailed guide to zero trust architecture 

Benefits of ZTNA 

Zero Trust Network Access provides a modern, identity-centric approach to securing access in hybrid and remote environments. By enforcing verification at every step and isolating application access, ZTNA improves security posture, reduces complexity, and supports adaptive access control. The following are key benefits of implementing ZTNA:

• Reduced attack surface: Applications and services are hidden from public networks, minimizing exposure to scanning, probing, and exploitation. Only verified users and compliant devices can reach authorized resources.
• Improved access control: Access decisions are based on user identity, device posture, and context, ensuring that permissions are precise and dynamic rather than static and network-based.
• Prevention of lateral movement: Since ZTNA grants access to specific applications rather than full networks, attackers cannot move laterally across systems even if one account or device is compromised.
• Enhanced remote security: ZTNA provides consistent security for on-premises, remote, and cloud users without relying on VPNs, improving user experience while maintaining strict policy enforcement.
• Continuous verification: Unlike one-time authentication, ZTNA enforces ongoing validation of user and device trust throughout sessions, allowing immediate response to changes in risk or posture.
• Simplified network management: Centralized policy control reduces complexity associated with managing multiple firewalls or VPN configurations and enables faster adaptation to organizational changes.
• Support for cloud and hybrid environments: ZTNA integrates with identity providers and cloud platforms, allowing secure access to distributed applications across diverse infrastructures.
• Regulatory and compliance alignment: By providing detailed visibility, logging, and least-privilege enforcement, ZTNA helps organizations meet compliance requirements for data protection and access control.

Key Use Cases of ZTNA 

Secure Remote Workforces

ZTNA enables organizations to provide secure connectivity for remote workforces by enforcing identity, device posture, and context-aware access to business applications, regardless of user location. This approach prevents unauthorized access and restricts exposure if an endpoint is compromised. Secure tunnels are established only to the target applications, unlike VPNs that typically expose the entire network, reducing risks associated with remote work.

Remote workers benefit from simplified and consistent logins, strong authentication, and adaptive access controls, which improve productivity while maintaining security. ZTNA also enables auditing and monitoring of remote user activity, helping organizations detect abnormal behavior and respond quickly to potential threats, such as credential theft or unauthorized data sharing.

Third-Party Access Control

ZTNA simplifies and strengthens access management for third parties, including contractors, consultants, and partners, by ensuring they receive only the minimum required privileges to specific resources. Rather than granting broad network access through VPNs or direct connections, ZTNA solutions restrict these external users to approved apps and services, based on unique identities and security posture checks.

Granular access control minimizes risk from supply chain or vendor-related threats, which have become a significant attack vector. ZTNA also supports rapid onboarding and offboarding, automatically revoking access when a contractor’s engagement ends or if they fall out of compliance. 

IoT and OT Device Protection

ZTNA extends security to IoT (Internet of Things) and OT (Operational Technology) devices, which are frequently overlooked in traditional security models. By authenticating devices and limiting their network privileges, ZTNA prevents unauthorized access and restricts lateral movement from compromised sensors, controllers, or smart devices. 

Policy-driven segmentation keeps vulnerable or unmanaged IoT assets isolated from critical resources. Continuous posture assessment and anomaly detection can prevent IoT devices from becoming attack vectors or points of ingress for attackers. 

Cloud Application Security

ZTNA addresses security for cloud applications by controlling user access based on identity, posture, and context, progressively replacing legacy solutions that focused on network boundaries. Users gain access to authorized SaaS, PaaS, or IaaS resources via secure, brokered connections, while unauthorized users and devices are invisible and isolated. 

This model minimizes exposure to cloud-hosted threats and mitigates the risk of credential abuse. Organizations gain visibility into who is accessing cloud workloads, including data flow monitoring, threat analytics, and policy enforcement across multiple cloud environments. 

What’s the Difference Between VPN and ZTNA? 

While both Virtual Private Networks (VPNs) and Zero Trust Network Access (ZTNA) provide secure remote access, they differ fundamentally in architecture, trust model, and security posture. VPNs extend the corporate network to remote users, while ZTNA restricts access to applications based on verified identity and context.

1. Trust model
VPNs operate on an implicit trust model. Once connected, users often gain broad access to internal resources. ZTNA, in contrast, applies the principle of “never trust, always verify.” Every access request is independently authenticated and authorized, ensuring that even authenticated users can reach only approved applications.

2. Access scope
VPNs connect users to an entire network segment, exposing them to services and systems that may not be relevant to their roles. ZTNA provides application-level access, preventing lateral movement and reducing the blast radius of a compromised account or device.

3. Security and visibility
ZTNA continuously evaluates user identity, device posture, and behavioral signals to maintain trust throughout a session. VPNs typically authenticate only at login and do not reassess device health or user risk dynamically. This makes ZTNA more adaptive to changing threat conditions and user behavior.

4. Deployment and scalability
VPNs often rely on centralized gateways that can become bottlenecks as organizations scale or move to hybrid environments. ZTNA uses cloud-native or distributed architectures, integrating directly with identity providers and enabling secure access from any location without complex network routing.

5. User experience and management
ZTNA solutions simplify user experience by providing context-aware access without requiring manual VPN connections. Centralized policy management simplifies administration and improves compliance visibility, whereas VPNs demand more static configurations and ongoing maintenance.

Key Technologies Enabling ZTNA 

Identity and Access Management (IAM)

Identity and access management (IAM) is foundational for ZTNA, providing centralized authentication, authorization, and identity lifecycle services. IAM platforms manage user identities, enforce password policies, and enable integration with directory services. Effective IAM solutions support SSO (Single Sign-On) and federation, which are essential for controlling access across multiple internal and SaaS resources without compromising user experience or security.

IAM also supports granular access policies, auditing, and logging, giving organizations visibility into who is accessing systems and what actions they are performing. By tying access decisions to individual identities instead of static network parameters, IAM enables context-aware and role-based access controls that underpin zero trust principles. 

Multi-Factor Authentication (MFA)

Multi-factor authentication (MFA) strengthens ZTNA implementations by requiring users to provide two or more verification factors, such as passwords, biometrics, or tokens, before gaining access to protected resources. This additional layer of authentication mitigates risks associated with lost or stolen credentials and significantly reduces susceptibility to phishing, credential stuffing, and social engineering attacks.

MFA is now a core requirement for zero trust models in most organizations. ZTNA solutions integrate MFA as a triggering condition for sensitive access, high-risk transactions, or anomalous behavior detection. Conditional access policies can force step-up authentication based on the user’s location, device health, or behavior patterns. 

Endpoint Security

Endpoint security in ZTNA ensures that devices accessing corporate resources meet security standards before granting connectivity. This may involve real-time posture checks for antivirus protection, OS version compliance, device encryption status, and the presence of necessary security controls. 

Posture assessments can block or restrict access from devices that are outdated, compromised, or otherwise non-compliant, thus reducing potential entry points for attackers. Continuous monitoring of endpoints helps detect compromised devices or suspicious behavior during active sessions. 

Cloud Access Security Broker (CASB)

A cloud access security broker (CASB) sits between users and cloud service providers to enforce security policies when accessing SaaS applications or corporate data in the cloud. CASBs provide visibility into cloud usage, identify risky shadow IT behavior, enforce data protection policies, and ensure compliance with regulatory frameworks. 

CASBs also enable real-time threat protection and data loss prevention for content traversing to or from the cloud. For ZTNA, CASB integration allows granular control over who can interact with cloud applications, under which circumstances, and with what permissions. Organizations can enforce authentication, runtime analytics, and detailed audit trails for all cloud interactions. 

Secure Web Gateway (SWG)

Secure web gateways (SWG) protect organizations by monitoring, filtering, and enforcing policies on internet-bound traffic. SWGs inspect web traffic for malware, phishing, and data leaks, and block access to dangerous or non-compliant websites. By integrating with ZTNA frameworks, SWGs help ensure that users only connect to approved resources, enforcing internet use policies in real time.

When combined with zero trust controls, SWGs offer consistent protection regardless of user location: on-premises, remote, or mobile. SWGs can apply contextual awareness by using identity and device posture in access decisions. This collaboration between SWG and other ZTNA components reduces the organization’s susceptibility to web-based threats.

Related content: Read our guide to zero trust security (coming soon)

ZTNA Deployment Models 

Agent-Based ZTNA

Agent-based ZTNA relies on clients installed on endpoints, such as laptops, smartphones, or tablets, to enforce access controls and communicate posture information to the ZTNA controller. Each agent gathers real-time data about the device’s security status, ensuring only compliant devices can connect to protected resources. 

This approach provides protection for both managed and unmanaged devices, including visibility and control over user activity. However, deploying and maintaining agents at scale presents operational challenges, particularly in organizations supporting a variety of device types. 

Agentless ZTNA

Agentless ZTNA provides secure access to applications without requiring the installation of any software on end-user devices. It often leverages browser-based access or reverse proxy technologies to authenticate users, check device posture using web standards, and broker connections between authorized users and internal or cloud apps. 

This model is particularly useful for third-party contractors, partners, or temporary users who need quick, seamless, and secure access. Agentless deployments reduce the complexity of onboarding users while lowering operational burdens associated with client installation and maintenance. However, agentless solutions may deliver limited monitoring or posture assessment capabilities compared to agent-based models.

Hybrid Approaches

Hybrid ZTNA approaches combine agent-based and agentless models to provide flexible access solutions for diverse user types and security requirements. Organizations may deploy agents on corporate-managed devices for deeper monitoring and control, while providing agentless access to partners, contractors, or unmanaged endpoints. 

Hybrid deployment offers a path to ZTNA adoption for organizations with complex environments, legacy systems, or mixed device ecosystems. It enables incremental rollout, providing security for internal assets while simplifying third-party access. The key challenge in hybrid models lies in maintaining consistent policies, monitoring, and visibility across both deployment types.

Challenges in Implementing ZTNA 

Legacy Infrastructure Integration

Integrating ZTNA with legacy infrastructure is often challenging due to incompatibility with outdated systems, lack of modern authentication support, or absence of APIs for orchestration. Many older applications are hardwired to work with perimeter-based security models and do not support dynamic policy enforcement or fine-grained access controls required by zero trust frameworks. 

Scalability and Performance

ZTNA solutions must scale to handle large and globally distributed user populations without introducing bottlenecks or latency. Scaling ZTNA involves provisioning access brokers, authentication services, logging platforms, and monitoring tools that can operate efficiently under heavy loads. If improperly sized or configured, these components can become choke points, impacting application availability, user satisfaction, and productivity.

User Experience Considerations

Transitioning to ZTNA can initially disrupt user workflows, especially if access control policies are too restrictive or poorly communicated. Increased authentication requirements, device compliance checks, and new access consoles may introduce friction, prompting dissatisfaction or workarounds. Negative user experiences risk driving shadow IT adoption, undermining security investments, and causing productivity setbacks.

Best Practices for ZTNA Solution Implementation 

Here are some of the ways that organizations can improve their ZTNA implementation.

1. Conduct a Comprehensive Asset and Identity Inventory

Before deploying ZTNA, organizations must establish a full inventory of assets, applications, users, and devices that require access. This includes mapping all data flows, identifying shadow IT, and classifying systems based on sensitivity and business criticality. A clear inventory allows administrators to define precise access policies and ensures no unmanaged or unknown entities are left unprotected.

Identity inventories should extend beyond employees to include contractors, partners, and service accounts. Integrating with existing IAM systems provides a centralized view of all identities, their associated privileges, and authentication methods. 

2. Apply Continuous Monitoring and Behavioral Analytics

ZTNA depends on constant visibility and real-time analytics to detect and respond to changing risks. Organizations should implement continuous monitoring of user activity, device posture, and access patterns to identify anomalies or policy violations. Behavioral analytics and automated alerting help security teams respond quickly to potential compromises or insider threats.

By applying behavioral analytics (UEBA), you can understand what ‘normal’ looks like for every user and automatically detect suspicious activity that bypasses even the best policies. This is the crucial feedback loop that makes your ZTNA deployment not just compliant, but secure.

3. Use Network Segmentation with Micro-Perimeters

Effective ZTNA design enforces segmentation down to the application level, creating micro-perimeters that isolate workloads and data based on trust zones. Each user or device is granted access only to specified applications or services, with all other network paths blocked by default. This minimizes lateral movement and limits the scope of potential breaches.

Organizations can implement segmentation through software-defined perimeters (SDP), microsegmentation technologies, or identity-based access controls. Policies should adapt dynamically to context, adjusting privileges as user posture or behavior changes. 

4. Align ZTNA with Regulatory and Compliance Needs

ZTNA deployment should align with applicable regulations such as GDPR, HIPAA, or PCI DSS, ensuring that data access and protection controls meet required standards. Detailed auditing, encryption, and least privilege enforcement help maintain compliance while improving overall security. Access logs and session data must be retained and reviewed regularly to demonstrate adherence to internal and external policies.

Integrating ZTNA reporting with governance, risk, and compliance (GRC) systems simplifies evidence collection during audits. Organizations should map ZTNA capabilities like authentication, segmentation, and continuous monitoring to regulatory requirements, ensuring a consistent compliance posture across hybrid and multi-cloud environments.

5. Regularly Test and Validate Access Policies

ZTNA policies should be continuously reviewed and validated to ensure they reflect current operational and security requirements. As users, devices, and applications evolve, outdated or overly broad policies can introduce gaps or unnecessary restrictions. Regular testing through red team exercises, access reviews, and simulated breaches verifies that controls perform as intended under realistic conditions.

Automated policy validation tools can identify redundant rules, detect policy conflicts, and assess compliance with organizational standards. Periodic audits and recertification of access rights prevent privilege creep and maintain least privilege alignment. Testing should be integrated into ongoing security operations, ensuring ZTNA remains effective over time.

Zero Trust with Exabeam

Exabeam’s security operations platform supports Zero Trust architectures by providing comprehensive telemetry and advanced analytics that complement core Zero Trust solutions. While not a primary Zero Trust provider, Exabeam specializes in ingesting data from various sources, including identity and access management systems, network devices, and endpoint security tools. This data collection is crucial for a Zero Trust model, as it supplies the granular information needed to continuously verify every access request and assess ongoing risk.

By leveraging behavioral analytics and machine learning, Exabeam can detect anomalies and suspicious activities that might indicate a compromise or a deviation from established Zero Trust policies. For instance, if a user attempts to access a resource from an unusual location, or if a device’s behavior deviates from its established baseline, Exabeam can flag these events. This capability provides essential context and alerts to security teams, enhancing their ability to respond to potential threats even within a “never trust, always verify” framework.

Ultimately, Exabeam helps integrate the vast streams of data generated within a Zero Trust environment into a cohesive security narrative. It aids in understanding the “who, what, when, and where” of access attempts and resource interactions. This contributes to the overall effectiveness of a Zero Trust strategy by ensuring that even subtle indicators of compromise are identified and brought to the attention of security personnel for informed decision-making and rapid response.