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[Cyberpedia](https://www.paloaltonetworks.com/cyberpedia?ts=markdown) 2. [Cloud Security](https://www.paloaltonetworks.com/cyberpedia/cloud-security?ts=markdown) 3. [What is Zero Trust Network Security?](https://www.paloaltonetworks.com/cyberpedia/what-is-zero-trust-network-security?ts=markdown) Table of contents * [Context-Based Access](#context-based-access) * [Safe Access](#safe-access) * [Consistent Access and Security, Available Globally](#consistent-access-and-security-available-globally) # What is Zero Trust Network Security? 3 min. read Table of contents * [Context-Based Access](#context-based-access) * [Safe Access](#safe-access) * [Consistent Access and Security, Available Globally](#consistent-access-and-security-available-globally) 1. Context-Based Access * [1. Context-Based Access](#context-based-access) * [2. Safe Access](#safe-access) * [3. Consistent Access and Security, Available Globally](#consistent-access-and-security-available-globally) The abrupt shift to remote work spurred by the COVID-19 pandemic is evolving toward a permanently hybrid workforce, and the applications powering business outcomes are increasingly in the cloud. The business world is at an inflection point where users access data from where they are -- working from anywhere to stay productive. In an increasingly digital world, organizations are exploring new, more robust ways to protect their business against emerging threats, including Zero Trust Network Security. Zero Trust Network Security is one element of [Zero Trust](https://www.paloaltonetworks.com/zero-trust?ts=markdown), a strategic approach to cybersecurity that secures an organization's data, assets, and people by continuously validating every digital interaction. As the name suggests, Zero Trust Network Security is the part that applies to users and devices accessing applications, data, and their security needs. Zero Trust Network Security enables business users to securely interact with any application from any device in any environment. At the heart of Zero Trust Network Security is a simple concept: The user, who may be using any device, transacts with an application, which may be anywhere. ![A horizontal flowchart begins on the left with a 'All Users \& Devices' section showing a central circle labeled 'Employees / Contractors / Partners' surrounded by icons for 'BYOD,' 'Home PC,' and 'Work Laptop.' An arrow points right to an 'All Locations' column featuring 'Campus,' 'Home,' and 'On the Go' icons. The flow continues into a green dashed box labeled 'Consistent Access Control \& Security' containing the text 'Access control to all apps,' 'Security for users, devices, apps, data,' and 'Applied Everywhere.' The final stage on the right, labeled 'All Apps \& Internet,' shows dotted lines connecting to 'Internet,' 'SaaS Apps,' and 'Enterprise Apps' icons.](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/zero-trust-network-security-1.png) **Figure 1.** Zero Trust Network Security provides consistent access control and security regardless of where users, devices or applications are located. To achieve Zero Trust Network Security, three core capabilities are required: * Provide context-based access * Make access safe * Provide consistent access and security, and make it globally available ## Context-Based Access Organizations that aim to successfully achieve Zero Trust Network Security must be able to apply context-based access. This means the access to applications and data must be based on complete context that includes the user, device and application. Context includes: * Verifying the user identity to determine who is requesting access * Verifying the integrity of the device the user is using to request access * Identifying the applications or resources being accessed Context-based access must be applied to all applications no matter where they are located, whether that's in corporate [data centers](https://www.paloaltonetworks.com/cyberpedia/what-is-a-data-center?ts=markdown), public cloud environments, SaaS or the internet at large. When every access policy decision considers the user, device and application context, organizations are better able to ensure consistent security and user experience. Context-based access requires advanced technology, including a cloud identity engine and SaaS security. A cloud identity engine can make it easy to consistently authenticate user identity and authorize users regardless of where user identity lives -- on-premises, in the cloud or a hybrid of the two. An [integrated cloud access security broker (CASB)](https://www.paloaltonetworks.com/blog/2021/05/saas-security-integrated-casb/?ts=markdown) allows organizations to proactively extend secure access to all SaaS applications. ![Three grey vertical panels categorize security coverage elements. The left panel, titled 'ALL Users' under a circular icon of a person and group, lists 'Contractor,' 'Employee,' and 'Partner.' The middle panel, titled 'ALL Devices' under an icon displaying a monitor, laptop, and phone, lists 'BYOD,' 'Corp Laptop,' and 'Home PC.' The right panel, titled 'ALL Applications' under a grid icon, lists 'Enterprise Apps,' 'Internet,' and 'SaaS.' Orange diagonal hatch marks appear at the bottom of each panel.](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/zero-trust-network-security-2.png) **Figure 2.** Every access policy decision should be made based on complete context and with verified knowledge of user identities, devices, and applications. ## Safe Access A true Zero Trust architecture not only enables access to the right applications and data but also secures that access. This means it prevents vulnerability exploits, tunneling, malware, phishing and malicious websites. To make access safe for all users, devices, apps and data, organizations must continuously examine all content to prevent malicious activity and secure enterprise data. Zero Trust Network Security employs comprehensive security monitoring for all users, devices, apps and data to detect malicious activity across the business, IT and security infrastructure. The required technology for safe access includes [Advanced URL Filtering](https://www.paloaltonetworks.com/network-security/advanced-url-filtering?ts=markdown) to prevent zero-day web attacks. Safe access also requires [DNS Security](https://www.paloaltonetworks.com/network-security/advanced-dns-security?ts=markdown) capabilities to prevent [emerging DNS attacks](https://www.paloaltonetworks.com/blog/2021/05/netsec-dns-attacks/?ts=markdown) (such as DNS-layer network attacks) and data exfiltration techniques (such as dangling DNS and ultra-slow [tunneling](https://www.paloaltonetworks.com/cyberpedia/what-is-dns-tunneling?ts=markdown)), which are used to exploit networks and quietly steal data. ![A graphic titled 'Secure ALL users, devices and applications against threats' displays a top row of five icons labeled 'Exploits,' 'Malware,' 'Phishing,' 'Malicious Websites,' and 'Data Loss.' Below these icons, two dashed rectangular boxes contain bulleted lists of specific threats. The left box lists 'Vulnerability Exploits,' 'Phishing \& Email Compromise,' 'Malicious Downloads,' 'Host Compromise,' and 'Lateral Movement.' The right box lists 'C2,' 'Behavioral Indicators,' 'User/Device Risk,' 'Social Engineering,' and 'Shadow IT.'](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/zero-trust-network-security-3.png) **Figure 3.** A true Zero Trust architecture secures all users, devices, and applications against vulnerability exploits, tunneling, malware, phishing and malicious websites. ## Consistent Access and Security, Available Globally To accomplish Zero Trust Network Security, the access and security core capabilities described above must be available everywhere users and devices live and work. Access and security must be consistent. The location of the user, device or application should not matter. This will allow all users to use any device to securely access any application they need to perform their job. This can [safeguard productivity and be a powerful business enabler](https://start.paloaltonetworks.com/zero-trust-security-series). The technology needed to reach consistent access and security at a global level includes [next-generation firewalls](https://www.paloaltonetworks.com/network-security/next-generation-firewall?ts=markdown) (for context-based access and security on-premises, in the cloud and remote environments) and an open, programmable and highly scalable platform. ![A diagram illustrates a security flow starting on the left with three location icons labeled 'Campus,' 'Home,' and 'On the Go,' collectively grouped as 'All Locations.' Dotted lines trace from these locations to a central green dashed box labeled 'Consistent Access Control \& Security,' which contains three stacked rectangles reading 'Access control to all apps,' 'Security for users, devices, apps, data,' and 'Applied Everywhere.' From this central security block, dotted lines extend to the right, connecting to three circular icons representing destinations: 'Internet,' 'SaaS Apps,' and 'Enterprise Apps,' which are grouped under the label 'All Apps \& Internet.'](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/zero-trust-network-security-4.png) **Figure 4.** Access and security must be consistent and available everywhere the users and devices live and work. As users embrace a hybrid workplace, Palo Alto Networks is uniquely positioned to deliver on the promise of Zero Trust. For your workforce that will spend all or part of their time being remote and a part of their time at the workplace, you can optimize the user experience by leveraging consistent capabilities across our cloud native service, hardware and software form factors. Learn how Palo Alto Networks enables businesses to adopt Zero Trust across the network security stack by watching the [Complete Zero Trust Network Security](https://start.paloaltonetworks.com/zero-trust-security-series) event series. ![Icon of a report](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/sase-architecture/icon-report.svg) ## Start Your Zero Trust Journey Read the latest Gartner research that guides leaders in converging networking and security with single or dual-vendor SASE to replace legacy systems [Download the roadmap](https://www.paloaltonetworks.com/resources/research/gartner-2025-strategic-roadmap-sase-convergence) Related content [Video: Complete Zero Trust Network Security Learn why a Zero Trust approach is needed to unlock productivity and enable business by giving every user safe access to any application from any location.](https://start.paloaltonetworks.com/zero-trust-security-series) [Zero Trust Enterprise Cuts Risk \& Complexity In one location, gain a comprehensive understanding of Zero Trust Enterprise, including key features, architecture, benefits, the state of Zero Trust today, and how to get started.](https://www.paloaltonetworks.com/zero-trust?ts=markdown) [Adopt SASE to Secure Hybrid Workers and Cloud Services Latest Gartner research helps leaders converge networking and security with a single- or dual-vendor SASE solutions to replace legacy perimeter systems, in our view.](https://www.paloaltonetworks.com/resources/research/gartner-2025-strategic-roadmap-sase-convergence) ![Share page on facebook](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/facebook-circular-icon.svg) ![Share page on linkedin](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/linkedin-circular-icon.svg) [![Share page by an email](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/email-circular-icon.svg)](mailto:?subject=What%20is%20Zero%20Trust%20Network%20Security%3F&body=Zero%20Trust%20Network%20Security%20is%20a%20pillar%20of%20Zero%20Trust%20based%20on%20continuously%20validating%20every%20digital%20interaction%20within%20the%20security%20infrastructure%20instead%20of%20trusting%20users%20based%20on%20where%20they%20are%20relative%20to%20the%20network.%20at%20https%3A//www.paloaltonetworks.com/cyberpedia/what-is-zero-trust-network-security) Back to Top {#footer} ## 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