{"id":27020,"date":"2023-05-03T10:19:44","date_gmt":"2023-05-03T14:19:44","guid":{"rendered":"https:\/\/www.gtt.net\/?p=27020"},"modified":"2026-04-30T14:20:47","modified_gmt":"2026-04-30T18:20:47","slug":"what-is-zero-trust-network-access-ztna","status":"publish","type":"post","link":"https:\/\/www.gtt.net\/resources\/blog\/what-is-zero-trust-network-access-ztna\/","title":{"rendered":"What Is Zero Trust Network Access (ZTNA)?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Zero Trust Network Access (<\/span><a href=\"\/services\/secure-networking\/cloud-security\/zero-trust-network-access-ztna\/\"><span style=\"font-weight: 400;\">ZTNA<\/span><\/a><span style=\"font-weight: 400;\">), also known as the software-defined perimeter (SDP), is a network security solution that uses defined, granular access control policies to provide secure remote access to an organization\u2019s applications, services, and data. Unlike virtual private networks (VPNs) that grant access to all network resources, ZTNA authorizes access only to specific applications or services on a user profile basis.<\/span><\/p>\n<p><a href=\"\/resources\/whitepapers\/ztna-20-the-new-standard-for-securing-access\/\"><span style=\"font-weight: 400;\">ZTNA solutions<\/span><\/a><span style=\"font-weight: 400;\"> follow an explicit trust model, where trust is never assumed and access is authorized on a least-privilege, policy-defined, need-to-know basis. ZTNA enables secure access to private applications without placing users on the network or exposing the apps to the public internet.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As the number of remote and work-at-home users increases, ZTNA solutions can help eliminate security risks found in other remote access methods such as VPNs. Leading research and consulting firm <\/span><a href=\"https:\/\/www.zscaler.com\/gartner-zero-trust-network-access\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Gartner<\/span><\/a><span style=\"font-weight: 400;\"> estimates at least 70% of new remote access deployments will be served by <a href=\"https:\/\/www.gtt.net\/gb-en\/services\/secure-networking\/cloud-security\/zero-trust-network-access-ztna\/\">ZTNA solutions<\/a> instead of VPN services by 2025\u2014up from less than 10% at the end of 2021.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In this article, we will review the principles of ZTNA and different types of zero trust network access models. We will also cover the business benefits of ZTNA solutions delivered by experienced managed service providers such as <\/span><a href=\"\/\"><span style=\"font-weight: 400;\">GTT<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">How Zero Trust Network Access Works<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">ZTNA is a compilation of authentication technologies and functionalities that provide secure access to critical business applications for remote users. It also plays a key role in the secure access service edge (<\/span><a href=\"\/services\/secure-networking\/sase-secure-connect\/\"><span style=\"font-weight: 400;\">SASE<\/span><\/a><span style=\"font-weight: 400;\">) cybersecurity model, which is composed of next-gen firewall (NGFW), <\/span><a href=\"\/services\/secure-networking\/managed-sd-wan\/\"><span style=\"font-weight: 400;\">SD-WAN<\/span><\/a><span style=\"font-weight: 400;\">, secure web gateway (<\/span><a href=\"\/services\/secure-networking\/cloud-security\/secure-web-gateway-swg\/\"><span style=\"font-weight: 400;\">SWG<\/span><\/a><span style=\"font-weight: 400;\">), and other services in a cloud-based platform.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When <\/span><a href=\"\/services\/secure-networking\/cloud-security\/zero-trust-network-access-ztna\/\"><span style=\"font-weight: 400;\">ZTNA<\/span><\/a><span style=\"font-weight: 400;\"> is implemented:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">User access to specific applications or cloud environments is granted only after the user has been authenticated to the ZTNA service.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The ZTNA solution then allows the authorized user access, via an encrypted tunnel, to the specific application.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This zero trust architecture offers a secure connection by keeping applications invisible from unauthorized IP addresses.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In this way, ZTNAs rely on the same <\/span><a href=\"https:\/\/geekflare.com\/vpn-vs-sdp-vs-ztna\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">\u2018black cloud\u2019 idea<\/span><\/a><span style=\"font-weight: 400;\"> as SDPs by preventing application visibility from users who do not have valid access permissions. Additionally, if an attacker were to gain access to the corporate network, ZTNA, and its access policies protect against lateral movement and the ability to scan for other services.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Essentially, there are two approaches to a zero trust security model:<\/span><\/p>\n<p><b>Endpoint initiated<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An end user attempts to access an application from an endpoint device on which a software agent has been installed<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The agent communicates with the <a href=\"https:\/\/www.gtt.net\/gb-en\/services\/secure-networking\/cloud-security\/zero-trust-network-access-ztna\/\">ZTNA<\/a> controller<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The controller provides authentication and connects to the desired service<\/span><\/li>\n<\/ul>\n<p><b>Service initiated<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A connection is initiated by a broker between the user and the requested application (a lightweight ZTNA connector must reside in front of the on-premise or cloud-based business application)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The outbound connection from the application authenticates the user<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Traffic then flows through the ZTNA provider and isolates applications via a proxy from direct access<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Note:<\/b><span style=\"font-weight: 400;\"> This model does not require an agent on end-user devices, making it more attractive for unmanaged devices or bring-your-own-device (BYOD) access scenarios.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Likewise, there are two delivery models for implementing <a href=\"https:\/\/www.gtt.net\/gb-en\/services\/secure-networking\/cloud-security\/zero-trust-network-access-ztna\/\">zero trust network access<\/a>:<\/span><\/p>\n<p><b>Stand-alone ZTNA<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tasks the organization with deployment and management of all ZTNA elements<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Brokers secure connections at the edge of the data center or cloud environment<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Deployment, management, and maintenance may become cumbersome for organizations that are cloud-averse<\/span><\/li>\n<\/ul>\n<p><b>ZTNA-as-a-service (ZTNAaaS)<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Takes advantage of the cloud provider\u2019s infrastructure; the cloud service provider or <\/span><a href=\"\/resources\/whitepapers\/ztna-20-the-new-standard-for-securing-access\/\"><span style=\"font-weight: 400;\">ZTNA vendor<\/span><\/a><span style=\"font-weight: 400;\"> delivers the connectivity, capacity, and infrastructure for the solution<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Leverages the provider for all functionality, from deployment to policy enforcement<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Requires the organization to purchase user licenses and install ZTNA connectors<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Of the two delivery models, ZTNA-as-a-service simplifies management and deployment. It also ensures the lowest latency for users as a result of optimized traffic delivery. The benefits of this cloud-based delivery model are recognized by impacted organizations, as Gartner estimates over 90 percent are implementing ZTNAaaS.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">The Benefits of Bringing ZTNA to Your Business<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Information security leaders have struggled with many long-standing challenges, one of which is the difficulty of balancing security and user experience.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Most recently, the unprecedented demands that the COVID-19 pandemic has placed on IT and cybersecurity teams have tested their flexibility, creativity, and resolve. Providing access to business-critical applications with robust <\/span><a href=\"https:\/\/www.forbes.com\/sites\/forbestechcouncil\/2023\/04\/12\/the-practical-side-of-ztna-how-it-helps-harden-defenses\/?sh=2da54d96596a\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">protection from malware and hackers<\/span><\/a><span style=\"font-weight: 400;\"> has never been easy: the pandemic escalated the need for robust, user-friendly security solutions with flexible scalability.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Enter <\/span><a href=\"\/services\/secure-networking\/cloud-security\/zero-trust-network-access-ztna\/\"><span style=\"font-weight: 400;\">ZTNA<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The business benefits of a zero trust architecture are numerous, especially when a secure corporate network must support a remote workforce using cloud-hosted applications. Among the many benefits are:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ultimate control over access points<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Uninterrupted user experience<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flexible Security Features<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Server protection<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Trusted managed service providers such as <\/span><a href=\"\/\"><span style=\"font-weight: 400;\">GTT<\/span><\/a><span style=\"font-weight: 400;\"> can deliver these ZTNA benefits to your business.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Internal Authority Over Access Points<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Due to the ever-present cybersecurity threats facing businesses, ZTNA has emerged as a leading <\/span><a href=\"https:\/\/www.kuppingercole.com\/blog\/guest\/zero-trust-cisos-no-longer-need-to-choose-between-usability-and-security\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">security solution<\/span><\/a><span style=\"font-weight: 400;\"> for distributed workforces needing application access. Traditionally, VPNs have been somewhat effective in this regard, but do not provide the granular access policies needed to match user identity with specific application permissions.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With users logging in from different locations, multiple devices, and using various cloud services, it\u2019s never been so vital to manage the ways your network is accessed. That means:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Taking control of who\u2019s allowed on your network<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Deciding what they have access to<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Controlling how they\u2019re allowed to use it<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">With <\/span><a href=\"\/services\/secure-networking\/cloud-security\/zero-trust-network-access-ztna\/\"><span style=\"font-weight: 400;\">GTT\u2019s<\/span><\/a><span style=\"font-weight: 400;\"> zero-trust approach to authentication, you can prevent unauthorized intrusion and keep corporate data out of harm\u2019s way.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Uninterrupted User Experience<\/span><\/h3>\n<p><a href=\"https:\/\/www.mckinsey.com\/industries\/real-estate\/our-insights\/americans-are-embracing-flexible-work-and-they-want-more-of-it\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Remote work<\/span><\/a><span style=\"font-weight: 400;\"> is now a common business model for corporations. As with branch office environments, critical applications must be reliable and responsive to maximize end-user productivity.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">ZTNA provides a reliable, <\/span><a href=\"\/services\/secure-networking\/cloud-security\/zero-trust-network-access-ztna\/\"><span style=\"font-weight: 400;\">high-performance user experience<\/span><\/a><span style=\"font-weight: 400;\"> (UX) by permitting access to the network for authorized end users regardless of their location. With ZTNA, user traffic isn\u2019t backhauled through the data center. Instead, users experience speedy, uninterrupted access to the critical applications they need.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Flexible Security Features<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Not only does <\/span><a href=\"\/resources\/whitepapers\/ztna-20-the-new-standard-for-securing-access\/\"><span style=\"font-weight: 400;\">ZTNA<\/span><\/a><span style=\"font-weight: 400;\"> provide businesses with a scalable security service, but the features of a zero trust solution can also be adapted to fit the needs of the enterprise\u2019s application portfolio.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Flexible <\/span><a href=\"\/resources\/whitepapers\/whitepaper-sase-protects-a-changing-workplace-against-dynamic-threat-environments\/\"><span style=\"font-weight: 400;\">security features<\/span><\/a><span style=\"font-weight: 400;\"> that are common in ZTNA, and SASE, solutions include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Threat prevention<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Credential theft prevention<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Web filtering<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Data loss prevention<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">DNS security<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Next-generation firewall policies<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sandboxing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Adaptive Multi-Factor Authentication (MFA)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Micro-segmentation<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Experienced managed service providers such as <\/span><a href=\"\/\"><span style=\"font-weight: 400;\">GTT<\/span><\/a><span style=\"font-weight: 400;\"> can help you configure your ZTNA solution and <a href=\"https:\/\/www.gtt.net\/gb-en\/resources\/blog\/protect-your-perimeter-with-sase-framework\/\">SASE framework<\/a> to provide your business with the protection it needs.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Server Protection<\/span><\/h3>\n<p><a href=\"https:\/\/www.cisa.gov\/news-events\/news\/understanding-denial-service-attacks\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Distributed denial of service (DDoS)<\/span><\/a><span style=\"font-weight: 400;\"> attacks can paralyze an enterprise by flooding applications and network elements with unwanted or junk traffic, ultimately tying up system resources and crashing servers. Bad actors often utilize port scanning or other discovery methods to identify potential targets for attack.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To protect enterprise servers, <\/span><a href=\"https:\/\/www.gtt.net\/resources\/whitepapers\/ztna-20-the-new-standard-for-securing-access\/\"><span style=\"font-weight: 400;\">ZTNA<\/span><\/a><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inhibits application discovery on the internet via the creation of a virtual darknet; servers are secure from <a href=\"https:\/\/www.gtt.net\/es-es\/services\/secure-networking\/network-security-operations\/ddos-mitigation\/\">DDoS<\/a> attacks as well as other malware and internet-based threats to the business<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Allows segmentation of the corporate network into <\/span><a href=\"https:\/\/www.cloudflare.com\/learning\/access-management\/software-defined-perimeter\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">software-defined perimeters<\/span><\/a><span style=\"font-weight: 400;\">, which prevents lateral movement of threats and reduces the attack surface if a breach should occur<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Allows users access to critical applications while still protecting business servers<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Confidently Protect Your Network with GTT<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The business benefits of a zero trust architecture are numerous, especially when a secure corporate network must support a remote workforce using cloud-hosted applications. <\/span><a href=\"\/resources\/whitepapers\/ztna-20-the-new-standard-for-securing-access\/\"><span style=\"font-weight: 400;\">ZTNA<\/span><\/a><span style=\"font-weight: 400;\"> enables secure access to private applications without exposing the apps to the public internet or placing users on the network.<\/span><\/p>\n<p>ZTNA also plays a key role in the secure access service edge (<a href=\"\/services\/secure-networking\/sase-secure-connect\/\">SASE<\/a>) cybersecurity model, which is composed of next-gen firewall (NGFW), <a href=\"\/services\/secure-networking\/managed-sd-wan\/\">SD-WAN<\/a>, <a href=\"https:\/\/www.gtt.net\/gb-en\/services\/secure-networking\/cloud-security\/secure-web-gateway-swg\/\">secure web gateway<\/a> (<a href=\"\/services\/secure-networking\/cloud-security\/secure-web-gateway-swg\/\">SWG<\/a>), and other services in a cloud-based platform. As an experienced provider of these services, <a href=\"\/\">GTT<\/a> can deliver the solutions you need to grow and secure your business. <a href=\"\/contact-us\/\">Contact us<\/a> today to learn more.<\/p>\n<hr style=\"height: 2px; background: #4ED869; margin: 20px 0;\" \/>\n<p>Interested in learning more about GTT&#8217;s Zero Trust Network Access (ZTNA)?<\/p>\n<p><a href=\"\/contact-us\/\">Connect with our experts<\/a> and ask us for a demo of Zero Trust Network Access (ZTNA) to gain a firm foothold in the security landscape.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Managing application access with a zero trust network access (ZTNA) solution has never been more important to your business.<\/p>\n","protected":false},"author":58,"featured_media":31986,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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Is Zero Trust Network Access (ZTNA)?","url":"http:\/\/www.gtt.net\/resources\/blog\/what-is-zero-trust-network-access-ztna\/","mainEntityOfPage":{"@type":"WebPage","@id":"http:\/\/www.gtt.net\/resources\/blog\/what-is-zero-trust-network-access-ztna\/"},"thumbnailUrl":"https:\/\/www.gtt.net\/wp-content\/uploads\/2023\/11\/iStock-970812654-1.jpg?w=300&h=300&crop=1","image":{"@type":"ImageObject","url":"https:\/\/www.gtt.net\/wp-content\/uploads\/2023\/11\/iStock-970812654-1.jpg"},"articleSection":"Blog","author":[{"@type":"Person","name":"GTT Editorial Team"}],"creator":["GTT Editorial Team"],"publisher":{"@type":"Organization","name":"GTT","logo":"https:\/\/www.gtt.net\/wp-content\/uploads\/2024\/09\/gtt-logo-2x-2024.png"},"keywords":[],"dateCreated":"2023-05-03T14:19:44Z","datePublished":"2023-05-03T14:19:44Z","dateModified":"2026-04-30T18:20:47Z"},"rendered":"<script type=\"application\/ld+json\" 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