Microsegmentation and Zero Trust: How to Accelerate Security Roadmaps

Data breach notices jumped more than 300% last year, ransomware attacks have already doubled so far in 2025, and nearly three-quarters of security leaders say they’re facing increasingly sophisticated cyber risks. The takeaway? Traditional network security strategies no longer cut it.

In an era where cyber threats and enterprise networks are constantly evolving, Zero Trust is a critical security building block – not a buzzword. Still, 90% of organizations have yet to achieve an advanced level of cyber resilience as they struggle to operationalize Zero Trust strategies, despite recognizing microsegmentation as key to success.

Using insights from 260+ IT and security leaders, we’ll dig into the importance of Zero Trust in cybersecurity today, how microsegmentation accelerates Zero Trust maturity, and key capabilities to leave traditional microsegmentation challenges behind and bring advanced Zero Trust milestones within reach.

What Is Zero Trust? Redefining Network Security

Zero Trust security is a cybersecurity strategy that distrusts all traffic by default, even if it’s already inside the network perimeter. Zero Trust upends traditional perimeter-based approaches to network security by removing implicit trust and requiring continuous verification of users, devices, and access requests. Rather than assuming internal traffic is trustworthy, Zero Trust assumes breach.

The Zero Trust model is built on core principles like:

• Never trust, always verify: Every request is treated as risky until proven otherwise.
• Least privilege access: Users, devices, and applications get only the access they need – nothing more.
• Assume breach: Networks are designed with the expectation that attackers will breach perimeter defenses.

As modern networks sprawl across data centers, clouds, branch locations, remote endpoints, and everything in between, implementing Zero Trust to prevent unauthorized lateral movement and cut off attackers’ pathways has never been more important.

Today, 64% of organizations connect more than 5,000 assets to their corporate networks. Tasked with securing such complex and ever-expanding infrastructures, it’s easy to see why 90% of cyber professionals consider Zero Trust key to improving cybersecurity posture.

This widespread emphasis on Zero Trust marks an important shift in prevailing cybersecurity sentiments. Dr. Chase Cunningham, aka Dr. Zero Trust, says it’s encouraging to see 90% of security leaders embrace Zero Trust: “If we compare this to five years ago, it would be pretty much the other side of the coin."

Zero Trust Security vs. Zero Trust Architecture: What’s the Difference?

Zero Trust security refers to an overarching philosophy that removes inherent trust for anything inside or outside the network.

Zero Trust architecture (ZTA) refers to the implementation of that philosophy within an organization’s infrastructure, workflows, controls, and policies.

The NIST 800-207 special publication on Zero Trust architecture explains the nuance this way:

“Zero trust (ZT) provides a collection of concepts and ideas designed to minimize uncertainty in enforcing accurate, least privilege per-request access decisions in information systems and services in the face of a network viewed as compromised. Zero trust architecture (ZTA) is an enterprise’s cybersecurity plan that utilizes zero trust concepts and encompasses component relationships, workflow planning, and access policies. Therefore, a zero trust enterprise is the network infrastructure (physical and virtual) and operational policies that are in place for an enterprise as a product of a zero trust architecture plan.”

The NSA's Zero Trust Reference Architecture is one of the most widely referenced frameworks for operationalizing Zero Trust, outlining seven core Zero Trust pillars that collectively reduce risk, contain threats, and bolster cyber resilience.

Zero Trust Pillars Explained: NSA’s 7-Pillar Model

The pillars the NSA ranks as essential for building a mature Zero Trust environment are:

• User: Continuous authentication and behavioral monitoring of users
• Device: Evaluation of asset health, compliance, and posture
• Applications & Workload: Protection for applications, containers, and services
• Data: Tightly controlling access to sensitive data while enabling transparency and visibility
• Network & Environment: Segmentation and isolation of the network with granular policy and access controls
• Automation & Orchestration: Adaptive security responses enabled by dynamic automated processes
• Visibility & Analytics: Monitoring and analysis of network behavior and events to inform access decisions

Notably, 75% of security leaders say the NSA’s model is optimal for realizing Zero Trust security outcomes – and they’re focused on two pillars in particular. Cyber pros say the Data and Network & Environment Pillars are most critical to Zero Trust, with 89% rating each of these pillars as “extremely important” or “very important.”

To strengthen these key pillars, security teams can lean on guidance from Zero Trust models which call out network segmentation as a foundational strategy.

How Network Segmentation Advances Zero Trust

Network segmentation divides a network into smaller, secure subnetworks or zones, each with its own access controls and security policies. In turn, network segmentation adheres to the Zero Trust guidance to treat every request – whether from a user, device, or application – as potentially malicious.

Crystal Chadwick, Customer Engineer at Zero Networks, explains how network segmentation upholds Zero Trust principles: “Segmentation helps implement Zero Trust by limiting what’s accessible to any user or device at any time. Even if an attacker gains entry, they’re effectively trapped within that segment and cannot move laterally to access more sensitive systems.”

Both the NSA and CISA Zero Trust frameworks highlight segmentation as essential to achieving Zero Trust. The NSA places it at the center of the Network & Environment pillar, requiring organizations to isolate systems and apply dynamic, risk-based access policies. CISA echoes this guidance in its Zero Trust Maturity Model, emphasizing segmentation as a key capability for mitigating unauthorized access.

Organizations evidently understand the importance of network segmentation for Zero Trust – over 90% are currently using or planning to use network segmentation as part of their Zero Trust strategy.

While any level of network segmentation is a useful Zero Trust stepping stone, not all methods are created equal – many organizations still rely on basic segmentation approaches, inevitably slowing their Zero Trust journey.

Top Network Segmentation Strategies for Zero Trust

Sixty-five percent of organizations are using network segmentation today; of that group, nearly three-quarters rely on firewalls and VLANs to segment their networks.

Network segmentation aligns perfectly with Zero Trust principles by dividing the network into tightly controlled zones and preventing unrestricted access, so any degree of network segmentation is a step in the right direction. However, traditional segmentation methods like VLANs present limitations that make it difficult to implement the key tenets of Zero Trust at scale. As Chadwick succinctly puts it, “A VLAN is a very simple but ineffective way to separate networks.”

Traditional firewalls and VLANs are typically static, prone to misconfigurations, and difficult to scale across hybrid environments. They can segment broad zones but can’t provide the granular, identity-aware controls needed to enforce least privilege across the entire network.

To mature Zero Trust, segmentation strategies must evolve.

Zero Trust Microsegmentation: Evolving Network Security

While traditional network segmentation approaches divide a large network into smaller segments, microsegmentation is a much more granular and robust process of isolating all clients, workloads, applications, virtual machines, and operating systems into separate segments with individual security perimeters and policies.

It’s no secret that microsegmentation is the network security gold standard – and vital for accelerating Zero Trust. About three-quarters of security leaders say microsegmentation is important for cyber defense; nearly 70% agree it’s key to realizing Zero Trust.

Why Is Microsegmentation Important for Zero Trust?

Microsegmentation strengthens Zero Trust pillars like:

• Network & Environment: By isolating every asset, microsegmentation reduces the risk of lateral movement and instantly contains breaches.
• Data: When paired with identity segmentation, microsegmentation restricts access to sensitive data by tightly controlling who (or what) can access specific assets, enforcing least privilege by design.
• Automation & Orchestration: Next-gen microsegmentation solutions support policy automation and adaptive enforcement, scaling alongside network changes.

Still, holistic network segmentation is difficult to achieve with legacy tools – that’s why so many organizations still rely on traditional segmentation solutions, and why the NSA still classifies microsegmentation as an advanced strategy.

Zero Trust Roadblocks: Key Microsegmentation Challenges

Despite the widespread understanding that microsegmentation means built-in Zero Trust, just 5% of organizations are microsegmenting their networks today. What’s driving the disconnect?

Security leaders cite myriad concerns about implementing microsegmentation – all of which echo well-known and long-standing challenges with legacy microsegmentation solutions.

The top reported concerns with implementing microsegmentation are:

• Implementation complexity
• Disruption to existing operations
• Dealing with legacy applications

To effectively curb these challenges and advance Zero Trust initiatives beyond early stages, security leaders must set their sights on next-gen microsegmentation.

How to Implement Zero Trust Microsegmentation

The key to unlocking Zero Trust microsegmentation lies in simplicity. Security teams can leave complex, labor-intensive, and never-ending microsegmentation implementations in the past by prioritizing capabilities like automation, agentless deployment, and MFA.

IT and security leaders recognize these factors as key to simplifying microsegmentation on their Zero Trust journeys – MFA overlay, automated policy creation, and agentless deployment are cited as the most important capabilities for a microsegmentation solution.

Here’s how modern capabilities like these translate to streamlined microsegmentation implementation, and in turn, an accelerated Zero Trust journey:

• Automated asset tagging and grouping: Manually creating tags or labels for every asset is incredibly time-consuming and labor-intensive. By intelligently and accurately automating this process, security teams can remove a key barrier to entry and ensure microsegmentation projects don’t stall before they truly start.
• Hands-free policy creation: Modern microsegmentation solutions can automatically create, enforce, and manage deterministic, highly accurate rules and policies based on learned network behavior, drastically reducing implementation complexity, ongoing management burdens, and the risk of misconfiguration.
• Layered identity-aware access controls: Microsegementation solutions with built-in identity segmentation and MFA capabilities directly strengthen Zero Trust pillars related to network, data, and identity by ensuring all users, service accounts, and devices are governed by least privilege access. Network layer MFA even scales just-in-time verification to non-SaaS assets to secure every port, protocol, and application, erasing the legacy tech challenges so many organizations report as top barriers to microsegmentation.
• Agentless architecture: With an agentless approach, next-gen microsegmentation can be deployed quickly across diverse environments without the need to install software on every endpoint. This not only ensures consistent policy enforcement across on-premises, cloud, and hybrid infrastructures, but also eases concerns that microsegmentation will disrupt operations or break critical network connections.

With modern microsegmentation capabilities, organizations can take a shortcut through the Zero Trust roadmap, leapfrogging early steps like rough segmentation and building mature Zero Trust architectures in record time.

“I tell people with automation and an agentless capability, microsegmentation doesn't have to be at the end of the road anymore – it can actually now be at the front.”

- Nicholas DiCola, VP of Customers at Zero Networks

A Unified Solution for Effortless Zero Trust Microsegmentation

With Zero Networks, organizations can achieve effortless Zero Trust microsegmentation with a single comprehensive solution. By combining identity segmentation, adaptive policy automation, network layer MFA, and agentless deployment, Zero Networks enables organizations to:

• Segment every asset in a click
• Automatically enforce least privilege access everywhere
• Block lateral movement and contain breaches in real time
• Build Zero Trust principles into the network architecture without disrupting operations

When it comes to Zero Trust, it’s time to rethink what’s possible. Learn how Zero Networks makes microsegmentation effortless and brings Zero Trust within reach – take a self-guided product tour.