Network Security Best Practices

The attack surface has never been larger. With 88% of organizations now operating across hybrid or multicloud environments, IT and security teams are defending infrastructure spread across data centers, public clouds, and remote endpoints — all at once. Traditional perimeter-based security wasn't built for this.

I've seen firsthand how organizations that treat network security as a checklist item end up responding to breaches rather than preventing them. The data backs this up: 51% of organizations confirmed experiencing a security incident in the past 12 months that required a dedicated response, and 75% reported financial damage as a direct result.

The good news? The path forward is well-defined. The following network security best practices give enterprise IT teams a practical, prioritized starting point — whether you're securing on-prem infrastructure, a hybrid cloud environment, or workloads spread across multiple cloud providers.

What is Network Security?

Network security refers to the policies, tools, and controls that protect the integrity, confidentiality, and availability of a network and its data. It spans hardware and software, user access, traffic monitoring, threat detection, and incident response.

In modern enterprise environments, effective network security isn't a single product or policy — it's a layered strategy that addresses identity, access, visibility, and resilience across every environment where workloads run.

Network Security Best Practices

1. Adopt a Zero Trust Architecture

Zero Trust is the most important strategic shift in enterprise network security today, and the industry has reached a clear consensus: 96% of organizations are already pursuing or have committed to a Zero Trust strategy, and 81% plan to implement it within the next 12 months.

The core principle is simple — never trust, always verify. No user, device, or workload gets implicit access to any part of the network, regardless of location.

In practice, Zero Trust means:

• Verifying every access request with identity-based controls, regardless of whether the request originates inside or outside the network

• Applying least-privilege access so users and services can only reach the resources they specifically need

• Microsegmenting the network to prevent lateral movement if a breach does occur

• Continuously validating session integrity rather than relying on one-time authentication

Organizations pursuing Zero Trust report a clear business case beyond security. 63% cite reduced breach impact as their top driver, while 41% point to greater operational agility. Zero Trust isn't just a security framework — it's a modernization strategy.

2. Enforce Multi-Factor Authentication (MFA) Everywhere

Compromised credentials remain one of the most common entry points for attackers. MFA adds a critical second layer of verification — requiring users to confirm their identity through something they have (a device or token) or something they are (biometrics), in addition to their password.

Where to enforce MFA:

• All remote access connections, including VPN and remote desktop

• Admin and privileged accounts — these should be non-negotiable

• Cloud console access across every provider

• SaaS applications that store or process sensitive data

• Email platforms, which are common phishing targets

MFA implementation should also account for the shift away from SMS-based codes, which are vulnerable to SIM swapping. Authenticator apps, hardware tokens, and passkey-based authentication offer stronger protection for high-risk access points.

3. Segment Your Network

Network segmentation divides infrastructure into isolated zones, containing threats and limiting how far an attacker can move if they gain access. In a flat network, a single compromised endpoint can expose everything. Segmentation changes that equation.

A practical segmentation approach includes:

• Separating workload types — production, development, and testing environments should not share the same network segment

• Isolating sensitive systems — financial data, patient records, and intellectual property warrant dedicated, tightly controlled zones

• Segmenting by user role — contractors, guests, and vendors should operate in limited-access network segments with no path to core infrastructure

• Applying microsegmentation in cloud and virtualized environments to enforce controls at the workload level, not just at the network perimeter

For organizations running across hybrid environments, consistent segmentation policy is especially important. Nearly half (49%) of IT teams report struggling with consistently enforcing cloud security across hybrid and on-premises environments. Centralized segmentation policy management, enforced at the platform level, directly addresses this gap.

4. Keep Systems Patched and Updated

Unpatched systems are low-hanging fruit for attackers. Vulnerabilities in operating systems, applications, and network devices give adversaries a reliable path to compromise — and most exploited vulnerabilities have patches available before they're used in an attack.

A strong patching program requires:

• A current asset inventory. You can't patch what you don't know exists. Maintain a real-time view of every device, virtual machine, container, and cloud workload in your environment.

• Prioritized patch scheduling. Not all vulnerabilities carry the same risk. Focus on critical and high-severity CVEs first, especially those with known active exploits.

• Automated patching where possible. For endpoints and servers running standard configurations, automated patch deployment significantly reduces the window between disclosure and remediation.

• Patching cloud-native workloads. Containers, serverless functions, and cloud instances still require patching. Build image updates and dependency scanning into your CI/CD pipeline.

• Testing before deployment. In production environments, patches should be validated in staging first to avoid breaking critical services.

Patching discipline is one of the highest-return investments in network security — addressing a core vulnerability class without requiring advanced tooling.

5. Monitor Networks Continuously and in Real Time

Visibility is the foundation of effective defense. An attacker who gains access to a network doesn't always make noise immediately — lateral movement, data staging, and credential harvesting can unfold across days or weeks without triggering obvious alerts. Continuous monitoring changes the detection window.

The industry recognizes this: 80% of security leaders say network-derived telemetry is critical for securing AI and hybrid cloud environments, and 85% view deep observability as essential to hybrid cloud security.

What continuous monitoring looks like in practice:

• Security Information and Event Management (SIEM) platforms that aggregate, correlate, and analyze log data across network devices, cloud workloads, and endpoints

• Network Detection and Response (NDR) tools that analyze traffic patterns to identify anomalous behavior and lateral movement

• East-West traffic monitoring inside hybrid environments, where traditional perimeter tools have no visibility

• Automated alerting and response to reduce mean time to detect (MTTD) and mean time to respond (MTTR)

• Unified dashboards that give security teams a consolidated view across on-prem and cloud environments

64% of security teams are prioritizing real-time monitoring in 2025 as a direct response to growing hybrid complexity. Teams that invest in observability now will detect and contain threats faster than those relying on periodic log reviews.

6. Control and Audit Privileged Access

Privileged accounts — system admins, cloud console operators, database owners — present the highest risk when compromised. Privileged Access Management (PAM) solutions enforce strict controls on who can access sensitive systems and under what conditions.

Core PAM practices include:

• Just-in-time (JIT) access provisioning — grants elevated permissions only when needed and revokes them automatically after use

• Session recording and auditing — all privileged activity should be logged and reviewable for forensic and compliance purposes

• Credential vaulting — privileged passwords and API keys should be stored in a secure vault, rotated automatically, and never shared

• Separation of duties — no single account should have the ability to both make and approve sensitive changes

Privileged access controls are especially critical in multicloud environments where a single misconfigured IAM policy can expose workloads across multiple platforms simultaneously.

7. Establish and Test an Incident Response Plan

Network security best practices aren't complete without a plan for when things go wrong. 60% of organizations expect to experience a significant cyber incident within the coming year. The difference between a contained breach and a catastrophic one often comes down to how quickly and effectively a team can respond.

A strong incident response plan includes:

• Defined roles and responsibilities — who declares an incident, who leads technical response, who handles communication

• Runbooks for common scenarios — ransomware, credential compromise, cloud misconfiguration, insider threat

• Escalation paths and communication protocols — both internal (CISO, legal, executive) and external (customers, regulators, law enforcement)

• Regular tabletop exercises — simulate breach scenarios with the full response team to identify gaps before a real incident forces the issue

• Post-incident reviews — every significant incident should produce documented lessons and concrete process improvements

Testing the plan is as important as having one. A response plan that's never been exercised under pressure will fail when it matters most.

Best Practices for Hybrid and Multicloud Network Security

Hybrid and multicloud architectures introduce unique security challenges that go beyond the best practices above. Policies enforced on-premises don't automatically extend to cloud workloads. Each cloud provider operates a different security model. And 55% of enterprises now select cloud platforms primarily based on security capabilities — a clear signal that security is no longer an afterthought in cloud strategy.

For organizations operating across hybrid cloud environments, consistent policy enforcement is the core challenge. Security controls — identity, segmentation, monitoring, access — need to apply uniformly regardless of where a workload runs.

This is exactly where Nutanix's approach to hybrid multicloud security provides a meaningful advantage: a consistent infrastructure platform that extends security visibility and policy control from on-prem to every cloud environment, without requiring separate toolsets for each.

Start with the Fundamentals

Network security best practices don't require a single, sweeping transformation. The most resilient organizations build layered defenses methodically — starting with the fundamentals that address the highest-probability threats.

• Adopt Zero Trust principles and enforce least-privilege access

• Require MFA for all remote, privileged, and cloud access

• Segment networks to contain lateral movement

• Patch consistently and prioritize known exploited vulnerabilities

• Monitor continuously with east-west visibility across every environment

• Control privileged access with vaulting, JIT provisioning, and full auditing

• Test incident response plans before you need them

I'd argue the organizations that handle breaches best aren't those with the most sophisticated tools — they're the ones that execute the basics with discipline and consistency. That discipline, applied across hybrid and multicloud environments, is what separates a contained incident from a business-defining one.

Quick Checklist (One‑Screen Summary)

• Zero Trust enforcement across all environments

• Least‑privilege access for every identity

• MFA everywhere — remote, privileged, cloud

• Unified identity across on‑prem + cloud

• Consistent segmentation across clouds

• Continuous monitoring with east‑west visibility

• Patching + vulnerability management on a fixed cadence

• Privileged access controls (vaulting, JIT, auditing)

• Incident response readiness with tested playbooks

• Cloud‑specific policy alignment to avoid drift

• Consistent tooling across hybrid/multicloud

• Visibility across all workloads regardless of location

Ready to go deeper on securing your hybrid cloud infrastructure? Explore Nutanix's approach to hybrid cloud security and learn how a unified platform can eliminate the visibility gaps that put your environment at risk.