What Is SASE & Why Does It Matter for Enterprise Security?

Cloud adoption, the hybrid workforce and digital transformation have changed the way organisations operate. Employees access applications from multiple locations, data is increasingly stored in the cloud and businesses must support growing numbers of connected devices.

These changes have exposed limitations in traditional network security models that were designed around a central office network. As a result, IT leaders are increasingly exploring SASE security as a way to simplify security and networking while supporting a modern workforce.

By bringing networking and security capabilities together in a cloud-delivered architecture, SASE helps organisations provide secure access to applications, data and services regardless of where users are located. For organisations reviewing their wider security posture, SASE also plays an important role within broader enterprise network security and cybersecurity strategies.

Discover how Viatel Network Security can help you protect users, applications and data across your organisation.

What is SASE (Secure Access Service Edge)?

The term Secure Access Service Edge is an architectural approach that combines network connectivity and security services into a single framework.

Historically, users worked primarily from offices and accessed resources through a corporate network. Security controls were concentrated around that network perimeter. Today, organisations rely on:

• Cloud applications and services
• Remote and hybrid workers
• Mobile devices
• Branch offices
• Distributed workloads

As users and applications have moved beyond traditional office networks, businesses have needed a different way to protect data and manage access.

SASE addresses this challenge by delivering networking and security services through the cloud. Rather than treating security and networking as separate disciplines, it brings them together to help organisations provide secure, consistent access wherever users work.

This is one reason SASE has become an increasingly important topic for CIOs, CISOs and IT managers planning future network, cloud security and cybersecurity strategies.

Why Are Businesses Moving Towards SASE?

Several business and technology trends are driving adoption of SASE solutions.

• Increased cloud adoption
• Growth in the hybrid workforce and distributed workforce
• Users connecting from different devices and locations
• Increasing complexity across networking and security environments

The challenge for many organisations is that applications are no longer hosted within a single corporate data centre. Employees may need access from branch offices, home offices, customer locations and while travelling.

At the same time, security teams must ensure policies remain consistent regardless of where users connect.

Many businesses are also dealing with multiple networking, firewall and security management platforms. Operating disconnected tools can create additional complexity, reduce visibility and increase administrative effort.

SASE offers a more integrated approach by bringing networking and security considerations together within a single framework, helping organisations improve both operational efficiency and security governance.

How Does SASE Work?

SASE focuses on identity and policy-based access.

The process can be explained in four simple steps:

1. A user attempts to access an application or business resource.
2. Identity, device and contextual information are evaluated.
3. Security policies are applied.
4. Secure access is provided to authorised applications and resources.

Rather than automatically trusting a user because they are connected to a particular network, SASE evaluates who they are, how they are connecting and whether they meet defined security requirements.

This approach allows organisations to apply consistent security controls regardless of user location.

Because decisions are based on identity and policy rather than network location, SASE aligns closely with modern Zero Trust principles and supports the needs of distributed organisations.

What Are the Main Components of SASE?

SASE combines several networking and security capabilities within a single architecture.

SD-WAN

SD-WAN helps organisations optimise connectivity between users, locations and cloud applications. It improves traffic routing and supports application performance across distributed environments. Learn more about Viatel’s SD-WAN solutions here .

Zero Trust Network Access (ZTNA)

ZTNA grants access based on identity, context and policy rather than implicit trust. Users only receive access to authorised applications and resources.

Secure Web Gateway (SWG)

A Secure Web Gateway helps protect users from web-based threats while enforcing internet access policies and security controls.

Cloud Access Security Broker (CASB)

CASB solutions provide visibility into cloud application usage and help organisations apply security policies consistently across cloud environments.

Firewall-as-a-Service (FWaaS)

FWaaS delivers firewall capabilities through a cloud-based service model, helping organisations apply security controls without relying solely on traditional on-premises infrastructure.

Together, these technologies create a foundation for modern SASE network security and support wider cybersecurity strategies.

What Are the Business Benefits of SASE?

For most organisations, the value of SASE lies in the business outcomes it can support rather than the technology itself, including stronger data protection across users, applications and locations.

Simplified Security & Networking

Bringing networking and security capabilities together can reduce reliance on disconnected tools and simplify day-to-day management.

Consistent Security

Security policies can be applied consistently across users, devices and locations rather than depending solely on a traditional network perimeter.

Support for Hybrid Work

Employees can securely access business resources regardless of where they work, helping organisations support flexible working models.

Greater Visibility and Control

Centralising networking and security functions can provide IT teams with improved visibility across distributed environments.

Scalability

A cloud-delivered architecture can better support changing business requirements, growing user numbers and increased application demand.

For many organisations, these benefits contribute to stronger cyber resilience, improved governance and a more streamlined approach to managing network and security operations.

What Is the Difference Between SASE & SD-WAN?

SASE and SD-WAN are not competing technologies.

SD-WAN focuses primarily on connectivity and traffic optimisation. SASE builds on these capabilities by adding integrated security services such as ZTNA, SWG, CASB and FWaaS.

The key message is simple: SD-WAN and SASE are complementary technologies. SD-WAN can form part of a broader SASE architecture.

How Does Zero Trust Fit Into SASE?

Zero Trust and SASE are closely connected concepts.

A Zero Trust approach assumes that no user, device or application should automatically be trusted. Every access request must be validated based on security policies, identity and contextual information.

SASE supports this approach through:

• Identity-aware access controls
• Device verification
• Context-based decision making
• Policy-driven access management

Rather than making decisions based solely on network location, access is granted according to defined security policies.

This can help organisations improve control over applications and data while supporting remote users, contractors and distributed teams.

When Should a Business Consider SASE?

There is no single trigger for adopting SASE. However, many organisations begin exploring it when they experience increasing complexity across networking and security environments.

SASE Readiness Checklist

• Employees regularly work remotely or across multiple locations
• Cloud applications have become central to operations
• The business operates multiple branches or offices
• Networking and security are managed through numerous separate tools
• IT teams need more consistent security policies
• The organisation is developing a Zero Trust strategy

If several of these points apply, it may be worthwhile assessing whether a more integrated approach could support future business requirements.

Many organisations begin with an assessment of their current environment to identify gaps, overlaps and opportunities for improvement.

SASE can be introduced in phases rather than through a single transformation programme. Organisations may begin with priorities such as SD-WAN, secure remote access or cloud security, then bring these capabilities together over time as part of a wider SASE architecture.

How Viatel Can Support SASE Strategy

Moving towards SASE is not simply about implementing new technology. It requires an understanding of existing infrastructure, business priorities and security requirements.

Viatel’s SASE expertise was recognised with the 2026 SASE Partner of the Year award at the Palo Alto Networks Partner Awards, reflecting the team’s experience in helping customers secure users, applications and data across distributed environments.

Viatel can support organisations by:

• Assessing existing network and security environments
• Identifying gaps and requirements
• Bringing networking and security considerations together
• Supporting secure cloud integration
• Helping build more secure and scalable infrastructure

By taking a holistic view of networking, cloud and cybersecurity requirements, organisations can develop a roadmap that supports both current operations and future growth. Explore Viatel’s enterprise cybersecurity solutions to build a more integrated approach to protecting your people, systems and data.

 

Take the Next Step Towards Secure, Scalable Access

As users, applications and data become increasingly distributed, businesses need an approach to security that extends beyond the traditional network perimeter.

Reviewing how users access applications, where security policies are enforced and whether networking and security tools are operating efficiently can provide a useful starting point.

Talk to Viatel about how SASE can help your organisation bring networking and security together while delivering secure access across users, applications and locations.