What is NAC (Network Access Control)?

NAC (Network Access Control) is a technology that controls which users and devices can connect to a network. NAC enforces security policies and can allow, restrict, or deny access. Its purpose is to reduce the risk of unknown, unauthorized, or insecure devices gaining access to an organization's network.

A NAC solution evaluates devices and users attempting to connect to a network. Depending on the solution and its configuration, it can verify identity, identify device types, and assess security posture. It then enforces organizational policies by granting, restricting, or denying access. NAC can also isolate devices that do not meet defined security requirements.

Can NAC prevent personal laptops from accessing a corporate network?

Yes, if the organization's security policies require it. NAC can distinguish between devices that meet access requirements and those that do not. For example, a personal laptop that has not been approved for the internal network can be denied access or directed to a separate guest network. The outcome depends on the configured policies.

Does NAC work on both wired and wireless networks?

Yes. NAC can enforce access policies on both wired and Wi-Fi networks. It can control which users and devices are allowed to connect and assign different levels of network access. The available capabilities depend on the network equipment, NAC solution, and implementation.

What is the difference between NAC and IEEE 802.1X?

NAC is a broader approach to controlling network access. IEEE 802.1X is a standard for port-based network access control that can serve as a technical component of a NAC solution. NAC may also include device visibility, security posture assessment, guest access management, and automated policy enforcement.

How does NAC support Zero Trust?

NAC supports Zero Trust by verifying users and devices before granting network access. This reduces reliance on implicit trust based solely on a device's connection to the corporate network. However, NAC is only one possible security measure within a Zero Trust architecture, which also involves identity-based access control and protection of specific resources.

What is the difference between NAC and ZTNA?

NAC (Network Access Control) primarily determines which users and devices can connect to a network. ZTNA (Zero Trust Network Access) controls access to specific applications and services based on identity and other security conditions. The technologies can complement each other, but they do not perform exactly the same function.

Can NAC detect devices that do not meet security requirements?

Yes. NAC solutions with security posture assessment capabilities can identify devices that do not meet defined requirements. These may include requirements for software updates or security software. Depending on policy, a device can be restricted, isolated, or denied access. Not all NAC solutions offer the same assessment capabilities.

Sicra supports organizations with network architecture, security advisory services, and access control implementation. NAC can be part of a broader security architecture alongside network segmentation and Zero Trust principles. The goal is to give organizations better control over which users and devices can access their networks and reduce risks associated with unauthorized connections.

NAC (Network Access Control)

What is Network Access Control (NAC)?

Network Access Control (NAC) is a security technology that controls which users and devices can connect to a network. NAC enforces an organization's access policies and can allow, restrict, or deny access.

Depending on the solution and its configuration, NAC can verify user and device identities and assess a device's security posture. For example, it may check whether a computer is managed by the organization or meets specific security requirements.

Devices that do not meet these requirements can be blocked or granted restricted access, such as access to a guest network or an isolated network segment.

NAC is used in both wired and wireless networks. It can also support a Zero Trust architecture, but it does not replace other security measures, such as application-specific access controls and network segmentation.

Example

An employee attempts to connect to the corporate network using a personal laptop. The organization requires computers accessing its internal network to be registered and managed by the IT department.

The NAC solution identifies that the laptop does not meet this requirement. Depending on the organization's security policies, it can deny the connection or provide access only to a separate guest network.

Sicra and Network Access Control

Sicra helps organizations assess and implement network access control as part of a comprehensive network architecture. NAC can serve as one of several security measures within a Zero Trust approach, alongside identity management and network segmentation.

Services

SASE architecture

SASE transformation

Sicra SOC - Security Operation Center

Sicra NOC - Network Operation Center

Network architecture

Network transformation

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