NetworkAccess Control (NAC) is an application that employs a specified setof protocols to specify and enforce a policy that describes how toprotect access to various computer systems by unauthorized users whenthey first try to access the network. In simple terms, it is anaccess control technology that controls access on networks using afirewall or anti-virus protection. It is typically implemented in aprivate or intranet network. In more complex terms, it can beimplemented as a comprehensive security solution for the entirenetwork infrastructure.
Themost common devices to use in a private or intranet networkaccess control implementation are routers and edge routers.Moreover, there are also security devices such as intrusion detectiondevices and firewalls. These devices are used to restrict and preventaccess from unauthorized sites. There are several reasons why acompany would want to implement this type of security policy in theirnetwork infrastructure. For starters, it is important to set up asystem that will allow for the collection and recording ofinformation about all of the computers in the organization. Thisinformation can then be used for purposes such as incident response,training purposes, or for any other purposes that are defined by theadministrator. One example of a technology that is commonly used forensuring the security of a network is the endpoint security device.
Furthermore,some companies choose to install network access control solutionsthrough the use of what is known as the patch management device. Apatch management device is a software program that provides updatesto the most recent definitions of security controls, such as thoseprovided by the firewall. These programs are typically installed onindividual computers within the organization and are used to scan allcomputers on a network for potential vulnerabilities. Once thesevulnerabilities have been identified, the patch management programwill then try to download and install the latest patch available.Once this has been done, the device will then disconnect from thenetwork, allowing the application to continue running while anysecurity-related issues are resolved. Recently, in September 2018,Fortinet launched a new network access control solution for IoTsecurity to offer a response to threats.
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