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Figure 5-12 Path of messages between NAP components.
Direct from the Source: 802.1x and IPsec Enforcement in Network Access Protection
NAP includes a variety of methods for enforcing network policies for both local and remote computers. The two methods most suited for local enforcement on enterprise networks are 802.1x and IPsec. Do not think of these two methods as mutually exclusive options, but rather as complementary technologies that can be combined to provide two powerful layers of defense-in-depth for your network.
Part I:
Windows Security Fundamentals
802.1x is a physical network authentication standard that originally was mostly widely adopted for securing wireless networks. However, most modern, enterprise-class wired network switches also support this technology, which can control who and what can associate with physical ports. NAP can integrate with any standards-compliant, 802.1x-based switch to assign systems to specific VLANs based on their health. For example, you can configure NAP to place all unhealthy computers into a remediation VLAN that only has access to update servers and cannot send traffic to the rest of the network. By using the open 802.1x standard, NAP can provide powerful layer 2 connectivity controls based on system health. Although 802.1x provides valuable security benefits for enterprises, using it alone may not always provide complete, organization-wide protection. This is because 802.1x protection only occurs at the port where a device is connected. After that connection is successfully made, 802.1x provides no further restriction of the client s traffic routing abilities. Thus, if an unhealthy computer is able to connect anywhere on the network where 802.1x is not deployed such as a network printer port exempted from 802.1x enforcement or a branch office that lacks 802.1x compatible hardware that computer will have full connectivity to the rest of the enterprise. In other words, 802.1x is port-level rather than host-level protection. IPsec is another open standard that NAP integrates with. IPsec can complement 802.1x or be deployed on its own. IPsec protection is host-level protection and protects systems on the network regardless of whether an unhealthy system is able to physically associate with a port. IPsec enforcement works by deploying an enterprise-wide IPsec policy to all systems (typically accomplished through Group Policy). This policy configures systems to reject traffic unless the initiator signs the traffic with a certificate issued by a NAP HRA. The HRA integrates with NAP to ensure that only systems that pass an organization s health policy are provisioned with these certificates. Thus, IPsec enforcement provides protection at the host layer and can act as a stand-alone enforcement method or an additional layer of defense-in-depth when combined with 802.1x. IPsec enforcement also has the additional value of being easier to integrate into virtualized environments where virtual machines may not be connected to 802.1x capable ports (either physical ports or those on virtual switches). John Morello, Senior Program Manager Windows Server Division
NAP Scenarios
The following likely NAP scenarios help to illustrate the value of this new platform:
Desktop Computers Desktop computers can pose a threat to the network if they are
missing updates, are configured poorly, or have become infected by malware. Each of
5:
Firewall and Network Access Protection
these situations can allow nefarious individuals to access information that should not leave the organization. Computers might be missing updates because they have been turned off for an extended period of time, or if they were unable to connect to the network for some reason. They could become misconfigured if users have more privileges on their systems than best practices prescribe. They could become infected with malicious software because the user accessed dangerous Web sites or opened files infected with a virus.
Roaming Laptops Although the mobility of laptops has tremendous value, it also
increases the risk of compromise beyond that faced by the typical desktop computer. A laptop can be missing updates or the most recent antivirus signatures because the user has not connected the laptop to the corporate network for several weeks. A laptop faces potential attack when used in wireless networks, or when left unattended in a place accessible by untrustworthy individuals. With NAP, administrators can verify the health state of laptops each time they reconnect to the organization s network, whether via a VPN or when the user returns to the office.
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