Which Network Access Protection (NAP) enforcement method should you implement?

Your network contains an Active Directory domain named contoso.com. The domain
contains three VLANs. The VLANs are configured as shown in the following table.
All client computers run either Windows 7 or Windows 8.
The corporate security policy states that all of the client computers must have the latest
security updates installed.
You need to implement a solution to ensure that only the client computers that have all of the
required security updates installed can connect to VLAN 1. The solution must ensure that all
other client computers connect to VLAN 3.
Which Network Access Protection (NAP) enforcement method should you implement?

A.
VPN

B.
DHCP

C.
IPsec

D.
802.1x

Explanation:
http://blogs.technet.com/b/wincat/archive/2008/08/19/network-access-protection-using-802-
1x-vlan-s-orportacls-which-is-right-for-you.aspx
The most common method of the list is 802.1x for a variety of reasons. First, the industry has
been selling 802.1x network authentication for the last 10 years. 1x gained tremendous

popularity as wireless networking became prevalent in the late 90’s and early 2000’s and has
been proven to be a viable solution to identifying assets and users on your network. For
customers that have invested in 802.1x capable switches and access points, NAP can very
easily be implemented to complement what is already in place. The Network Policy Server
(NPS) role
Windows Server 2008 has been dramatically improved to make 802.1x policy creation much
simpler to do.