Any number of actions could be applied. At the wishy-washy end, you could grant network access with a warning. Or maybe before allowing the consultant to connect, you have him sign a guest agreement in which he states that his laptop has up-to-date security protection. What's important is deciding up front.
PLAYS WELL WITH OTHERS?
Integration programs are popping up like mushrooms, but the number of products supported by NAC systems varies widely. Big vendors like Cisco and Microsoft boast 80 or more partners. Chances are, if your company uses common antivirus, authentication, and intrusion detection applications as well as management programs for computer configuration and patch management, they'll be supported by mainstream NAC products. Still, take the time to check and examine your plans to be sure the NAC vendor will support your choices going forward. Exceptions are not only costly to deal with, they can lead to coverage gaps.
Lining up your existing network equipment against the multiple assessment and enforcement methods a NAC product has available to support your policies is also critical. For example, while 802.1X is a robust and secure enforcement method, some infrastructure gear doesn't support 802.1X and can't be upgraded. An alternate enforcement plan will be needed until new switches are in the cards.
If you lay the groundwork by tailoring your policy requirements to what you're trying to accomplish with NAC and pair that with your existing and planned network infrastructure, your purchase and deployment will be far less stressful.
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