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Survey the Network

4-4 Design Planning

FortheinlineimplementationoftheEnterasysNACsolution,theNACControllerauthenticates

andauthorizesend‐systemslocallyontheappliance,anddoesnotrelyonthecapabilitiesof

downstreaminfrastructuredevices.Becauseofthis,theNACControllercanbeutilizedin

networkswherenon‐intelligentand/orintelligentinfrastructuredevicesexist

attheedgeofthe

network.Ifthenetworkdoesnothaveanintelligentedge,thentheNACControllermustbe

deployedinordertoprovidetheauthenticationandauthorizationcapabilitiesrequiredfor

implementingnetworkaccesscontrol,asshowninFigure 4‐2.

Figure 4-2 Network with Non-Intelligent Edge

2. Evaluate Policy/VLAN and Authentication Configuration

Foranetworkwithanintelligentedge,thesecondstepinsurveyingyournetworkistoevaluate

thenetworkauthenticationmethodcurrentlybeingused,andhowthedeploymentofEnterasys

NACwillaffectit.Anetworkwithanintelligentedgecanbeclassifiedintooneoftwocases:either

authenticationis

deployedonthenetworkoritisnot.

Case #1: No authentication method is deployed on the network.

Ifauthenticationisnotconfiguredonthenetwork,out‐of‐bandNACcanbedeployedwith

minimalconfigurationbyim plementingMACauthenticationontheintelligentedgeofthe

network(iftheedgeswitchessupportMACauthentication).TheNACGatewaycanbeconfigured

Note: This step is not necessary if in step 1 you determined that the network does not have an

intelligent edge and the inline NAC Controller appliance will be deployed to provide the

authentication and policy enforcement capabilities.

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