Cisco 8821 Manual page 155

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On the Select Server Role page, select the Active Directory Certificate Services role, then click Next.
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Add the Network Device Enrollment Service role service.
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In the Add Roles Wizard, on the Select Role Services page, select the Network Device Enrollment Service check
box, then click Next.
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The wizard will detect whether all the required dependencies are installed. If any dependencies are missing, you will be
prompted with a dialog box explaining what is missing and requesting your permission to install the dependencies.
Click Yes to continue the installation.
Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
155