======Adding Roles On Windows Server======
====Let's say we want to add the role of DNS Server==== 
  -Open Server Manager or Initial Configuration Tasks
  -Click "Add Roles" under Roles Summary or Customize this Server
  -Click Next button from the Before you Begin page of the Add Roles Wizard
  -For the First Role, let's select the Checkbox for DNS Server
  -Click Next button (Note we are not integrating with Active Directory Domain Services because that role or feature is not installed)
  -under confirmation, select Install button
  -Wait for the progress indicator to complete for the installation of the role of DNS Server
  -Installation Succeeded
  -click the Close Button
  -Even if you are not asked to do so, you should restart the Windows Server.

====Adding Web Server (IIS) Role====
  -You probably need to install some prerequisite features for this Role
  -Under Initial Configuration Tasks, click "Add Roles" under Customize this Server screen
  -Click Next button after the Add Roles Wizard starts
  -Select the checkbox for Web Server (IIS)
  -Click Next button
  -It says Add features required for Web Server (IIS), which include Windows Process Activation Service, and subfeatures for Process Model, and Configuration API's.
  -Click the button for Add Required Features
  -Click Next Button in the Add Roles Wizard
  -Click Next Button under Intro to Web Server (IIS)
  -All the ROLE SERVICES will be shown, including - Static Content, Default Document, Directory Browsing, Http Errors, Http login, Request Monitor, Request Filtering, Static Content Compression, IIS Management Console
  -Click Next Button
  -Under Confirmation screen, review and click Install button
  -Click "Close" Button when progress indicator finishes and the Wizard concludes stating that "Installation Succeeded"
  -It is recommended to restart the Windows Server even if you are not prompted to do so.