Ajax is a Technology through which we can create the Asynchronous Communication with the Server.
Ajax uses the XMLHttpRequest object created by the browser itself.
AJAX Framework is used for creating web applications with a dynamic link between client and server.
Few client side AJAX frameworks are-
Angular js and many more.
Frameworks that supports for server side AJAX apps are-
JBOSS Rich Faces
Form Engine and many more.
By this question they must ensure
-Their understanding with respect to different Web application technologies
-AJAX is not a new One It does the same functionality which activeX does in DotNet.