Description of the illustration jnditreesame.gif

This graphic show four pentagons, labeled A (top left), B (top right), C (bottom right), and D (bottom left). Each pentagon contains a box labeled "Object X" and "A, C." In the middle of the graphic, surrounded by the pentagons, is an oval labeled "IP Unicast." An arrow points from pentagon A to the oval. An arrow points from the oval to pentagon B. An arrow points from the oval to pentagon C. An arrow points from the oval to pentagon D.