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