15. What happens if one of the stations is unplugged in the ring topology? 16. Draw a hybrid topology with a star backbone and three-ring networks. 17. Draw a hybrid topology with a rine backbone and two bus networks. 18. When a party makes a Iocal telephone call to another party, is this a point-topoint or multipoint conncction? Explain your answer. 19. Compare the telephone network and the Internet. What are the similarities? What are the differences? 20. 15. What happens if one of the stations is unplugged in the ring topology? 16. Draw a hybrid topology with a star backbone and three-ring networks. 17. Draw a hybrid topology with a rine backbone and two bus networks. 18. When a party makes a Iocal telephone call to another party, is this a point-topoint or multipoint conncction? Explain your answer. 19. Compare the telephone network and the Internet. What are the similarities? What are the differences? 20