05] (25 Marks): Give the reason behind: 1- Star network topology is less expensive than mesh network topology. 2- ATM uses fixed length cells of 53 bytes. 3- Frames are numbered 0, 1 alternatively in stop-and-wait flow and error control. 4. For traditional Ethernet, the maximum length of the network is 5120 m. 5- Fragmentation is done at any intermediate router while defragmentation is done at destination