Question $4.$

Another medium access control technique for rings is the slotted ring. A number of fixed$-$

length slots circulate continuously on the ring. Each slot contains a leading bit to designate

the slot as empty or full. A station wishing to transmit waits until an empty slot arrives,

marks the slot full, and inserts a frame of data as the slot goes by$.$ The full slot makes a

complete round trip, to be marked empty again by the station that marked it full. In what

sense are the slotted ring and token ring protocols the complement of each other?